SERVICE MANUAL

Document 780020

Revision B

GE Signa CV/i™ 1.5T

FLOW 7000
PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)

GE Catalog Part Number: M1087PR

USAI Part Number: 160045

Copyright © 2001 by USA Instruments, Inc.

USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
REV B (06/21/01) SERVICE MANUAL

DAMAGE IN TRANSPORTATION

All packages should be closely examined at time of delivery. If damage is apparent, have
notation “damage in shipment” written on all copies of the freight or express bill before
delivery is accepted or “signed for” by a General Electric representative or a hospital receiving
agent. Whether noted or concealed, damage MUST be reported to the carrier immediately
upon discovery, or in any event, within 14 days after receipt, and the contents and containers
held for inspection by the carrier. A transportation company will not pay a claim for damage if
an inspection is not requested within this 14 day period.

Immediately complete a "Damage Loss Claim Form", available via MS Exchange Mail, after
the damage is found.
MS Exchange Path:
Outlook/Public Folder/All Public Folders/Medical Systems/!Global Initiatives/Information
Management/Forms/Common Forms/DAMAGE LOSS CLAIM FORM.
Send the completed form to the email address listed in the form.

For more information about the Transportation Claim Procedure, access the GE Medical
Systems Intranet and enter the following URL address (case sensitive):
ftp://3.87.40.2/globepro/qualsys/Docs/190016MF.PDF

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
REV B (06/21/01) SERVICE MANUAL

Language Policy For Service Documentation (Dir. 2128126)

§ This service manual is available in English only.

§ If a customer’s service provider requires a language other than English, it is the
WARNING
customer’s responsibility to provide translation services.
§ Do not attempt to service the equipment unless this service manual has been
consulted and is understood.
§ Failure to heed this warning may result in injury to the service provider, operator or
patient from electric shock, mechanical or other hazards.

§ Ce manuel de maintenance n’est disponible qu’en anglais.

AVERTISSEMENT § Si le technicien du client a besoin de ce manuel dans une autre langue que
l’anglais, c’est au client qu’il incombe de le faire traduire.
§ Ne pas tenter d’intervention sur les équipements tant que le manuel service n’a
pas été consulté et compris.
§ Le non–respect de cet avertissement peut entraîner chez le technicien, l’opérateur
ou le patient des blessures dues à des dangers électriques, mécaniques ou autres.

§ Dieses kundendienst-handbuch existiert nur in englischer sprache.

§ Falls ein fremder kundendienst eine andere sprache benötigt, ist es aufgabe des
WARNUNG
kunden für eine entsprechende übersetzung zu sorgen.
§ Versuchen sie nicht, das gerät zu reparieren, bevor dieses kundendienst-handbuch
nicht zu rate gezogen und verstanden wurde.
§ Wird diese warnung nicht beachtet, so kann es zu verletzungen des
kundendiensttechnikers, des bedieners oder des patienten durch elektrische
schläge, mechanische oder sonstige gefahren kommen.

§ Este manual de servicio sólo existe en inglés.

AVISO § Si algún proveedor de servicios ajeno a gems solicita un idioma que no sea el
inglés, es responsabilidad del cliente ofrecer un servicio de traducción.
§ No se deberá dar servicio técnico al equipo, sin haber consultado y comprendido
este manual de servicio.
§ La no observancia del presente aviso puede dar lugar a que el proveedor de
servicios, el operador o el paciente sufran lesiones provocadas por causas
eléctricas, mecánicas o de otra naturaleza.

§ Este manual de assistência técnica só se encontra disponível em inglês.

ATENÇÃO § Se qualquer outro serviço de assistência técnica, que não a gems, solicitar estes
manuais noutro idioma, é da responsabilidade do cliente fornecer os serviços de
tradução.
§ Não tente reparar o equipamento sem ter consultado e compreendido este manual
de assistência técnica.
§ Não cumprimento deste aviso pode por em perigo a segurança do técnico,
operador ou paciente devido a‘ choques elétricos, mecânicos ou outros.

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
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§ Il presente manuale di manutenzione è disponibile soltanto in inglese.

§ Se un addetto alla manutenzione esterno alla gems richiede il manuale in una
AVVERTENZA lingua diversa, il cliente è tenuto a provvedere direttamente alla traduzione.
§ Si proceda alla manutenzione dell’apparecchiatura solo dopo aver consultato il
presente manuale ed averne compreso il contenuto.
§ Non tenere conto della presente avvertenza potrebbe far compiere operazioni da
cui derivino lesioni all’addetto alla manutenzione, all’utilizzatore ed al paziente per
folgorazione elettrica, per urti meccanici od altri rischi.

