Brilliance CT TM

6-slice, 10-slice, 16-slice, and 16 Power

configurations
Versions 1.2, 1.2.1, and 1.2.5

Model: 4535 670 73191, 4535 670 73181, 4535 670 78851, and 4535 670 05721

System Performance Manual

4535 670 87051

Revision F

This document and the information contained in it is proprietary and confidential information of Philips Medical Systems (“Philips”) and may not be
reproduced, copied in whole or in part, adapted, modified, disclosed to others, or disseminated without the prior written permission of the Philips Legal
Department. Use of this document and the information contained in it is strictly reserved for current Philips personnel and Philips customers who have a
current and valid license from Philips for use by the customer’s designated in-house service employee on equipment located at the customer’s designated site.
Use of this document by unauthorized persons is strictly prohibited. Report violation of these requirements to the Philips Legal Department at 22100 Bothell
Everett Highway, Bothell, WA 98021.
This document must be returned to Philips when the user is no longer licensed and in any event upon Philips’ first written request.

Philips Medical Systems © 2005

 Philips Medical Systems
© 2005 KONINKLIJKE PHILIPS ELECTRONICS N. V. ALL RIGHTS RESERVED.

Warranty Disclaimer
PHILIPS PROVIDES THIS DOCUMENT WITHOUT WARRANTY OF ANY KIND, IMPLIED OR EXPRESSED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.

Limitation of Liability
PHILIPS HAS TAKEN CARE TO ENSURE THE ACCURACY OF THIS DOCUMENT. HOWEVER, PHILIPS ASSUMES
NO LIABILITY FOR ERRORS OR OMISSIONS AND RESERVES THE RIGHT TO MAKE CHANGES WITHOUT
FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. PHILIPS
MAY MAKE IMPROVEMENTS OR CHANGES IN THE PRODUCT(S) OR PROGRAM(S) DESCRIBED IN THIS
DOCUMENT AT ANY TIME.
Symbol Descriptions

Attention symbol Radiation warning symbol

Laser warning symbol Biohazard warning symbol

Magnetism warning symbol Projectile warning symbol

Electrical warning symbol Do not touch

Revision History

ECO # Revision Date Comments

A August 31, 2004 New Release
Updated cover and introduction for PPCV Configuration, added tables
B September 30, 2004
for 6-slice and 10-slice configurations, deleted 40-slice references
C February 28, 2005 Added Axial CTDI 100 Air Dose test, updated for Big Bore system
D May 15, 2005 Updated front cover for version 1.2.5, removed PPCV reference
Moved Big Bore performance data to separate manual, added tests for
E June 13, 2005
study cycle times, CT number stability, and infant mode check
F December 20, 2005 Updated Axial Slice Widths Measurement table for 16-slice/16 Power

This document was prepared by the CT PMG Haifa Service Innovation Department.
For any additions, corrections, or suggestions, contact:
CT PMG Haifa Customer Support Department
Email: _1HFA_Support_e2@philips.com
Safety Information
To the User of This Manual
The user of this manual is directed to read and carefully review the instructions, warnings and cautions contained herein prior to
beginning installation or service activities. While you may have previously installed or serviced equipment similar to that described in this
manual, changes in design, manufacture or procedure may have occurred which significantly affect the present installation or service.

Installation and Environment

Except for installations requiring certification by the manufacturer per federal standards, see that a radiation protection survey is made
by a qualified expert in accordance with NCRP 102, section 7, as revised or replaced in the future. Perform a survey after every change
in equipment, workload, or operating conditions which might significantly increase the probability of persons receiving more than the
maximum permissible dose equivalent.

Diagnostic Imaging Systems - Mechanical-electrical Warning

All of the moveable assemblies and parts of this equipment should be operated with care and routinely inspected in accordance with the
manufacturer’s recommendations contained in the equipment manuals.
Only properly trained and qualified personnel should be permitted access to any internal parts. Live electrical terminals are deadly; be
sure line disconnects are opened and other appropriate precautions are taken before opening access doors, removing enclosure panels,
or attaching accessories.
Do not under any circumstances, remove the flexible high tension cables from the x-ray tube housing or high tension generator and/or the
access covers from the generator until the main and auxiliary power supplies have been disconnected. Failure to comply with the above
may result in serious or fatal bodily injuries to the operator or those in the area.

Electrical-grounding Instructions
The equipment must be grounded to an earth ground by a separate conductor. The neutral side of the line is not to be considered the
earth ground. On equipment provided with a line cord, the equipment must be connected to properly grounded, three-pin receptacle. Do
not use a three-to-two pin adapter.

Diagnostic Imaging Systems - Radiation Warning

X-ray and Gamma-rays are dangerous to both operator and others in the vicinity unless established safe exposure procedures are strictly
observed.
The useful and scattered beams can produce serious or fatal bodily injuries to any persons in the surrounding area if used by an
unskilled operator. Adequate precautions must always be taken to avoid exposure to the useful beam, as well as to leakage radiation
from within the source housing or to scattered radiation resulting from the passage of radiation through matter.
Those authorized to operate, participate in or supervise the operation of the equipment must be thoroughly familiar and comply
completely with the current established safe exposure factors and procedures described in publications, such as: Subchapter J of Title 21
 of the Code of Federal Regulations, "Diagnostic X-ray Systems and Their Major Components", and the national council on radiation
protection (NCRP) no. 102, "Medical X-ray And Gamma-ray Protection For Energies Up To 10 Mev-equipment Design and Use", as
revised or replaced in the future.
Those responsible for planning of x-ray and gamma-ray equipment installations must be thoroughly familiar and comply completely with
NCRP no. 49, "Structural Shielding Design and Evaluation For Medical Of X-rays and Gamma-rays of Energies Up to 10 Mev", as revised
and replaced in the future. Failure to observe these warnings may cause serious or fatal bodily injuries to the operator or those in the
area.
Add additional safety information as needed
Only qualified and system trained Philips service staff is allowed to perform service (installation, maintenance, quality assurance) on the
Brilliance CT systems. Make sure that the latest version of the service instructions are available. Read the corresponding instructions
TM

carefully prior to working on the system. For your own safety and for more detailed safety information, refer only to the current version
of the documents.
Use only specified tools and auxiliary materials. After finishing any service activity, ensure that all covers of the Brilliance CT, including
TM

the mylar gasket, are closed

Precautionary Measures Regarding Electrical Voltage

Before you start the procedure outlined in this manual, make sure that you read and understand the warnings listed below.

WARNING PRIOR TO ANY SERVICE AND MAINTENANCE ACTIVITIES INSIDE COMPONENTS:

SWITCH OFF THE SYSTEM AT THE MAIN POWER SUPPLY, (USING THE ON-SITE ON-OFF SWITCH)
AND THE INTERNAL/EXTERNAL UNINTERRUPTIBLE POWER SUPPLY (UPS).
MAKE SURE THAT NO OTHER PERSON CAN SWITCH ON POWER OR SWITCH OFF THE SECURITY
MEASURES, WHEN INSTALLATION, MAINTENANCE OR SERVICE WORK ON THE SYSTEM IS
PERFORMED.

WARNING IN ADDITION TO THE WARNINGS LISTED ABOVE, MAKE SURE TO FOLLOW ALL SAFETY
GUIDELINES AS DESCRIBED IN THE SAFETY CHAPTER OF THIS MANUAL. FAILURE TO DO SO
CAN RESULT IN SEVERE PERSONAL INJURY.

CAUTION Always use an ESD protection wrist strap when servicing any component in the system.
 Contents
Brilliance CT System Performance ......................................................................................1-1
Introduction..........................................................................................................................1-1
Scope ........................................................................................................................... 1-1
Equipment Required..................................................................................................... 1-1
System Test Phantom .........................................................................................................1-2
Brilliance CT System Configuration Geometry And Detection Overview ............................1-5
System Description and Geometry............................................................................... 1-5
Detectors and Detector Module Design........................................................................ 1-5
System Dose Efficiency................................................................................................ 1-5
Prerequisites For Performance Testing...............................................................................1-6
Verification...........................................................................................................................1-6
Performance Tests And Specifications ...............................................................................1-7
Test 1. Peak Tube Potential Check (FDA Test #303) ................................................. 1-7
Test 2. Laser Alignment Check ................................................................................... 1-9
Specification .............................................................................................................1-9
Test 3. Surview (i.e. Scan Projection Radiography) Mode: Scan Accuracy, Image Quality
and Planning Accuracy ......................................................................................... 1-10
Specification ...........................................................................................................1-11
Test 4. Impulse Response and MTF Measurements................................................. 1-12
Test 5. Axial Slice Widths .......................................................................................... 1-16
Test 6. Axial CTDI 100 Air Dose - Standard Head and Body Protocols Procedure .. 1-19
Test 7. Study Cycle Times and CT Number Stability ................................................ 1-21
Test 8. General Image Quality Check (CT Number Accuracy, Artifacts and Image Uni-
formity) .................................................................................................................. 1-23
Allowed Values.......................................................................................................1-23
Test 9. Image Noise (SD) Check............................................................................... 1-30
Test 10. CT Number Linearity Check ........................................................................ 1-33
Test 11. Dose Modulation (DOM) Check................................................................... 1-37
Test 12. Infant Mode Check ...................................................................................... 1-38

