Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines

Boulos Bechara; Clyde A McMahan; William S Moore; Marcel Noujeim; Hassem Geha; Fabricio B Teixeira

doi:10.2334/josnusd.54.227

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Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines

Journal article

Open access

Peer reviewed

Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines

Boulos Bechara, Clyde A McMahan, William S Moore, Marcel Noujeim, Hassem Geha and Fabricio B Teixeira

Journal of oral science, Vol.54(3), pp.227-232

09/2012

DOI: 10.2334/josnusd.54.227

PMID: 23047033

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Abstract

Each of three cone beam computed tomography (CBCT) machines offer a small field of view (FOV); Promax, Accuitomo 3D, and Kodak 9000. The objectives were to determine, when using a small FOV, the difference in contrast-to-noise ratios (CNR) of images obtained from different machines and different scan settings within each machine. A phantom made of a dry mandible with an epoxy resin based substitute (ERBS) block was used. The ERBS block was fixed to the lingual cortex in the posterior left mandible. Water was used to simulate soft tissue. Twenty scans were acquired. CNR was calculated as the difference in density of the ERBS block and a control area divided by the standard deviation of the difference. The CNR obtained from images acquired with the Promax machine (voxel size of 0.2 mm) was higher than the other machines (voxel sizes 0.076, 0.08, or 0.125 mm) when using a small FOV. The Accuitomo 360° scan had higher CNR than the Accuitomo 180° scan due to the doubling of the number of basis images acquired. Smaller voxel size does not necessarily lead to enhanced CNR. Increasing the number of basis images did increase the CNR.

Cone-Beam Computed Tomography - instrumentation

Tomography Scanners, X-Ray Computed

Humans

Signal-To-Noise Ratio

Mandible - diagnostic imaging

Cone-Beam Computed Tomography - methods

Phantoms, Imaging

Details

Title: Subtitle: Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines
Creators: Boulos Bechara - Department of Oral and Maxillofacial Radiology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229-3900, USA. boulosbchara@hotmail.com
Clyde A McMahan
William S Moore
Marcel Noujeim
Hassem Geha
Fabricio B Teixeira
Resource Type: Journal article
Publication Details: Journal of oral science, Vol.54(3), pp.227-232
Publisher: Japan
DOI: 10.2334/josnusd.54.227
PMID: 23047033
ISSN: 1343-4934
eISSN: 1880-4926
Language: English
Date published: 09/2012
Academic Unit: Endodontics
Record Identifier: 9984065808902771

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