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
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TABLE OF CONTENTS

Damage in Transportation ...................................................................................................................................... 2

Section 1 – Introduction .......................................................................................................................................... 6
1-1 Product Identification and Shipping List ........................................................................................................... 6
1-2 Compatibility ..................................................................................................................................................... 7
1-3 Related Documentation .................................................................................................................................... 7
1-4 Environmental Requirements ........................................................................................................................... 7
1-5 Theory of Operation.......................................................................................................................................... 9
Section 2 – Setup And Calibration ....................................................................................................................... 12
2-1 Coil Installation ............................................................................................................................................... 12
2-1-1 Special Install Notes ................................................................................................................................ 12
2-1-2 Configuration............................................................................................................................................ 12
2-2 Installation Functional Checks........................................................................................................................ 12
2-3 Periodic Quality Assurance Check ................................................................................................................. 12
Section 3 – Functional Checks ............................................................................................................................. 13
3-1 Scanner Verification ....................................................................................................................................... 13
3-2 Coil Imaging Performance Verification ........................................................................................................... 13
3-2-1 Tools Required......................................................................................................................................... 13
3-2-2 Explanation of Procedure......................................................................................................................... 13
3-2-3 Signal Scan .............................................................................................................................................. 13
3-2-4 Noise Scan............................................................................................................................................... 16
3-2-5 SNR Image Analysis ................................................................................................................................ 18
3-3 External Cable Check..................................................................................................................................... 21
3-4 PIN Diodes Check .......................................................................................................................................... 22
3-5 Mechanical Hardware Check ......................................................................................................................... 23
3-6 Troubleshooting Tips ...................................................................................................................................... 24
Section 4 – Maintenance ....................................................................................................................................... 26
4-1 Coil Care......................................................................................................................................................... 26
4-2 Special Care Requirements ........................................................................................................................... 26
Section 5 – Replacement....................................................................................................................................... 27
5-1 External Cable Replacement.......................................................................................................................... 27
5-2 Mechanical Hardware Replacement .............................................................................................................. 27
Section 6 – Renewal Parts .................................................................................................................................... 28
6-1 Field Replaceable Units.................................................................................................................................. 28
6-2 Other Replaceable Accessories ..................................................................................................................... 28
Section 7 – Appendix............................................................................................................................................. 29
7-1 SNR Data Sheet ............................................................................................................................................. 29
7-2 Schematic ....................................................................................................................................................... 30
7-3 Coil Configuration ........................................................................................................................................... 31
Revision History..................................................................................................................................................... 32

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
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SECTION 1 – INTRODUCTION

1-1 Product Identification and Shipping List

To identify the Flow 7000 Phased Array Peripheral Vascular Coil (Small), refer to the coil label
(as shown in Figure 1).

Figure 1. Coil labels.

Figure 2 shows a picture of the Flow 7000 Phased Array Peripheral Vascular Coil (Small).

Figure 2: The Phased Array Peripheral

Vascular Coil (Small).

SHIPPING LIST – TABLE 1-1

Box # Part Name GE Part # USAI Part # Qty
1 Coil 2293676-2 100181 1
1 Ramp Pad E8800SA 150101 1
1 Patient Comfort Pad E8800SC 150166 1
1 Foam Spacer Block E8800SD 150165 1
1 Velcro Strap Set (attached to coil) E8800ZZ 150042 1
1 Phantom Strap Set 2285178-4 150171 1
1 Operator’s Guide 2293676-7 770041 1
1 Service Manual 2293676-8 780020 1
2 Phantom Positioner Set 2293676-6 150121 1
3 Loading Phantom 2192406-7 150035 2
3 SNR Phantom 2293676-4 150032 1
4 SNR Phantom 2293676-4 150032 2

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1-2 Compatibility

This coil is compatible with the Signa CV/ic 1.5T system.

1-3 Related Documentation

Operator’s Guide, GE Part Number 2293676-7.

Signa LX Service Methods CD, 2160623-1.