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 Contents
Constancy Test Utility .........................................................................................................2-1
Getting Started ....................................................................................................................2-2
Setup ...................................................................................................................................2-3
Acceptance test...................................................................................................................2-5
Constancy test...................................................................................................................2-10
Acceptance Test Indicators ...............................................................................................2-15
Constancy test results ................................................................................................ 2-16
Creating a baseline..................................................................................................... 2-16
Setting the current baseline....................................................................................2-17
Adding an Acceptance Baseline.............................................................................2-17
Adding a Constancy Baseline ................................................................................2-18
Removing a Baseline .............................................................................................2-18
Viewing a baseline .................................................................................................2-19
Showing reports .....................................................................................................2-19
Exporting reports ....................................................................................................2-20

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Brilliance CT System Performance Manual Brilliance CT System Performance

Brilliance CT System Performance

Introduction
This document provides system performance tests, test methods, and performance specifications for the Brilliance
CT 6/10/16-slice and 16 Power. Personnel using this document and performing these tests are expected to be
familiar with CT system test methods and the operation of the Brilliance CT System. A Brilliance CT System
satisfying these performance specifications is a necessary but not sufficient condition for acceptable system
performance and acceptable image quality for system shipment to customers and subsequent clinical use.

Scope
This document applies to all completely assembled and fully calibrated Brilliance CT 6/10/16-slice and 16 Power
Configurations.
NOTE System Performance Data Sheets are available in pdf format on InCenter in the Brilliance CT
Performance Verification Section.

Equipment Required
System Performance Phantom p/n 4550 120 01021
System Calibration Phantom (Eye Phantom) p/n 4550 120 01031
Surview Gauge p/n 4535 671 22551
Laser Alignment Gauge p/n 4535 671 22541

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System Test Phantom

The test phantom used for the majority of these tests is the System Performance Phantom. This phantom is
supplied as part of every Brilliance CT 6/10/16-slice and 16 Power Configurations. The phantom consists of a
combined Head and Body Phantom. The Head Phantom is a 200 mm diameter PVC shell filled with distilled water.
The Head Phantom has three sections (see diagrams below).
Section 1 is called the physics layer and contains objects used for high contrast resolution (thin copper wire) and
slice width (45_ aluminum ramps).
Section 2 is the water layer used for Head HCOR calibration and to measure uniformity and noise.
Section 3 is the Multi-Pin Layer used to measure head mode linearity, contrast scale, and also low contrast
resolution. This section is also used to measure resolution in the standard operating modes.
The Body Phantom part of this phantom consists of a single 300 mm diameter nylon cylinder. Embedded inside this
large nylon cylinder body section is a PTFE (Teflon) pin and a water filled hole. The Body Phantom section is used
for Body HCOR calibration and body mode contrast scale determination.

COPPER WIRE

Section 1
PHYSICS LAYER

Section 2
WATER LAYER HEAD PHANTOM
45

Section 3
MULTI-PIN LAYER

BODY PHANTOM

Figure 1 - 1: Diagram of the System Performance Phantom

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Figure 1 - 2: Cross Section Details of the System Performance Phantom

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Cross Section Details of the System Performance Phantom Composition - Multi-Pin Layer

Pin Number Description

Nylon (Aculon) body with six smaller Lexan pins of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm and 8 mm
1
diameter.
2 Polyethylene
3 Teflon
Perspex with seven rows of holes of different diameters. Each row has five equidistant holes of the
same diameter, as follows:
Row 1 1.00 mm holes, 2.00 mm apart
Row 2 1.25 mm holes, 2.50 mm apart
4 Row 3 1.50 mm holes, 3.00 mm apart
Row 4 1.75 mm holes, 3.50 mm apart
Row 5 2.00 mm holes, 4.00 mm apart
Row 6 2.50 mm holes, 5.00 mm apart
Row 7 3.00 mm holes, 6.00 mm apart
5 Lexan
6 Perspex
Region 7 PVC (shell)

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Brilliance CT System Performance Manual Brilliance CT System Performance

Brilliance CT System Configuration Geometry And Detection Overview

This section contains a brief description of the Brilliance CT 6/10/16-slice and 16 Power Configurations parameters
that are relevant for this service system performance document.

System Description and Geometry

The Brilliance CT 6/10/16-slice and 16 Power Configurations System is a third generation CT scanner. The system
employs pre-patient x-ray beam collimation. The source to detector distance is 104 cm. The source to axis distance
is 57 cm. The gantry aperture opening is 70 cm. The acquisition field of view is 50 cm. The reconstructed field of
view is variable and operator selectable from between 5 and 50 cm. The system normally acquires and displays two
contiguous images per gantry rotation.

Detectors and Detector Module Design

For the 6/10/16-slice and 16 Power Configurations Systems, the detector module contains 672 x 24 solid state
detectors, incorporating Gadolinium Oxy-Sulfide (GOS) scintillators, optical diodes and electronic signal channels,
arranged in 24 side by side arcs, with 672 detectors in each arc. There are sixteen 0.75 mm long individual detector
elements about the center and four 1.5 mm long elements at each end resulting in a 24 mm total detection length, all
lengths referred to the central axis of rotation (COR). An individual detector element will detect more than 98% of the
radiation that falls upon it for the system's 120KVp x-ray spectrum.

System Dose Efficiency

The maximum overall system dose efficiency is approximately 67% in the 16x 1.5 mm collimation mode. This is
achieved as the product of the following components of dose efficiencies:
geometric dose efficiency ≅ 0.76% (XZ Plane).
detector detection efficiency ≅ 98%.
Z-axis radiation efficiency ≅ 90% (in the primary 16 x 1.5 mm collimation mode).

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Prerequisites For Performance Testing

1 All operating software has been installed and Image Calibration and or Image Auto-Calibration has been
successfully completed.
2 The system is fully functional with all hardware and software calibrations complete and performing according to
specification. All covers must be in place and securely attached. All other safety covers or switches must be in
their normal operating positions or states unless specifically changed by a test procedure.
3 The x-ray tube should be warmed up to a nominal tube heat (i.e. 30% ) before commencing testing and all air
calibrations must be current.
4 The Gantry / Detector cooling system must be fully functional and maintaining normal and stable temperatures.
The normal DMS (detector module system) operating temperature is 34 deg C +/- 2 deg C. Before performing
these tests, heat the x-ray tube to 30% anode heat. From Home, select Tube Conditioning > Short TC. Select
Utilities > Misc. > Show Tube Heat to display tube heat. Repeat tube conditioning as necessary to achieve and
maintain 10% to 50% anode heat.

Verification
A permanent record (as a digital file or hard copy data sheet or both) of this documents performance results shall be
recorded and stored. This record shall also be available for reference to appropriate engineering, manufacturing and
service personal via digital archive and/or hard copy.

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Performance Tests And Specifications

Test 1. Peak Tube Potential Check (FDA Test #303)

Procedure:
1 Mount the system phantom off the end of the table using the phantom mounting bracket.
2 Move the table to position the center of the head phantom into the x-ray beam path.
3 Heat the x-ray tube to 30% anode heat. From Home, select Tube Conditioning > Short TC. Select Utilities >
Misc. > Show Tube Heat to display tube heat.
4 Launch Service Tools GUI, select Calibration Tools > Performance Tests. Perform a 90 KV test. Refer to
Figure 1 - 3.

Figure 1 - 3: Performance Tests Display Screen (90 KV Test)

5 Note and record the KV displayed for each of the above exposures in the Performance Tests display screen.
6 Repeat steps 4 and 5 above to get a second measurement for repeatability.
7 Record the measured KV values in the table below and calculate an record the average value for each KV setting
and the difference between the nominal KV and the average measured KV in the table below.

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8 Repeat this scan using the 120 KV and 140 KV settings.

