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Image artifact in dental cone-beam CT.

Akitoshi Katsumata¹, Akiko Hirukawa, Marcel Noujeim

¹Department of Oral Radiology, Asahi University School of Dentistry, Gifu, Japan. kawamata@dent.asahi-u.ac.jp

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics

|April 25, 2006

Summary

An artifact in limited-volume cone-beam CT imaging appears as arch-shaped defects. This imaging artifact is likely caused by halation from the image intensifier system, especially at higher voltages.

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Area of Science:

Radiological imaging
Medical physics
Dental imaging technology

Background:

Limited-volume cone-beam CT (CBCT) is crucial for dental and maxillofacial imaging.
Artifacts can compromise diagnostic accuracy in CBCT scans.
Understanding artifact origins is key to improving image quality.

Purpose of the Study:

To investigate the visual characteristics of a specific artifact in limited-volume CBCT.
To determine the potential cause of this observed artifact.

Main Methods:

A phantom simulating head anatomy was used.
A bone-equivalent test object was imaged at various positions within the phantom.
Cone-beam CT images were acquired using a 3DX Accuitomo system.

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Main Results:

Arch-shaped defects were observed when the test object was near the phantom's margin.
A negative correlation existed between artifact size and the object's CT value.
Higher scanning voltages resulted in larger artifacts.

Conclusions:

The artifact's appearance and behavior suggest a link to the imaging intensifier (II) system.
Halation from the II system is proposed as the probable cause of the observed artifact.