1-4 Environmental Requirements

Storage Requirements
To store the coil, a storage space of 57.25” (145.4 cm) x 27.9” (70.8 cm) x 12” (30.5 cm) is
required. Position the ramp pad and posterior array coil completely flat. Place a sheet on top
of the posterior array coil. The sheet separates the posterior array coil and anterior array coil
to prevent them from sticking. Place the anterior array coil on top of the sheet and loosely
fasten the Velcro straps. Note that although the straps are fastened together, the coil is not
bent (see Figure 3).
The phantoms may be stored next to the coil as shown in Figure 3 or in the shipping box as
shown in Figure 4.
Note: The coil should be handled with care. Gently bend the coil when necessary – never
fold/crease the coil sharply. Avoid excessive folding of the coil.

Step 1

Step 2

Step 3

Step 4

Figure 3: Storing the coil.

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Figure 4: Storing the phantoms in the shipping box.

Dimensions
Ramp Pad 57.34” x 15.50” x 4.90” (145.64 cm x 39.37 cm x 12.45 cm)
Posterior Coil 57.25” x 27.87” x 1.57” (145.41 cm x 70.79 cm x 3.99 cm)
Anterior Coil 57.25” x 14.50” x 1.62” (145.41 cm x 36.83 cm x 4.11 cm)
Loading Phantom 17.3” x 9.4” x 1.6” (44.0 cm x 23.8 cm x 4.1 cm)
SNR Phantom Diameter: 6.6” (16.8 cm), Length: 10.6” (27.0 cm)
Weight
Ramp Pad 6 lbs. (2.72 kg)
Posterior Coil 14 lbs. (6.35 kg)
Anterior Coil 11 lbs. (4.99 kg)
Loading Phantom 11 lbs. (4.99 kg)
SNR Phantom 15 lbs. (6.80 kg)

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1-5 Theory of Operation

The coil package is a flexible two-piece design. The coil also has a ramp pad that is
positioned underneath the lower coil piece. The purpose of the ramp pad is to facilitate the
positioning of the body vasculature in a horizontal plane. The coil contains 12 elements that
are physically arranged into six pairs. A block diagram of the individual coil elements is shown
in Figure 5. Also refer to the schematic in the Appendix. A maximum of four RF inputs,
representing either the upper (CPVUPPER), middle (CPVMIDDLE) or lower (CPVLOWER)
four coils can be selected at a time (see Figures 6, 7 and 8).
The Flow 7000 Phased Array Peripheral Vascular Coil is a receive-only coil. The coil is
decoupled from the transmit coil during transmit by means of a RF choking circuit. These RF
chokes can be switched on actively or passively. Each loop coil has six decoupling RF chokes
(one active and five passive) and each saddle has eight decoupling chokes (one active and
seven passive). Passive decoupling is achieved when small signal diodes are turned on by
the induced RF voltage, in the chokes, coupled from the transmit field. Each small signal
diode is turned on when the induced RF voltage reaches 0.5 volt. Active decoupling is
achieved by PIN diodes that are turned on by a biasing DC current source (200mA) from the
MR scanner. When either the small signal diodes or PIN diodes are turned on the RF choking
circuits become very high impedance (typically above 2 kilo-ohm) blocks, compared to the
other circuit elements (less than 25 ohm). These high impedance elements segregate the coil
circuitry into several electrical segments.

E2 E4 E6 E8 E10 E12

E1 E3 E5 E7 E9 E11

Figure 5: Block diagram of the coil.

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B3
Receiver 2*
Preamp 2
B7
Receiver 4*

B11 Preamp 4

Preamp 6
B15
Preamp 8
E2 E4 E6 E8 E10 E12 A1
A3
A5
A7
A9
A11
A13
A15

E1 E3 E5 E7 E9 E11
B13
Preamp 7
B9

Preamp 5
B5
Receiver 3*
B1 Preamp 3
Receiver 1*
Preamp 1

Active Inactive
Element Element

Figure 6: “CPVUPPER” signal path (port mask 3).*

B3
Preamp 2
B7
Preamp 4
B11
Receiver 2
B15 Preamp 6
Receiver 4
Preamp 8
E2 E4 E6 E8 E10 E12 A1
A3
A5
A7
A9
A11
A13
A15

E1 E3 E5 E7 E9 E11
B13 Receiver 3
Preamp 7
B9
Receiver 1
B5 Preamp 5

Preamp 3
B1
Preamp 1

Active Inactive
Element Element

Figure 7: “CPVMIDDLE” signal path (port mask 12).*

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B3
Receiver 2
Preamp 2
B7

Preamp 4
B11

Preamp 6
B15
Receiver 4
Preamp 8
E2 E4 E6 E8 E10 E12 A1
A3
A5
A7
A9
A11
A13
A15

E1 E3 E5 E7 E9 E11
B13 Receiver 3
Preamp 7
B9
Preamp 5
B5

Preamp 3
B1
Receiver 1
Preamp 1

Active Inactive
Element Element

Figure 8: “CPVLOWER” signal path (port mask 9).*

*Note: LX and Genesis Systems Receiver Numbers – Table 1-5 relates receiver numbering in
LX and Genesis systems.