Tube Potential Tube Potential Reading* Average of The Two Difference between the Difference
Readings KV settings and the Ave. Specification
#1 #2 Readings

90 KV +/- 3.6 kV

120 KV +/- 4.8 kV

140 KV +/- 5.6 kV

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Test 2. Laser Alignment Check

1 Mount the system phantom off the end of the table using the
phantom mounting bracket. Check the phantom alignment with a
level. Shim bracket as needed to create a level phantom position.
2 Use the proper gauge plate as shown in Figure 1 - 4, or obtain a
small aluminum gauge plate (approximately 30 mm long, 5 mm
wide and 2mm thick) and tape it (with its long dimension in the
cross-table or x direction) to the top of the phantom over the
center of the body section.
3 Using the external symmetry laser markers, manually adjust the
table position to center the System Phantom with respect to the
laser lines and then position the table horizontally such that the
gauge plate is centered with respect to the external overhead
laser crosshairs. The laser crosshairs should now bisect the
gauge plate in both directions.
4 Push and hold the button that automatically moves the couch
between the symmetry markers and the slice marker. The slice
marker must fall mostly within the gauge plate object. If it does
the automatic couch movement is accurate to within the +/- 2.5
mm specification. Figure 1 - 4: Gauge Plate
5 Center the gauge plate under the slice marker laser, if necessary, make a single axial exposure at this table
position using the following modified Std_Body_QA protocol: 120 kV, 240 mAs, standard collimation mode, 3mm
s.w., contiguous mm table increment, 350 FOV, etc. [the x-ray tube must be warm before making this exposure].
6 The gauge plate should be imaged primarily (more than half) in the first image (i.e. Slice 1).
7 From the image graphics menu, place a Coordinate grid on image 1, 2, 3, and 4 and measure the horizontal and
vertical distance between the center of one image and the horizontal and vertical axes of the grid. The image
center should fall within +/-3 mm of each grid overlay axes (x and y).

Specification
Automatic couch movement accuracy from Symmetry Markers to Slice Marker: plate center to plate center within +/
- 2.5 mm.
Laser Slice Marker Alignment Tolerance: within +/- 1.5 mm of center of the first axial slice.
Laser External Symmetry Markers (horizontal and vertical) Alignment tolerance: +/- 3 mm of axis of rotation or
tomographic image center.

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Test 3. Surview (i.e. Scan Projection Radiography) Mode: Scan Accuracy, Image Quality and
Planning Accuracy
1 Mount the system phantom off the end of the table using the phantom
mounting bracket.
2 Use the proper test gauge, shown in Figure 1 - 5, or fabricate a stainless
steel test gauge or object according to the drawing below (a solid
copper wire may be folded to this shape in a pinch). The z dimension
length must be 150 mm +/- 1.0 mm. The two end wings should be 150 MM TEST GAUGE
approximately 20 mm long. The round diameter should be 1 +/-0.2mm.
Tape one end of this object to the top center of the body phantom with
its length extending in the air above the top center of the system head
phantom.
3 Center the System Phantom using the external symmetry laser lights.
4 Manually move the table into the gantry, so that the Nylon Body Section
of the System Phantom is just past the slice marker laser line. Image the Figure 1 - 5: Test Gauge
nylon body section but not the screw heads.
5 Perform a default PA Body Surview Scan (i.e. 30 or 50 mA and 120 KV) of the entire System Phantom (Head and
Body Phantoms). Increase the mA as needed to image the test gauge thru the body phantom but not above 50
mA. .
6 Visually examine the Surview Image for Image quality as specified below.
7 Using the software "line length measuring tool", carefully measure the length of the 150 mm long test gauge in
the Surview image. The measured length from the image must be accurate to within +/- 1 mm of the true length
as measured with an accurate scale (i.e. 150 +/- 1 mm). Result of line length measurement =
_________________ mm.
8 Carefully plan an axial sequence of 3 mm wide images using the acquisition technique defined below. Start the
plan exactly at one end of the gauge object and stopping just past the other end; as close as possible. You may
have to magnify and then re-center the Surview image in order to accurately plan the scan.
9 Acquire the above plan using the following standard body mode technique: 120KV, 250 mAs, 16 x 1.5 mm, or 10
x 15 mm, or 6 x 1.5 mm collimation mode, 3 mm slice width, contiguous mm increment, etc.
10 The wings or ends of the object should be visible in the first and the 50th image.
11 Repeat the above planning and acquisition procedure in the helical scanning mode using a helical pitch of 0.9,
thickness = 3 mm, increment = contiguous, the number of images are now determined from the helical plan.

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Figure 1 - 6: Test Gauge Shown Mounted on Phantom

Specification
Surview Mode Scan measurement accuracy: +/- 1mm
Image Quality: No unusual streaks or stripes; test gauge visible for planning purposes, phantom details sufficient
for planning scans.
Planned axial slice alignment: +/- 1.5 mm of center of first axial slice (visible in first image and 50th image)
Planned helical slice alignment: +/- 1.5 mm of center of first helical slice (visible in first image one of the last two
images)

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Test 4. Impulse Response and MTF Measurements

1 Using the laser alignment lights, center and align the system phantom on the axis of rotation. Level the phantom
using shims in the holding bracket as needed.
2 Perform a Surview scan of the phantom for planning purposes.
3 Using the Standard_Head and Standard_Body QA protocols with head first -supine positioning. Adjust the FOV
to 100mm as in the table on the next page and the set the Recon Center to Center x(mm) = -40, Center y(mm) =
+24,16/10/6 x 1.5mm collimation mode, 3mm slice width. Acquire axial images of the thin copper wire in the
center of the physics layer of the Head section of the System Phantom for the MTF determination.
Std._Head_QA protocol: 120 kV, 200 mAs, scan angle =360 degrees, resolution = Standard (Head), rotation time
= 1.0 sec, Recon filter EB, 512 x 512 matrix size, number of scans =1, etc.

Std_Body_QA protocol: 120 KV, 240mAs, scan angle =360 degrees, resolution = Standard (Body), rotation time =
0.75 sec, Recon filter B, 512 x 512 matrix size, number of scans =1, etc.

4 Perform the Impulse Response and MTF measurements on selected wire images by activating the Home /
Utilities / Misc / Impulse Response program and then by selecting the above-acquired images to be analyzed
from the image archive disk. Select the central two images from each scan (Head and Body) for analysis.
5 Click on "Curs" to get the impulse response measurement cursor. Place the cursor directly on top of the circular
cross-sectional image of the wire in the selected images. Press the "calculate" button and record the results in
the table on the next page. You may have to read the required MTF values off the MTF graph.
6 Repeat the above in both the HR (High Resolution) and UHR (Ultra- High-Resolution) axial head modes. Adjust
the head protocol as follows: FOV = 100mm and 1024 matrix size as indicated in the table below and Recon
Center set to Center x (mm) = -40, Center y (mm) = +24,the rotation time = 1.5sec; collimation mode 16/10/6 x
0.75mm, slice width = 1.5mm; mAs = 400; scan mode = HR or UHR; recon filter = D for HR and E for UHR. Again
acquire one scan with zero table increment through the center of the thin copper wire in the Head section.

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7 Measure and record the Impulse Response and MTF results as indicated in the Table(s) below for either 6-slice,
10-slice, 16-slice, or 16 Power.

Table 1 - 1: IR and MTF Data Table (6-slice)

Measured Measured
Measured I.R. Specified Specified
Rotation Specified I.R at MTF at 50% MTF at 10%
Scan # Filter FOV (mm) Resolution at 50% (mm) MTF at 50% MTF at 10%
Time (sec) 50% (mm) (lp/cm) Slice (lp/cm) Slice
Slice 1 Slice 2 (lp/cm) (lp/cm)
1 Slice 2 1 Slice 2

Standard
1 EB 100 0.75 1.43 +/- 0.1 2.8 +/- 0.5 5.5 +/- 0.5
(Head)

Standard
2 B 100 0.75 1.25 +/- 0.1 3.3 +/- 0.5 6.5 +/- 0.5
(Body)

100 (1024
3 D High (Head) 1.5 0.72 +/- 0.08 7.5 +/- 0.7 11.5 +/-1.0
matrix)

100 (1024 Ultra-High

4 E 1.5 0.51 +/- 0.08 7.3 +/- 0.8 16.0 +/- 1.0
matrix) (Head)

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Table 1 - 2: IR and MTF Data Table (10-slice)

Measured Measured
Measured I.R. Specified Specified
Rotation Specified I.R at MTF at 50% MTF at 10%
Scan # Filter FOV (mm) Resolution at 50% (mm) MTF at 50% MTF at 10%
Time (sec) 50% (mm) (lp/cm) Slice (lp/cm) Slice
Slice 1 Slice 2 (lp/cm) (lp/cm)
1 Slice 2 1 Slice 2

Standard
1 EB 100 0.75 1.43 +/- 0.1 2.8 +/- 0.5 5.5 +/- 0.5
(Head)

Standard
2 B 100 0.75 1.25 +/- 0.1 3.3 +/- 0.5 6.5 +/- 0.5
(Body)

100 (1024
3 D High (Head) 1.5 0.72 +/- 0.08 7.5 +/- 0.7 11.5 +/-1.0
matrix)

100 (1024 Ultra-High

4 E 1.5 0.51 +/- 0.08 7.3 +/- 0.8 16.0 +/- 1.0
matrix) (Head)

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Table 1 - 3: IR and MTF Data Table (16-slice/16 Power)

Measured Measured
Measured I.R. Specified Specified
Rotation Specified I.R at MTF at 50% MTF at 10%
Scan # Filter FOV (mm) Resolution at 50% (mm) MTF at 50% MTF at 10%
Time (sec) 50% (mm) (lp/cm) Slice (lp/cm) Slice
Slice a Slice b (lp/cm) (lp/cm)
a Slice b a Slice b

Standard
1 EB 100 1 1.43 +/- 0.1 2.8 +/- 0.5 5.5 +/- 0.5
(Head)

Standard
2 B 100 0.75 1.25 +/- 0.1 3.3 +/- 0.5 6.5 +/- 0.5
(Body)

100 (1024
3 D High (Head) 1.5 0.72 +/- 0.08 7.5 +/- 0.7 11.5 +/-1.0
matrix)

100 (1024 Ultra-High

4 E 1.5 0.51 +/- 0.08 7.3 +/- 0.8 16.0 +/- 1.0
matrix) (Head)

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Test 5. Axial Slice Widths

1 Using the laser alignment lights, center and align the system phantom on the axis of rotation. Shim the phantom
holder as needed to insure that phantom axis is perpendicular to the scan plane.
2 Perform a Surview scan of the phantom for planning purposes and plan an axial slice in the middle of the 45
degree slice width ramps. The four rectangles located in the phantom - at 12, 3, 6, and 9 o’clock should locate the
middle of the slice width ramps.
3 Acquire axial scans at the center of the slice width ramps using the following modified standard head protocol:
(120 kV, 200mAs, 0.75 sec rotation time, FOV = 140. Set the resolution mode, filter and nominal slice width
according to the following table(s) for 6-slice, 10-slice, 16-slice, or 16 Power.

