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CT and CBCT

Computed Tomography (CT) is a widely used imaging technique for diagnosing various dento-maxillofacial conditions, offering detailed views and precise anatomical locations. Cone Beam Computed Tomography (CBCT) is a newer method that generates 3D images with reduced radiation exposure and rapid scan times, but it has its own set of artifacts and limitations. Both imaging modalities have specific applications in fields such as implant imaging, orthodontics, and trauma assessment.

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10 views5 pages

CT and CBCT

Computed Tomography (CT) is a widely used imaging technique for diagnosing various dento-maxillofacial conditions, offering detailed views and precise anatomical locations. Cone Beam Computed Tomography (CBCT) is a newer method that generates 3D images with reduced radiation exposure and rapid scan times, but it has its own set of artifacts and limitations. Both imaging modalities have specific applications in fields such as implant imaging, orthodontics, and trauma assessment.

Uploaded by

Sam hatake
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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COMPUTED TOMOGRAPHY (CT) & CONE BEAM COMPUTED

TOMOGRAPHY (CBCT)

ASS. PROF

ZAINAB H. AL-GHURABI

Computed Tomography (CT): is a well-accepted imaging modality for evaluation


of the entire body.

Computed Tomography (CT) Scan Machines Uses X- rays, a powerful form of


Electromagnetic Radiation.

CT has undergone several evolutions and nowadays multi- detectors CT scanners


have been evolved which have better application in clinical field.

Applications of CT

MDCT imaging has several applications in the diagnosis and treatment of dento-
maxillofacial diseases:

Infections, including osteomyelitis and space infections

• Midfacial and mandibular trauma

• Developmental anomalies of the craniofacial skeleton

• Benign intraosseous cysts and neoplasms of the jaws

• Benign and malignant neoplasms that originate in, or extend into, the

orofacial soft tissues

• Soft-tissue cysts
Advantages of CT

It provides axial, coronal and sagittalviews of the tissue.

• It shows anatomically precise location ofthe lesion and extent.

• The structures of the soft tissues both normal and pathological are clearly
displayed .

• Because the image that is produced is formulated by the computer, areas of


interest may be selectively viewed and enlarged by using computer programmers.

• As the information is stored in the computer it can be viewed any time in


the absence of patient.

• Image can be manipulated.

Disadvantages of CT

Is sophisticated, costly and expensive to maintain.

• Very high-density materials such as metal bullets and dental restorations


produce severe artefacts on CT scan, which makes the interpretation difficult.

• There is an inherentrisk associated with the contrast medium.

Cone-beam computed tomography (CBCT)

Is a new medical imaging technique that generates 3D images.

This imaging technique is based on a cone shaped X-ray beam centered on a 2D


detector that performs one rotation around the object, producing a series of 2D
images.

Components of CBCT

CBCT is composed of X-ray source with a rotating gantry.


A divergent pyramidal or cone-shaped source of ionizing radiation is directed
through the middle of the region of interest .

CBCT scanner utilizes a 2D X-ray detector on the opposite side, which allows for
a single rotation of the gantry to generate a scan.

Computer to display the images

Advantages Disadvantages

• Rapid scan time

• Beam limitation

• Image accuracy
• Reduced patient radiation dose

• Interactive display modesapplicable to maxillofacial imaging

Disadvantages

• Extinction artefacts

• Beam hardening artefacts

• Ring artefacts

• Motion artefacts (misalignment artefacts)

Application of CBCT

Implant imaging

orthodontic and orthognathic surgeries

endodontics

Periodontics

TMG diagnosis

Maxillary sinus assessment

Impacted teeth (Third molar and canine)

Views interpretations and Anatomy

There are three 2D views sagittal, coronal and axial , all these 2D views will
reconstructed to form 3D view

Sagittal view Coronal view

Axial view
3D view

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