LX AND GENESIS SYSTEMS RECEIVER NUMBERS – TABLE 1-5

System Receiver Numbers
LX User Interface 1 2 3 4
LX Hardware Docs 0 1 2 3
Genesis User Interface 0 1 2 3
Genesis Hardware Docs 0 1 2 3

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SECTION 2 – SETUP AND CALIBRATION

2-1 Coil Installation

2-1-1 Special Install Notes

The Phased Array Peripheral Vascular Coil (Small) requires all eight (8) phased array
preamplifiers to be installed in the system. Refer to the system manuals for information on
installing the preamplifiers. Also, refer to instructions in the preamplifier kit (GE Part Number
M1087CY).
If the coil will be used on more than one system, a preamplifier kit for each system must be
installed.

2-1-2 Configuration
The system will automatically recognize the coil using the Coil ID feature. No configuration
should be required. For reference, the configuration information is included in the Appendix;
however, that configuration is only current as of the printing of this manual.

2-2 Installation Functional Checks

1. From the Scan Desktop, start new scan by selecting [New Pt]; set Patient ID to “geservice”
and Patient Weight to “111” pounds. Click [Patient Position] to open protocols window.
2. Plug the coil into the patient table and verify the coil indicator light turns green. A green
light indicates the system hardware identifies the coil.
3. At the console, verify the Coil has been properly identified by the system: correct name in
Coil field and correct picture on the screen.
4. Perform system level Signal to Noise Check. Refer to Service Methods CD; System Level
Procedures; Functional Checks; Signal to Noise Check.
5. Perform Section 3-2 Coil Imaging Performance Verification.

2-3 Periodic Quality Assurance Check

On a periodic basis, such as during planned maintenance, perform the quality assurance
checks as outlined below to ensure the coil is operating properly.
1. Check external cable for cracks or cuts.
2. Perform Section 3-2 Coil Imaging Performance Verification and record data values in Data
Sheet.

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SECTION 3 – FUNCTIONAL CHECKS

3-1 Scanner Verification

Perform system level Signal to Noise Check. Refer to Service Methods CD; System Level
Procedures; Functional Checks; Signal to Noise Check.

3-2 Coil Imaging Performance Verification

3-2-1 Tools Required

TOOLS REQUIRED – TABLE 3-2-1
Description GE Part # USAI Part # Qty
SNR Phantom 2293676-4 150032 3
Loading Phantom 2192406-7 150035 2
Phantom Positioner Set 2293676-6 150121 1
Phantom Strap Set 2285178-4 150171 1

3-2-2 Explanation of Procedure

The PV array has three sections controlled by the coil configuration files: CPVUPPER,
CPVMIDDLE, and CPVLOWER. For evaluation of coil performance, sagittal images will be
acquired on the three sections of the coil using the protocol given below.
SNR measurements must be made for each mode, requiring three sets of signal and noise
scans. Refer to the Data Sheet in Appendix 7-1 to understand the data required to calculate
the individual element SNR for each mode of operation. All ROI measurements are made on
the individual element images, not on the composite image.
The image quality check uses two different protocols for signal and noise image acquisition.
The signal scan is an FSE sequence used to minimize susceptibility and B0 inhomogeneity
effects. The noise scan is a GRE sequence that has a Control Variable (do_noise) to eliminate
the transmit RF completely during the scan. The signal scan must be run prior to the noise
scan as the R1, R2, and TG values from the signal scan are used for the noise scan.

3-2-3 Signal Scan

1. From the Scan Desktop, start new scan by selecting [New Pt]; set Patient ID to
“geservice” and Patient Weight to “111” pounds. Click [Patient Position] to open
protocols window.

2. Place the ramp pad, the posterior array coil, the phantom positioner lower section, and
the loading phantom on the patient table as shown in Figure 10. The coil should be
positioned such that its cables exit toward the magnet.
3. Position the three SNR phantoms in the phantom positioner lower section so the handles
do not interfere with the phantom positioner upper section. Place the phantom positioner
upper section with the loading phantom over the SNR phantoms as shown in Figure 10.