Table 1 - 4: Axial Slice Widths Measurement (6-slice)

Collimation Mode Slice 1 -Average Slice 2 - Average Measured S.W.

Resolution / Filter
Slice Thickness FWHM (mm) FWHM (mm) Specification
Standard 4 x 6 mm
B 6.0 mm 6.0 +/- 0.5 mm
Standard 6 x 1.5 mm
Slice 1 Slice 3 Slice 4 Slice 6
C 1.5 mm 1.5 +/- 0.5 mm
Standard 6 x 3 mm
B 3 mm 3 +/- 0.5 mm
HR 6 x 0.75 mm
D 0.75 mm 1.0 +/- 0.5 mm
Standard 4 x 4.5 mm
B 4.5 mm 4.5 +/- 0.5 mm
UHR 2 x 0.6 mm
Slice 1 - Average Slice 2 - Average
E 0.6 mm 0.75 +/- 0.5mm

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Table 1 - 5: Axial Slice Widths Measurement (10-slice).

Collimation Mode Slice 2 -Average Slice 3 - Average Measured S.W.

Resolution / Filter
Slice Thickness FWHM (mm) FWHM (mm) Specification
Standard 8 x 3 mm
B 6.0 mm 6.0 +/- 0.5 mm
Standard 10 x 1.5 mm
Slice 1 Slice 5 Slice 6 Slice 10
C 1.5 mm 1.5 +/- 0.5 mm
Standard 4 x 3 mm
B 3 mm 3 +/- 0.5 mm
Standard 4 x 5 mm
B 4.5 mm 4.5 +/- 0.5 mm
HR 10 x 0.75 mm
D 1.5 mm 1.0 +/- 0.5 mm
UHR 4 x 1.5 mm
E 1.5 mm 1.5 +/- 0.5 mm
UHR 4 x 0.75 mm
E 0.75 mm 1.0 +/- 0.5 mm
UHR 2 x 0.6 mm
Slice 1 - Average Slice 2 - Average
E 0.6 mm 0.75 +/- 0.5mm

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Table 1 - 6: Axial Slice Widths Measurement (16-slice/16 Power).

Collimation Mode Slice 1 -Average Slice 3 - Average Measured S.W.

Resolution / Filter
Slice Thickness FWHM (mm) FWHM (mm) Specification
Standard 16 x 1.5 mm
B 6.0 mm 6.0 +/- 0.5 mm
Standard 16 x 1.5 mm
Slice 1 Slice 8 Slice 9 Slice 16
C 1.5 mm 1.5 +/- 0.5 mm
Standard 4 x 3 mm
B 3 mm 3 +/- 0.5 mm
HR 16 x 0.75 mm
D 0.75 mm 1.0 +/- 0.5 mm
UHR 4 x 1.5 mm
E 1.5 mm 1.5 +/- 0.5 mm
UHR 4 x 0.75 mm
E 0.75 mm 1.0 +/- 0.5 mm
Standard 4 x 4.5 mm
B 4.5 mm 4.5 +/- 0.5 mm
UHR 2 x 0.6 mm
Slice 1 - Average Slice 2 - Average
E 0.6 mm 0.75 +/- 0.5mm

4 Measure the FWHM slice width from the images of the ramps using the Slice Width program found under the
Misc menu. Once in the slice width program is selected, press the open archive icon and select one image for
measurement. Select the image where the aluminum image is approximately centered in the ramp image. Click
the ”vertical ROI” icon on the left tool bar and measure both ramps on the selected image. (If the phantom is level
and the ramps are centered in the slice, the two ramp measurements should give similar results.) Report the
average slice width value for each image on the data sheet.

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Test 6. Axial CTDI 100 Air Dose - Standard Head and Body Protocols Procedure
1 Collect and assemble the radiation meter (Radcal model 9015 or equivalent) with the CT pencil probe ion
chamber.
2 Align the pencil probe along the axis of rotation and centered in the x-ray beam. The probe should extend off the
end of the table so that the radiation can be measured in air without table attenuation or other scatter. You may
need to develop a fixture for holding the probe in this position.
3 Using the following head technique with fused slices, (i.e. Std. Res., 120kV, 100mAs, 0.75 sec rot time, 16 x 1.5
mm collimation mode, 6mm slice width, 0 increment, 4 slices). Make 5 exposures one at a time with zero table
increment, and record the 5 readings on the data sheet.
4 Repeat these 5 exposures at 90 KV and record the readings on the data sheet.
5 Repeat this measurement for the body scan technique of 140 kV, 100mAs, 0.75 sec rot time, 16 x 1.5 mm
collimation mode, 6 mm slice width, 0 increment, 4 slices).
6 Repeat single exposures at the slice widths indicated in rows 6,7, and 8.
7 Calculate the average values and the maximum deviations for the three different techniques and record them in
the data sheet.

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Table 1 - 7: Axial CTDI 100 Air Dose - Standard Head and Body Protocols Procedure Data Sheet

Head Mode Air Radiation Values (Mr.) Body Mode Value (Mr.)
Exposure Number
120 KV Spec 90 KV Spec 140 KV Spec

2
3

470 220 660

Average Value:
±15% ±15% ±15%

% Max Dev. from Ave.

(Max Dev. / Ave. Value) ±5% ±5% ±5%

6 260 120 370

(16 x 0.75 collimation mode) ±15% ±15% ±15%
7 140 65 200
(4 x 1.5 mm collimation mode) ±15% ±20% ±15%

8 100 48 142
(4 x 0.75 mm collimation mode) ±20% ±20% ±15%

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Test 7. Study Cycle Times and CT Number Stability

1 Adjust the tube heat as necessary to between 15 and 30% of capacity.
2 Obtain a relatively long (i.e. 0.5 meter) and approximately 15 to 25 cm diameter water phantom for this timing
test. Top off the phantom with water as necessary to remove any air bubbles that could interfere with the accurate
measurement of the water CT number values.
3 Place this phantom on the tabletop and using the alignment lasers, center the phantom with respect to the gantry
opening. Perform a long body Surview scan of the water phantom (i.e. approx. 500 mm in length).
4 From the Surview image, plan a Standard Body Scan centered on the water phantom as follows: (120KV, 312
mAs, 16 x 1.5mm collimation mode, 6 mm slice thickness, 0.75 rotation time, 24 mm scan increment, minimum
cycle time, 10 scans, 40 axial slices, 500mm fov, standard concurrent recon parameters, 5122 matrix, SP Filter =
Off or No)
5 Using a stopwatch, accurately time the scan initialization time (i.e. from pushing O.K. to "auto scan") and then
time the scan and reconstruction time from activating "auto scan" until the 40th image is displayed on the monitor
(two different timings).
6 Repeat this test for a similar Abdomen helical scan of Pitch 0.9. Change the rotation time to 0.5 sec, the mAs/
slice to 130 with auto or contiguous increment, the slice width to 5 mm, scan length to 200 mm or 40 images,
recon fov to 350mm, Evolving recon, SP Filter = On or Yes, etc. (see note below for accurately timing this helical
reconstruction mode).
7 Using a large central ROI with a diameter of approximately 50% of the water diameter, measure the water CT
numbers of the 40 images of each set and record the average CT number and the maximum CT number
deviation from this average (find the difference between the minimum ct number and the average ct number and
the maximum ct number and the average and record the bigger difference below).

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Results and Specification:

Axial Scan:
Time to initialize scan. ______________ ≤ 20 sec
Time to complete 40 images. ______________ ≤ 40 sec
Average CT Number ______________ 0 ± 10
Maximum CT Number dev from ave. ______________ ±4
Helical Scan:
Time to initialize scan. ______________ ≤ 20 sec
*Time to reconstruct 40 images. ______________ ≤ 40 sec
Average CT Number ______________ 0 ± 10
Maximum CT Number dev from ave. ______________ ±4

* For helical evolving, time only the final full matrix recon time for the 40 images (do not include the Evolving preview
image recon time).

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Test 8. General Image Quality Check (CT Number Accuracy, Artifacts and Image Uniformity)
1 Before performing this test, heat the x-ray tube to 30% anode heat. From Home, select Tube Conditioning >
Short TC. Select Utilities > Misc. > Show Tube Heat to display tube heat.
2 Click Home > Utilities > Diagnostic > Service Parameters. Verify Phantom Calibration = Yes, Image Balance=
Yes.
3 From the Home menu, go to Air Calibration and select and perform All Calibrations.
4 Use the Physics System phantom and perform one scan for each mode according to the tables below for 6-slice,
10-slice, 16-slice, or 16 Power. If a test fails, repeat the test for a second try at passing the test.
5 Look for possible rings or other artifacts according to the next table.
6 Check p in the appropriate column of the table(s) below for 6-slice, 10-slice, 16-slice, or 16 Power if the CT
number for all slices is within the allowed tolerance.
NOTE CT number mean value is measured by a 7,000+/-500 mm2 area round ROI at the center of the Head
images and a 13,000+/-500 mm2 area ROI on the Body images. For Head pins scans, use a central ROI of
1,500 +/- 500 mm2 area to measure the water ct number.
7 For Head only-Check the image CT number uniformity for scans with filter UB by using a 1,000+/-100 mm2 area
ROI in the center and a sliding 1000+/-100 mm2 area ROI to be moved around, but not closer than, 1 cm from the
"bone" or phantom edge. Uniformity within an image should be within +/- 2 CT numbers of central value for the
indicated Head scan below.

Allowed Values
• No rings or bands are allowed on the images. Use a window width of 100 for Head and 150 for Body with the
window centered on the CT number of the material.
• Allowed CT number means that the reference CT value for water (Head protocol) should be zero. Reference CT
Value for Body Aculon (defined as X) should be read from System Phantom CT Calibration Values on System
Phantom CT Calibration Values for each voltage respectively.
• CT number uniformity tolerance is Y +/- 2 CT for Head scans mode with filter UB, where Y is the mean CT
number measured by center ROI in each case.

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NOTE If the CT number is outside the limit, note and record the value and the slice number. Repeat test. It
test fails a second time, perform HCOR calibration. From the Home menu, select Calibration >
Selective Calibration > HCOR Calibration. Then repeat General Image Quality Check test.
NOTE All measurements of CT numbers and STD (noise) should be done on 4 on 1 viewer maximum size
window.

Table 1 - 8: Head QA Head Protocol (Axial), FOV 250 mm, 512 matrix, 360 degree scan angle, System Head Phantom Aligned
and Centered, Window Center 0 (zero), Window Width = 100 (6-slice)

CHECK BOX IF CT FOR

SCAN PARAMETERS KILOVOLT, COLLIMATION
SCAN # PHANTOM ALL SLICES IS OK OR ALLOWED CT NO.
(SW), RESOLUTION, ROT. TIME, mAs, FILTER
ENTER THE NUMBER

1 Head Water 120kV, 4x6 (SW 6mm), STD, 0.75s, 300 mAs, EB 0 +/- 4
2 Head Water 120kV, 4x4.5 (SW 4.5mm), STD, 1.5s, 440 mAs, UC 0 +/- 4

0 +/- 4
120kV, 6x3 (SW 6mm), STD, 1.0s, 330 mAs, UB 420
3 Head Water Uniformity Within
degree scan angle
Images (Y +/- 2)

5 Head Pins 120kV, 6x0.75 (SW 0.75mm), High, 1.0s, 300 mAs, C 0 +/- 10

6 Head Water 90kV, 6x3 (SW 6mm), STD, 1.0s, 250 mAs, EB 0 +/- 4

7 Head Water 140kV, 6x3 (SW 6mm), STD, 0.75s, 300 mAs, UC 0 +/- 7

Copy the Reference CT Values for Body Aculon (defined as X) from the System Phantom Label of the System
Phantom used for this test in the table below. If these reference values are not available for this system or out of
date, then re-measure the X values using the CT Linearity Check protocol (Test 10) and record below.

KV X
Body Aculon 140 kV
Body Aculon 120 kV
Body Aculon 90 kV

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Table 1 - 9: QA Body Protocol (Axial), FOV 350 mm, 512 matrix, System Body Phantom Aligned and Centered,
Window Center = X. Window Width =150 (6-slice)
CHECK p IF CT FOR ALL
SCAN PARAMETERS KILOVOLT, SW, ALLOWED CT
SCAN # PHANTOM SLICES ARE OK OR ENTER
RESOLUTION, ROT.TIME, mAs, FILTER NO.
THE NUMBER
1 Body 120kV, 4x6 (SW 6mm), STD, 0.75s, 300 mAs, B X +/- 4
2 Body 120kV, 6x0.75 (SW 0.75mm), STD, 1.0s, 325 mAs, B X +/- 6
3 Body 90kV, 6x1.5 (SW 1.5mm), STD, 1.0s, 350 mAs, B X +/- 6
120kV, 6x0.75 (SW 1.5mm), U-fast, 0.42s, 165 mAs,
4 Body X +/- 6
B
5 Body 120kV, 6x1.5 (SW 1.5mm), STD, 0.5s, 200 mAs, B X +/- 6
6 Body 120kV, 6x0.75 (SW 0.75mm), High, 2.0s, 350 mAs, B X +/- 8
7 Body 140kV, 6x1.5 (SW 1.5mm), High, 1.0s, 250 mAs, B X +/- 8
120kV, 6x0.75 (SW 0.75mm), UF detail, 0.42s, 135
8 Body X +/- 8
mAs, B, (FOV = 250 mm)
Helical Abdomen Scan, 120kV, 6x3 (SW 5mm), STD, Evaluate two images
9 Body X +/- 8
0.5s, 200 mAs, pitch=0.9, Filter=B, SP Filter=yes centered in the body section
SURVIEW SCAN, 500 MM LENGTH
120kV, 50 mA, Scan angle 180 deg -- Check OK if no
Head and vertical and horizontal lines appear on the image and
10
Body the phantom details are clearly visible for planning
purposes.

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Table 1 - 10: Head QA Head Protocol (Axial), FOV 250 mm, 512 matrix, 360 degree scan angle, System Head Phantom
Aligned and Centered, Window Center 0 (zero), Window Width = 100 (10-slice)

CHECK BOX IF CT FOR

SCAN PARAMETERS KILOVOLT, COLLIMATION
SCAN # PHANTOM ALL SLICES IS OK OR ALLOWED CT NO.
(SW), RESOLUTION, ROT. TIME, mAs, FILTER
ENTER THE NUMBER

1 Head Water 120kV, 8x3 (SW 6mm), STD, 0.75s, 300 mAs, EB 0 +/- 4

2 Head Water 120kV, 4x4.5 (SW 6mm), STD, 1.5s, 440 mAs, UC 0 +/- 4
0 +/- 4
120kV, 4x3 (SW 3mm), STD, 1.0s, 330 mAs, UB 420
3 Head Water Uniformity Within
degree scan angle
Images (Y +/- 2)
4 Head Pins 120kV, 10x0.75 (SW 0.75mm), U-high, 1.5s, 400 mAs, D 0 +/- 10

5 Head Pins 120kV, 10x0.75 (SW 0.75mm), High, 1.0s, 300 mAs, C 0 +/- 10

6 Head Water 90kV, 8x3 (SW 6mm), STD, 1.0s, 250 mAs, EB 0 +/- 4
7 Head Water 140kV, 8x3 (SW 6mm), STD, 0.75s, 300 mAs, UC 0 +/- 4

Copy the Reference CT Values for Body Aculon (defined as X) from the System Phantom Label of the System
Phantom used for this test in the table below. If these reference values are not available for this system or out of
date, then re-measure the X values using the CT Linearity Check protocol (Test 10) and record below.