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4. Lastly, place the anterior array coil over the phantom positioner upper section and loading
phantom, and secure them together with the Velcro straps as shown in Figure 10.

Upper Section of
Phantom Positioner

Loading Phantom (Set of 2)

Lower Section of
Phantom Positioner

SNR Phantom (Set of 3)

Figure 9: Parts of the coil phantom set.

Step 1

Step 2

Step 3

Step 4

Step 5
Figure 10: Assembling the coil phantom set.

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5. For the Upper section, set the landmark on the landmark line that is marked on the upper
(head) end of the coil (see Figure 11). When scanning the Middle section, set the
landmark in the middle landmark line (see Figure 11). For the Lower section, set the
landmark on the lower landmark line (foot) end of the coil (see Figure 11).

CPV UPPER CPV MIDDLE CPV LOWER

LANDMARK LANDMARK LANDMARK

Figure 11: Coil landmarks.

6. At the magnet, press the “Alignment Light” button to turn on the light. Move the cradle
to align the coil landmark to the alignment lights as shown in Figure 11. Press the
“Landmark” button to landmark the alignment.
7. Move the coil to scan position by pushing the “Move to Scan” button, ensuring the cable
does not get snagged.
8. At the operator console, set the protocols per the Signal section from the Signal and
Noise Protocols – Table 3-2-4.
9. Click [Save Series] to download the protocols; then click [Prepare to Scan].
10. Open the [Display CVs] menu under [Research Operations] (click the right mouse
button). Set the “saveinter” CV to “1” (saves the intermediate images so ROI
measurements can be performed).
11. Run [Auto Prescan]. Record the R1, R2 and TG values on the SNR Data Sheet (found
in the Appendix).
12. Run [Scan].

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3-2-4 Noise Scan

A signal scan must be run prior to the noise scan as the same R1, R2 and TG values must be
used for both the signal and noise scans. Do not run an Auto Prescan prior to the noise scan
as the values will be changed.
1. Copy the signal scan series. Use [Copy Series] (highlight signal series and click the right
mouse button) and [Paste Series] in RX Manager.
2. Click [View Edit] and set the protocols per the Noise section from the Signal and Noise
Protocols – Table 3-2-4.
3. Click [Save Series] and click [Prepare to Scan].
4. Open the [Display CVs] menu under [Research Operations]. Set the “saveinter”,
“rhformat”, and “do_noise” CVs to “1”.
5. Run [Manual Prescan], do not make any changes, and click [Done].
6. Run [Scan].

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SIGNAL AND NOISE PROTOCOLS – TABLE 3-2-4

Protocol Signal Noise
Patient/Exam Information
Patient ID geservice geservice
Patient Name PV Array PV Array
Patient Weight 111 lbs. (50 kg) 111 lbs. (50 kg)
Patient Position
Patient Position Supine Supine
Patient Entry Feet First Feet First
CPVUPPER, CPVMIDDLE, or CPVUPPER, CPVMIDDLE, or
Coil
CPVLOWER CPVLOWER
Series Description Signal Noise
Imaging Parameters
Plane Sagittal Sagittal
Mode 2D 2D
Pulse Seq FSE GRE
Imaging Options Variable Bandwidth Variable Bandwidth
PSD Name leave blank leave blank
Protocol leave blank leave blank
Scan Timing
# of Echoes 1 1
TE 17 17
TR 500 500
Echo Train Length/Flip Angle 4 1
Bandwidth 15.63 15.63
Additional Parameters
no entries required in this area
Acquisition Timing
Freq 256 256
Phase 256 256
NEX 1 1
Phase FOV 1 1
Freq DIR S/I S/I
Auto Center Freq Peak Peak
Autoshim On On
Phase Correct On On
Contrast Off Off
# of Reps B4 Pause 0 0
Scanning Range
FOV 38 38
Slice Thickness 3 3
Spacing 1.5 1.5
Start R/L 0 0
P/A Center A50 A50
I/S Center 0 0
End R/L 0 0
Slices 1 1
Table Delta 0 0

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3-2-5 SNR Image Analysis

SNR Measurement
Regions of interest in both signal and noise images can be measured directly in the image
browser. Click the user interface button Measure, select the circular or rectangular shape, and
adjust its size and orientation when the shape is displayed in the selected image. Mean,
standard deviation, and area of the ROI will appear in the lower right corner of the image.
For the signal measurement, choose a rectangular ROI covering the appropriate section of the
phantom for the receiver channel being scanned. The rectangular ROI should be about 8600
mm2. ROIs are shown in Figures 12 through 16.
The SNR is calculated using the signal to noise ratios of the individual receiver channels:

Note: The SNR calculation uses the MEAN of the signal image and STANDARD DEVIATION
of the noise image. SNR is measured for each element, not on the composite image.