KV X
Body Aculon 140 kV
Body Aculon 120 kV
Body Aculon 90 kV

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Table 1 - 11: QA Body Protocol (Axial), FOV 350 mm, 512 matrix, System Body Phantom Aligned and Centered,
Window Center = X. Window Width =150 (10-slice)
CHECK p IF CT FOR ALL
SCAN PARAMETERS KILOVOLT, SW, ALLOWED CT
SCAN # PHANTOM SLICES ARE OK OR ENTER
RESOLUTION, ROT.TIME, mAs, FILTER NO.
THE NUMBER
1 Body 120kV, 8x3 (SW 6mm), STD, 0.75s, 300 mAs, B X +/- 4
2 Body 120kV, 10x0.75 (SW 0.75mm), STD, 1.0s, 325 mAs, B X +/- 6
3 Body 90kV, 10x1.5 (SW 1.5mm), STD, 1.0s, 350 mAs, B X +/- 6
120kV, 10x0.75 (SW 1.5mm), U-fast, 0.42s, 165 mAs,
4 Body X +/- 6
B
5 Body 120kV, 10x1.5 (SW 1.5mm), STD, 0.5s, 200 mAs, B X +/- 6
6 Body 120kV, 10x0.75 (SW 0.75mm), High, 2.0s, 350 mAs, B X +/- 8
7 Body 140kV, 10x1.5 (SW 1.5mm), High, 1.0s, 250 mAs, B X +/- 8
120kV, 10x0.75 (SW 0.75mm), UF detail, 0.42s, 135
8 Body X +/- 8
mAs, B, (FOV = 250 mm)
Helical Abdomen Scan, 120kV, 10x1.5 (SW 5mm),
Evaluate two images
9 Body STD, 0.5s, 200 mAs, pitch=0.9, Filter=B, SP X +/- 8
centered in the body section
Filter=yes
SURVIEW SCAN, 500 MM LENGTH
120kV, 50 mA, Scan angle 180 deg -- Check OK if no
Head and vertical and horizontal lines appear on the image and
10
Body the phantom details are clearly visible for planning
purposes.

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Table 1 - 12: Head QA Head Protocol (Axial), FOV 250 mm, 512 matrix, 360 degree scan angle, System Head Phantom
Aligned and Centered, Window Center 0 (zero), Window Width = 100 (16-slice, 16 Power)

CHECK BOX IF CT FOR

SCAN PARAMETERS KILOVOLT, COLLIMATION
SCAN # PHANTOM ALL SLICES IS OK OR ALLOWED CT NO.
(SW), RESOLUTION, ROT. TIME, mAs, FILTER
ENTER THE NUMBER

1 Head Water 120kV, 16x1.5 (SW 6mm), STD, 0.75s, 300 mAs, EB 0 +/- 4

2 Head Water 120kV, 16x1.5 (SW 6mm), STD, 1.5s, 440 mAs, UC 0 +/- 4

0 +/- 4
120kV, 16x1.5 (SW 6mm), STD, 1.0s, 330 mAs, UB 420
3 Head Water Uniformity Within
degree scan angle
Images (Y +/- 2)

4 Head Pins 120kV, 16x0.75 (SW 0.75mm), U-high, 1.5s, 400 mAs, D 0 +/- 10
5 Head Pins 120kV, 16x0.75 (SW 0.75mm), High, 1.0s, 300 mAs, C 0 +/- 10

6 Head Water 90kV, 16x1.5 (SW 6mm), STD, 1.0s, 250 mAs, EB 0 +/- 4

7 Head Water 140kV, 16x1.5 (SW 6mm), STD, 0.75s, 300 mAs, UC 0 +/- 4

Copy the Reference CT Values for Body Aculon (defined as X) from the System Phantom Label of the System
Phantom used for this test in the table below. If these reference values are not available for this system or out of
date, then re-measure the X values using the CT Linearity Check protocol (Test 10) and record below.

KV X
Body Aculon 140 kV
Body Aculon 120 kV
Body Aculon 90 kV

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Table 1 - 13: QA Body Protocol (Axial), FOV 350 mm, 512 matrix, System Body Phantom Aligned and Centered,
Window Center = X. Window Width =150 (16-slice, 16 Power)
CHECK p IF CT FOR ALL
SCAN PARAMETERS KILOVOLT, SW, ALLOWED CT
SCAN # PHANTOM SLICES ARE OK OR ENTER
RESOLUTION, ROT.TIME, mAs, FILTER NO.
THE NUMBER
1 Body 120kV, 16x1.5 (SW 6mm), STD, 0.75s, 300 mAs, B X +/- 4
2 Body 120kV, 16x0.75 (SW 0.75mm), STD, 1.0s, 325 mAs, B X +/- 6
3 Body 90kV, 16x1.5 (SW 1.5mm), STD, 1.0s, 350 mAs, B X +/- 6
120kV, 16x0.75 (SW 1.5mm), U-fast, 0.42s, 205 mAs,
4 Body X +/- 6
B
5 Body 120kV, 16x1.5 (SW 1.5mm), STD, 0.5s, 245 mAs, B X +/- 6
6 Body 120kV, 16x0.75 (SW 0.75mm), High, 2.0s, 350 mAs, B X +/- 8
7 Body 140kV, 16x1.5 (SW 1.5mm), High, 1.0s, 250 mAs, B X +/- 8
120kV, 16x0.75 (SW 0.75mm), UF detail, 0.42s, 135
8 Body X +/- 8
mAs, B, (FOV = 250 mm)
Helical Abdomen Scan, 120kV, 16x1.5 (SW 5mm),
Evaluate two images
9 Body STD, 0.5s, 400 mAs, pitch=0.9, Filter=B, SP X +/- 8
centered in the body section
Filter=yes
SURVIEW SCAN, 500 MM LENGTH
120kV, 50 mA, Scan angle 180 deg -- Check OK if no
Head and vertical and horizontal lines appear on the image and
10
Body the phantom details are clearly visible for planning
purposes.

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Test 9. Image Noise (SD) Check

1 Center and align the System Phantom within the axis of rotation and scan the water layer for Head and the
aculon layer for Body.
2 Place a 7,000 ±500 mm2 area ROI at the center of the resulting Head images and a 13,000 ±500 mm2 area ROI
on the Body images. Enter the SD average value corresponding to two scans into Image Noise (SD).
3 All measurements of CT numbers and SD (noise) should be done on 4 on 1 viewer (four images on screen)
maximum size window and with Phantom Calibration and Image Balance switches=Yes.
Table 1 - 14: Image Noise (SD) Measurement Table (6-slice)
SCAN PARAMETERS ALLOWED SD
MEASURED SD X 103
FOV, KILOVOLT, COLLIMATION X 103
SCAN # PHANTOM
(SW), RESOLUTION, ROT. TIME,
FIRST 2 OR 3 3 OR 4 LAST MIN MAX
MAS, FILTER
FOV 250, 120kV, 4x6 (SW 6mm), STD,
1 Head 4.0 4.9
0.75s, 200 mAs, EB
FOV 250, 120 kV, 6x3, (SW 3mm),
2 Head 5.4 6.6
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 6x1.5 (SW 1.5mm),
3 Head 7.5 9.1
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 6x0.75 (SW
4 Head 9.9 12.1
0.75mm), STD, 0.75s, 200 mAs, EB
FOV 350, 120 kV, 6x3 (SW 6mm),
5 Body 11.3 13.8
STD, 0.75s, 200 mAs, B
FOV 350, 140 kV, 4x6 (SW 6mm),
6 Body 9.2 11.3
STD, 0.75s, 200 mAs, B

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Table 1 - 15: Image Noise (SD) Measurement Table (10-slice)

SCAN PARAMETERS ALLOWED SD
MEASURED SD X 103
FOV, KILOVOLT, COLLIMATION X 103
SCAN # PHANTOM
(SW), RESOLUTION, ROT. TIME,
FIRST 2 OR 5 3 OR 6 LAST MIN MAX
MAS, FILTER
FOV 250, 120kV, 8x3 (SW 6mm), STD,
1 Head 4.0 4.9
0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x3, (SW 3mm),
2 Head 5.4 6.6
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x1.5 (SW 1.5mm),
3 Head 7.5 9.1
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x0.75 (SW
4 Head 9.9 12.1
0.75mm), STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 10x1.5 (SW 1.5mm),
5 Head 7.5 9.1
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 10x0.75 (SW
6 Head 9.9 12.1
0.75mm), STD, 0.75s, 200 mAs, EB
FOV 350, 120 kV, 8x3 (SW 6mm),
7 Body 11.3 13.8
STD, 0.75s, 200 mAs, B
FOV 350, 140 kV, 8x3 (SW 6mm),
8 Body 9.2 11.3
STD, 0.75s, 200 mAs, B

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Table 1 - 16: Image Noise (SD) Measurement Table (16-slice, 16 Power)

SCAN PARAMETERS ALLOWED SD
MEASURED SD X 103
FOV, KILOVOLT, COLLIMATION X 103
SCAN # PHANTOM
(SW), RESOLUTION, ROT. TIME,
FIRST 2 OR 8 3 OR 9 LAST MIN MAX
MAS, FILTER
FOV 250, 120kV, 16x1.5 (SW 6mm),
1 Head 4.0 4.9
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x3, (SW 3mm),
2 Head 5.4 6.6
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x1.5 (SW 1.5mm),
3 Head 7.5 9.1
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 4x0.75 (SW
4 Head 9.9 12.1
0.75mm), STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 16x1.5 (SW 1.5mm),
5 Head 7.5 9.1
STD, 0.75s, 200 mAs, EB
FOV 250, 120 kV, 16x0.75 (SW
6 Head 9.9 12.1
0.75mm), STD, 0.75s, 200 mAs, EB
FOV 350, 120 kV, 8x3 (SW 6mm),
7 Body 11.3 13.8
STD, 0.75s, 200 mAs, B
FOV 350, 140 kV, 8x3 (SW 6mm),
8 Body 9.2 11.3
STD, 0.75s, 200 mAs, B

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Test 10. CT Number Linearity Check

The following tests are done on the System Phantom supplied with the scanner aligned in the center. Make sure that
the Water CT number is zero on both Head and Body sections.
Scan according to the following protocols:
NOTE CT number mean value is measured by a 7,000 ± 500 mm2 area round ROI at the center of the Head
water images and a 13,000 ± 500 mm2 area ROI on the Body images.There are fluctuations in the CT
numbers between different batches of the same plastic material. Therefore, the tolerance here is larger
than specified in the Operation Manual. The numbers measured in the field (according to the manual)
are compared with the correct values defined in this test and noted on the Phantom Label.
Use two inner slices and measure the CT numbers of the pins and of the phantom material. Average the values from
the two measured slices. Fill in the Phantom Label on the System Phantom with these CT Phantom calibration
values.
Note all the kV measurement values for the Body entry on the label. Refer to Figure 1 - 7 for pin locations in the
system phantom.
Use a ROI centered on the pin with radius half the diameter of the pin being measured.

Table 1 - 17: CT Linearity Check (6-slice)

SCAN PARAMETERS: FOV, KILOVOLT, COLLIMATION (SW), RESOLUTION,

SCAN # PHANTOM
ROT. TIME, MAS, FILTER

1 Head Pins FOV 250, 120 kV, 6x3 (SW 3mm), STD, 0.75s, 200 mAs, EB

2 Body FOV 350, 140 kV, 6x3 (SW 3mm), STD, 0.75s, 200 mAs, B

3 Body FOV 350, 120 kV, 6x3 (SW 3mm), STD, 0.75s, 200 mAs, B

4 Body FOV 350, 90 kV, 6x3 (SW 3mm), STD, 0.75s, 200 mAs, B

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Brilliance CT System Performance Manual Brilliance CT System Performance

Table 1 - 18: CT Linearity Check (10-slice)

SCAN PARAMETERS: FOV, KILOVOLT, COLLIMATION (SW), RESOLUTION,

SCAN # PHANTOM
ROT. TIME, MAS, FILTER

1 Head Pins FOV 250, 120 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, EB
2 Body FOV 350, 140 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

3 Body FOV 350, 120 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

4 Body FOV 350, 90 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

Table 1 - 19: CT Linearity Check (16-slice, 16 Power)

SCAN PARAMETERS: FOV, KILOVOLT, COLLIMATION (SW), RESOLUTION,

SCAN # PHANTOM
ROT. TIME, MAS, FILTER

1 Head Pins FOV 250, 120 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, EB
2 Body FOV 350, 140 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

3 Body FOV 350, 120 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

4 Body FOV 350, 90 kV, 4x3 (SW 3mm), STD, 0.75s, 200 mAs, B

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Brilliance CT System Performance Manual Brilliance CT System Performance

Nylon (Aculon)
Lexan Nylon (Aculon) Polyethylene

Acrylic (Plexi) Water Teflon

Water Teflon

Figure 1 - 7: System Phantom and Body Phantom

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Brilliance CT System Performance Manual Brilliance CT System Performance

Table 1 - 20: System Phantom CT Calibration Values

Pin Material Specification Head Body

Water 120 kV 0±4

Polyethylene -75 ± 15 N/A

Nylon (Aculon)

Head 120kV 100 ± 15 N/A

Body 140 kV 106 ± 15 N/A

Body 120 kV 100 ± 15 N/A

Body 90 kV 85 ± 15 N/A

Lexan 120 kV 116 ± 15 N/A

Acrylic (Plexiglas) 120 kV 140 ± 15 N/A

Teflon

Head 120kV 1016 ± 50 N/A

Body 140 kV 900 ± 50 N/A

Body 120 kV 920 ± 50 N/A

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Brilliance CT System Performance Manual Brilliance CT System Performance

Test 11. Dose Modulation (DOM) Check

1 Install and align the eye shape Calibration phantom and move the bed up to its maximum limit.
2 Using the slice laser marker, align the phantom in z-direction to scan in the middle of the full section.
3 Use one of the spiral protocols for body and perform a scan with the following parameters: For example, select
"Abdomen / Average Abdomen".
Scan Length 50 mm, Standard Resolution, Collimation 8x3 or 6x3, SW 5 mm, Pitch 0.66, 0.5 sec, 120 kV, 100 mAs,
increment 2.5 mm, FOV 500 mm, Filter B, DOM = Yes, Check all other parameters, and set to No.
Check the mAs on the appearing images. The mAs values should gradually decrease from the first appearing image
to the last. Write down the mAs values of the first and last images in the table below and verify that the values are
within the required limits. In order to see the mAs value, use a single-image screen.
Using a large image centered elliptical ROI, measure the ROI standard deviation in the first and last image and
record below (ROI area = 22,000 ± 2000 for first image and 10,000 ± 1000 for last image).

DISPLAYED mAs ROI STD. DEV.DOM ON ROI STD. DEV.DOM OFF

First Image Measurements

Last Image Measurements

4 Repeat the above scan with DOM = No (Turn DOM off)

5 Using the same large ROI as above, measure the image Std. Deviation with DOM Off and record the results in
the above table. Calculate and Record the % Standard Deviation difference below.

DOM Check Standard Deviation Difference

mAs Specification % Standard Deviation Difference Calculated Specification

First Image 80 +/- 8 ≤ 20%

Last Image 60 +/- 6 ≤ 20%

% Standard Deviation Difference = 100 x (S.D. DOM On - S.D. DOM Off) / (S.D. DOM Off)

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Brilliance CT System Performance Manual Brilliance CT System Performance

Test 12. Infant Mode Check

The purpose of this test is to check that the infant mode selection is properly calibrated.

1 Install the Infant head and Body phantom off the end of the table. This phantom has as 11 cm diameter head
water section and a 15 cm diameter body water section.
2 Using external lasers, align the phantom with the axis of rotation.
3 Scan the smaller head section of this phantom using an axial infant brain protocol at 120 kVp. Make sure that the
infant mode is selected for this scan. (Infant radio button checked when entering patient name).
4 Using a circular central ROI with a diameter of half of the water image diameter, measure the CT number of a
central slice of water and record the number in the data table below.
5 Scan the larger body section of this phantom using a helical infant body protocol (2-10 kg abdomen protocol).
Make sure that the infant mode is selected for this scan. (Infant radio button checked when entering patient
name).
6 Again, make sure that the infant mode is selected for this scan. (Infant radio button checked when entering
patient name).
7 Check that both the infant head and infant body images (away from the end caps and transitions) appear uniform
and free of ring and/or shading artifacts.

Infant Mode Check Results

Artifacts? Measured CT Number Specification

Infant Head Image 0±4

Infant Body Image 0±6

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Brilliance CT System Performance Manual Constancy Test Utility

Constancy Test Utility

The Constancy test utility enables you to run the Acceptance and Constancy tests. These tests may be required by local
authorities or by the site’s internal guidelines. The tests are performed by an authorized Philips Service representative.
The Acceptance test can be performed when the CT scanner is installed or run for the first time, after a significant upgrade, or
when the configuration is changed. Acceptance Test results are compared to factory default tolerances. The Acceptance test
sets the baseline.
The Constancy test is performed to ensure that the image quality of the CT scanner remains at the highest standards at all
times. It can be performed periodically at the discretion of the local authorities. Constancy Test results are compared to the
baseline generated by the Acceptance test.
The Constancy Test Automation tool supports automated stages. The tool supports two modes of operation: Baseline
measurement and Periodic measurement. These are the items checked by the Constancy Test Utility:
• Mean CT numbers of Head and Body protocols.
• CT Uniformity numbers of Head and Body protocols.
• Image Noise - Standard Deviation of Head and Body protocols.
• Spatial resolution as measured by the MTF at 10% and 50% in lp/cm.
• Slice Thickness measured at FWHM (in mm).
NOTE The CT scanner should be nominally calibrated by an authorized Philips service staff member. It is
recommended to perform the Air calibration immediately before running the Acceptance or Constancy tests.

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Brilliance CT System Performance Manual Constancy Test Utility

Getting Started
Perform a visual check of the system phantom to make sure it is in proper operating condition before running the Constancy
Test Utility. Make sure there isn’t an air bubble in the water pin of the body section or in the head section. If an air bubble is
present, open the screw on the cover of the water pin and inject some water. You must use the Brilliance CT system phantom
(p/n 455012001021).

The phantom is 8 inches long

1 Mount the phantom on the couch.

2 Run a vertical and horizontal axial Surview scan to precisely center the phantom:
a Run a vertical Surview scan.
b On a reconstructed image, turn on the Grid by selecting, Graphics > Grid > On Image.
c Make sure is centered on the Grid top to bottom, and left to right. If not, then position the phantom and run the Surview
again. Do this until the phantom is centered on the Grid.
d Run a horizontal Surview scan, then perfrom steps b and c until the image is centered on the Grid.
3 After you center the phantom, click the End Study button on the Scanner Application.
4 Click Yes on the popup dialog that appears.
5 On the Scanner Application, click Home > Logout.