Figure 12: CPV Upper/Middle/Lower receiver 1. Figure 13: CPV Upper/Middle/Lower receiver 2.
ROI ≈ 8600 mm . ROI ≈ 8600 mm .
2 2

7.5 cm A-P, 12.5 cm S-I. 7.5 cm A-P, 12.5 cm S-I.

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Figure 14: CPV Upper/Middle/Lower receiver 3. Figure 15: CPV Upper/ Middle/ Lower receiver 4.
ROI ≈ 8600 mm ROI ≈ 8600 mm .
2. 2

7.5 cm A-P, 12.5 cm S-I. 7.5 cm A-P, 12.5 cm S-I.

Figure 16: CPV Upper/Middle/Lower noise scan.

ROI ≈ 118000.

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Individual Element Performance

Figures 17 through 21 below show typical receiver images for CPV Upper, Middle, or Lower
configurations.

Figure 17: CPV Upper/Middle/Lower Figure 18: CPV Upper/Middle/Lower

receiver image #1. receiver image #2.

Figure 19: CPV Upper/Middle/Lower Figure 20: CPV Upper/Middle/Lower

receiver image #3. receiver image #4.

Figure 21: CPV Upper/Middle/Lower

composite image.

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SNR Specification
The SNR measurements must be greater than or equal to the following specifications:

SNR SPECIFICATIONS – TABLE 3-2-5

CH0 CH1 CH2 CH3
CPV UPPER 116.6 86.6 123.8 100.4
CPV MIDDLE 148.2 139.7 179.2 137.6
CPV LOWER 201.3 162.6 233.2 167.9

3-3 External Cable Check

Check for continuity in the output cable.
Step 1 – Using a Digital Volt Meter (DVM), separate the output cable from the anterior coil by
pushing the buttons located on the sides of the cable housing and gently pulling the connector
out of the socket.
Step 2 – Follow the same procedure for the posterior coil.
Step 3 – Make sure there is continuity between the appropriate pin at the 30-pin connector that
plugs into the system and the connectors that plug into the anterior and posterior coils (see
Figure 22 and Center Pin and Ground Connections – Table 3-3 for the correct pins).

CENTER PIN AND GROUND CONNECTIONS – TABLE 3-3

Connector to Coil Pins 30-Pin Connector to Cradle
Anterior, Center Pin 1 Pin B11
Anterior, Ground 1 Pin A11
Anterior, Center Pin 2 Pin B15
Anterior, Ground 2 Pin A15
Anterior, Center Pin 3 Pin B3
Anterior, Ground 3 Pin A3
Anterior, Center Pin 4 Pin B7
Anterior, Ground 4 Pin A7
Posterior, Center Pin 1 Pin B5
Posterior, Ground 1 Pin A5
Posterior, Center Pin 2 Pin B1
Posterior, Ground 2 Pin A1
Posterior, Center Pin 3 Pin B13
Posterior, Ground 3 Pin A13
Posterior, Center Pin 4 Pin B9
Posterior, Ground 4 Pin A9

15 1
B
A
15 1
30-Pin Housing
Anterior Posterior
Connector 1 2 3 4 Connector 1 23 4

Figure 22: Pin layouts of 30 pin housing, anterior and posterior connectors.

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3-4 PIN Diodes Check

Step 1 – Remove the coil covers
Step 2 – Gently pry up the four white screw covers located down the middle of the anterior
cover and the three white screw covers located down the middle of the posterior cover.
Step 3 – Remove all the screws found under the covers.
Step 4 – Remove the center covers from both the anterior and posterior coils.
Step 5 – Check the pin diodes located on the feed boards of the individual coil elements with a
DVM. Every coil element has one diode (see Figures 23, 24 and 25 for the location of the
diodes).
Step 6 – If a diode is found to be either open or shorted:
• Take note of the diode’s cathode-anode orientation.
• Carefully de-solder the surface mounted diodes from the feed board.
• Cut the leads of a new diode to 1/8”.
• Place the new diode into the hole on the PCB. Align the leads of the diode with the
surface mount pads.

Pin
Diode

Figure 23: Saddle feedboard on the posterior coil.

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Pin
Diode

Figure 24: Loop feedboard on the posterior coil.

Pin Diode

Figure 25: Loop feedboard on the anterior coil.

3-5 Mechanical Hardware Check

None.

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REV B (06/21/01) SERVICE MANUAL

3-6 Troubleshooting Tips

When troubleshooting the coil, refer to the receiver images for PV Upper, Middle, or Lower
configurations in Figures 17 through 21 in Section 3-2-5 SNR Image Analysis and the element-
to-receiver mapping diagrams in Figures 6, 7 and 8.
Symptom #1: The system reports a coil fault during prescan or does not recognize the coil
connection to the system when selected in the software.

Probable Cause Suggested Actions Resolution

Engage connector and try the
The coil connector has
scan again. Make sure the
become disconnected Check to make sure the coil connector
indicator light on the patient table
from the system is fully engaged.
turns green with the proper coil
interface.
selected on the console.
From inside the coil, check the PIN
diodes using a DVM. Use diode mode
for forward-bias measurements and
One or more PIN diodes resistance mode for reverse-bias
Replace the coil.
have failed. measurements. Note that there should
be no reverse-bias leakage. Bad PIN
diodes are usually shorted or exhibit
reverse-bias leakage current.
If a short or open is observed,
There is a DC short or
Check the coil and associated DC check the output cable by itself
open somewhere within
paths with a DVM, in both diode check (see below). If the cable and PIN
the DC path inside the
and resistance modes. diodes are okay, then replace
coil.
the coil.
Disconnect the cable at the coil and
check each coaxial line with a DVM
(resistance). Try moving and twisting
the cable as you watch the meter to
The output cable has a
find any intermittent connections. Replace the coil.
short or an open.
Inspect the center pins of the SMB
and Bendix connections for wear and
proper engagement into the mating
connection.

There is a problem with Check to ensure the correct DC bias

the DC bias from the is being provided to the coil during
system interface or the transmit and receive per GEMS
Correct MRI system problem.
coil ID circuitry. System Service Manual. Try a similar
2-channel coil to see if the same
problem occurs

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Symptom #2: The coil does not pass SNR tests or exhibits poor image quality on patient
scans.

Probable Cause Suggested Actions Resolution

Look at the uncombined images to
determine which channel has the
problem. Compare the noise standard
deviation measurements between
channels and system performance
One or more of the coil logs; they should be approximately the
channels has a high noise same. Replace the coil.
level.

Try swapping preamplifiers between

channels to see if the problem follows
the preamp. If it does, then the
preamplifier is bad.
Look at the uncombined images to
determine which channel has the
One or more of the coil
problem. Compare signal mean Replace the coil.
channels has low signal.
measurements between channels and
system performance logs.
If padding or changing the
Window and level the images down to phantom position can
look at the background for signs of minimize ghosting, then the
Excessive ghosting is ghosting. Try padding the phantom in problem is caused by
causing the noise std. dev. the holder. Try running the scan excessive vibration
measurements to be without the phantom holder to see if the elsewhere in the system. If
artificially high. ghosting diminishes. Try turning off the the ghosting is not
cold heads to see if the ghosting is symptomatic of phantom
vibration-related. positioning or padding, then
replace the coil.
There is a problem with Check to ensure the correct DC bias is
the DC bias from the being provided to the coils during Correct MRI system DC bias
system interface or the coil transmit and receive per GEMS System problem.
ID circuitry. Service Manual.

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
REV B (06/21/01) SERVICE MANUAL

SECTION 4 – MAINTENANCE

4-1 Coil Care

Element 1 Composite
WARNING

Detach the coil connector from the scanner before attempting to clean the coil. Do not
touch the connectors with bare fingers. Never press a sharp object against the surface
of the connector. Do not reattach the connector after cleaning the coil until the coil has
dried completely. Electric shock may result if the coil is attached to the system during
cleaning or when it is wet.

CAUTION

Do not spray or pour the cleaning solution directly on the coil. Do not submerge the
coil in the solution. The coil contains sensitive electronic components that could be
damaged by the solution. The coil cannot be sterilized and should be cleaned only
according to the procedure outlined in this section.
The following solutions are recommended for the coil and pad surfaces: (1) a ten percent
bleach solution (some discoloration may occur), (2) one ounce commercial dishwashing liquid
mixed with one gallon of water or (3) warm water. Apply cleaning solution to a soft cotton cloth
and proceed to clean. To prevent soiling of the coil, the user should place a cotton sheet over
the coil before positioning the patient. If the coil is soiled, clean the coil as described above.