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Brilliance CT System Performance Manual Constancy Test Utility

Setup
Before you can conduct the Acceptance or Constancy tests, you must complete a special log-in procedure. Follow these steps
to log-in.
1 Log onto the system using this user name: auto_test.
2 Type in the password: constancy.
3 On the Constancy Test Utility, click the Start Scanner Application button.
4 Once the Scanner Application is loaded, then click the Run Constancy Test button on the Constancy Test Utility.
5 Click OK on the opening dialog box that appears.
6 The configuration dialog box opens if system information has not been entered.

7 Fill in the fields accordingly.

8 In the Aculon CT number field, enter the value listed on the system phantom label for 120 kV body.
9 Click OK.
NOTE You can also access these parameters again from the Options/Site Configuration menu.

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Brilliance CT System Performance Manual Constancy Test Utility

10 The system conducts an automatic application initialization procedure. When it is complete, the patient data window
displays:
NOTE This window may be minimized to the Windows Taskbar.

11 Select the desired test option:

• To run an Acceptance test, go to “Acceptance test” on page 2-5.
• To run a Constancy test, go to “Constancy test” on page 2-10.

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Brilliance CT System Performance Manual Constancy Test Utility

Acceptance test
Use this procedure to run an Acceptance test.
1 On the Constancy Test Utility screen, click the Run Acceptance Test button. Click OK to continue:
NOTE If you have never run an Acceptance Test before, or if the last test was completed, skip to step 2.
If the previous run was not completed (not all stages were passed), a
confirmation message appears. Follow Step a below.
a Select one of the following:
• Yes - to complete the last run (failed stages will run).
• No - to run tests from the beginning (all stages will run).
• Cancel - to cancel the test.

2 The Scenario setup dialog box will appear.

• Fill in your name and the reason for performing the test.
• Click OK.

3 You will get the message at right. Click the OK button to continue, or
the Cancel button to stop the process.

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Brilliance CT System Performance Manual Constancy Test Utility

4 This message below will display. Follow the instructions on the screen.

a Set the couch vertical position to the requested height.

b Align the laser markers to the first groove on the phantom. This corresponds to the Physics Layer.

CAUTION It is extremely important to make sure the laser markers are properly aligned with the
marks on the phantom. If they are not, the Acceptance Test will fail.

c Click OK to continue. A series of tests run at this time. Do not interrupt the process until the results box appears. You can
also click Cancel to stop the process.

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Brilliance CT System Performance Manual Constancy Test Utility

CAUTION Do not use the CT Box to attempt to control the sequence. The tests run automatically.

CAUTION It is not recommended that you interrupt the test procedure however, you can do so
from the following dialog box that appears on the background of your terminal.

d After the first test, the utility will prompt you to adjust the height of the couch. Follow the instructions on the screen.
e The system displays several images during the process.

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Brilliance CT System Performance Manual Constancy Test Utility

5 After the run ends, a baseline is automatically saved. You receive the following message

6 Click OK.
NOTE A baseline is saved only if all stages passed and the measurements are within the required ranges.

7 If some of the stages were not completed, this message displays:

8 Click OK after you fix the cause of the failure, and retry the tests.

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Brilliance CT System Performance Manual Constancy Test Utility

9 Reports are generated automatically and opened in Microsoft Explorer. The following is an example of a test report
.

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Brilliance CT System Performance Manual Constancy Test Utility

Constancy test
Use this procedure to run a Constancy test.
1 On the Constancy Test Utility screen, click the Run Constancy Test button:
NOTE If you have never run an Constancy Test before, or if the last test was completed, skip to step 2.
If the previous run was not completed (not all stages were passed), a
confirmation message appears. Follow Step a below.
a Select one of the following:
• Yes - to complete the last run (failed stages will run).
• No - to run tests from the beginning (all stages will run).
• Cancel - to cancel the test.

2 If you choose Yes, the Scenario setup dialog box will appear.
• Fill in your name and the reason for performing the test.
• Click OK.

3 You will get the message at right. Click the OK button to continue, or
the Cancel button to stop the process.

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Brilliance CT System Performance Manual Constancy Test Utility

4 This message below will display. Follow the instructions on the screen.

a Set the couch vertical position to the requested height.

b Align the laser markers to the first groove on the phantom. This corresponds to the Physics Layer.

CAUTION It is extremely important to make sure the laser markers are properly aligned with the
marks on the phantom. If they are not, the Constancy Test will fail.

c Click OK to continue. A series of tests run at this time. Do not interrupt the process until the results box appears. You can
also click Cancel to stop the process.

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Brilliance CT System Performance Manual Constancy Test Utility

CAUTION Do not use the CT Box to attempt to control the sequence. The tests run automatically.

CAUTION It is not recommended that you interrupt the test procedure however, you can do so
from the following dialog box that appears on the background of your terminal.

d After the first test, the utility will prompt you to adjust the height of the couch. Follow the instructions on the screen.
e The system displays several images during the process.

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Brilliance CT System Performance Manual Constancy Test Utility

5 After the run ends, a baseline is automatically saved. You receive the following message

6 Click OK.
NOTE A baseline is saved only if all stages passed and the measurements are within the required ranges.

7 If some of the stages were not completed, this message displays:

8 Click OK after you fix the cause of the failure, and retry the tests.

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Brilliance CT System Performance Manual Constancy Test Utility

9 A report generates automatically and opens in Microsoft Explorer:

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Brilliance CT System Performance Manual Constancy Test Utility

Acceptance Test Indicators

When running the acceptance test, the Current baseline indicator text is replaced by Factory defaults. The Factory defaults
are then replaced by the newly created baseline if the run was successful and a new baseline was created.
The current baseline is displayed at the top of the screen. This indicator shows the current baseline. (When running a
Constancy test, the tolerances from the test are compared to the tolerances that were saved in the current baseline.)

The Status/Progress Indicator is located at the bottom of the screen and displays messages regarding the actions the utility
performs (such as generating report or idle).

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Brilliance CT System Performance Manual Constancy Test Utility

Constancy test results

The following sections explain how to process the Constancy test results. Access the
processing options by clicking Options > Re-define Acceptance/Constancy
Baselines.

Creating a baseline
Use this procedure to create a baseline from the Constancy Test results.
1 In the Re-define Acceptance/Constancy Baselines box, click Add Constancy
Baseline.
2 Select the timestamp of the test that was just completed.
3 Click OK to close the dialog box.

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Brilliance CT System Performance Manual Constancy Test Utility

Setting the current baseline

1 To set the current baseline, from Re-define Acceptance/Constancy Baselines
box, click Set Current Baseline. The available test results display.
2 Select a baseline (according to its timestamp) from the list.
The selected baseline becomes the current baseline. Note that after you click this
button, the selected baseline’s timestamp appears in the Current baseline indicator
in the main screen.

Adding an Acceptance Baseline

To add an acceptance baseline, in the Re-define Acceptance/Constancy
Baselines box, click Add Acceptance Baseline. This opens a dialog box
which provides the run results of the Acceptance Test from which you
can create a new baseline.
The new baseline is based on the last results for each stage from the first
test’s timestamp up until (and including) the timestamp you select. Note
that you can create a baseline only if all stages passed and all tolerances
are in their required ranges. (This option is useful when the test was run
from Expert Mode at least one time.)

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Brilliance CT System Performance Manual Constancy Test Utility

Adding a Constancy Baseline

To add a constancy baseline, in the Re-define Acceptance/Constancy
Baselines box, click Add Constancy Baseline.
You can create a new baseline from the list of Constancy Test run results.
The new baseline is based on the last results for each stage from the first
test’s timestamp up until (and including) the timestamp you select. Note
that you can create a baseline only if all stages passed and all tolerances
are in their required ranges. This option is useful when the test was run
from Expert Mode at least one time.

Removing a Baseline
1 In the Re-define Acceptance/Constancy Baselines box, select the baseline you want to remove from the list.
2 Click Remove Baseline. This message displays.

3 Select an option:
• Click Yes to the remove the baseline.
• Click No to keep the baseline.

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Brilliance CT System Performance Manual Constancy Test Utility

Viewing a baseline
In the Re-define Acceptance/Constancy Baselines box, click View Baseline. This
opens a window with the actual tolerances associated with the selected baseline.

Showing reports
To Show Reports, click the Show Report button in the Constancy Test
utility window.
A dialog box displays which consists of two lists with Acceptance and
Constancy test histories.
1 Select the report you want to view.
2 Click Show Report(s). You receive the report in Microsoft Explorer.

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Brilliance CT System Performance Manual Constancy Test Utility

Exporting reports
1 Save a report by clicking Export Reports. You receive the following dialog box which
allows you to select where you want to save the report.
2 Select the location where you want to save the file.
3 Click OK.

You can also reach this dialog box by selecting File > Export Report.
1 Select the desired report(s).
2 Click the Export Report button.

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