4-2 Special Care Requirements

Prior to returning a coil for service, use a ten percent bleach solution (as described above) to
eliminate risk of exposure to potentially infectious materials.

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REV B (06/21/01) SERVICE MANUAL

SECTION 5 – REPLACEMENT
Simple removals that are clearly obvious are not described here.
Unless otherwise noted, the steps for re-assembly are simply the reverse order of the steps
described for disassembly.

5-1 External Cable Replacement

The cable is a separate part of the coil. If the cable needs to be replaced, detach it from the
coil and replace it with a new cable assembly.

5-2 Mechanical Hardware Replacement

None.

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
REV B (06/21/01) SERVICE MANUAL

SECTION 6 – RENEWAL PARTS

6-1 Field Replaceable Units

FIELD REPLACEABLE UNITS – TABLE 6-1

Part Name GE Part # USAI Part #
Coil 2293676-2 100181
Cable Assembly 2293676-3 110035
SNR Phantom 2293676-4 150032
Loading Phantom 2192406-7 150035
Phantom Positioner Set 2293676-6 150121
Phantom Strap Set 2285178-4 150171

6-2 Other Replaceable Accessories

OTHER REPLACEABLE ACCESSORIES LIST – TABLE 6-2

Part Name GE Part # USAI Part #
Ramp Pad E8800SA 150101
Patient Comfort Pad E8800SC 150166
Foam Spacer Block E8800SD 150165
Velcro Strap Set E8800ZZ 150042
Coil Shipping Container Set 150126
Phantom Shipping Container Set 150127

Figure 26: Parts of the coil.

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REV B (06/21/01) SERVICE MANUAL

SECTION 7 – APPENDIX

7-1 SNR Data Sheet

Use the table provided below to record the calculated signal to noise ratio (SNR) data obtained
from the Functional Checks section.

Date Comments

Signal Noise Spec

Mode R1 R2 TG Element SNR
Mean Std Dev Limit
CPVUPPER 0 116.6
1 86.6
2 123.8
3 100.4
CPVMIDDLE 0 148.2
1 139.7
2 179.2
3 137.6
CPVLOWER 0 201.3
1 162.6
2 233.2
3 167.9

Date Comments

Signal Noise Spec

Mode R1 R2 TG Element SNR
Mean Std Dev Limit
CPVUPPER 0 116.6
1 86.6
2 123.8
3 100.4
CPVMIDDLE 0 148.2
1 139.7
2 179.2
3 137.6
CPVLOWER 0 201.3
1 162.6
2 233.2
3 167.9

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USA INSTRUMENTS, INC. FLOW 7000 PHASED ARRAY PERIPHERAL VASCULAR COIL (SMALL)
REV B (06/21/01) SERVICE MANUAL

7-2 Schematic

Anterior Coil Elements 2, 4, 6, 8, 10 and 12

Passive Posterior Coil Elements 1 and 3 Active
Blocking Blocking
Circuit Circuit

Output Cable

Passive Active
Blocking Blocking
Circuit Circuit

Posterior Coil Element 5, 7, 9 and 11

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7-3 Coil Configuration

Parameter Modes
Coil Name CPVUPPER CPVMIDDLE CPVLOWER
Coil Type 3 3 3
Extremity Coil no no no
Cable Loss 1.2 1.2 1.2
Coil Loss 0.952 0.952 0.952
Recon Scale Factor 1 1 1
Linear vrs Quadrature 1 1 1
Multiple Receiver Coil? yes yes yes
Number of Receivers 4 4 4
Starting Receiver ID 0 0 0
Ending Receiver ID 3 3 3
Multi-Coil Port Enable 3 12 9
Multi-Coil Port Error Enable 3 12 9
Additional Transmit Attenuation 0 0 0
Number of Fast Receivers 0 0 0
Starting Fast Receiver ID 4 4 4
Ending Fast Receiver ID 4 4 4
Start TA Value 90 90 90
Start RG Value 12 12 12
Multi-Coil Recon Enable 0 0 0
Head Default Freq Direction 0 0 0
Phased Array T/R Coil for Autoshim -1 -1 -1

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REVISION HISTORY
Rev Date Author Primary Reason for Change
A 06/11/01 Reva Zaretsky First Issue
B 06/21/01 Reva Zaretsky Revised Tools Required Table

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