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

Boulos Bechara, Clyde A. McMahan, William Moore, Marcel E Noujeim, Hassem Geha, Fabricio B. Teixeira

Research output: Contribution to journalArticle

26 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)227-232
Number of pages6
JournalJournal of oral science
Volume54
Issue number3
StatePublished - Sep 2012
Externally publishedYes

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Cone-Beam Computed Tomography
Noise
Epoxy Resins
Mandible
Tongue
Water

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Bechara, B., McMahan, C. A., Moore, W., Noujeim, M. E., Geha, H., & Teixeira, F. B. (2012). Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines. Journal of oral science, 54(3), 227-232.

Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines. / Bechara, Boulos; McMahan, Clyde A.; Moore, William; Noujeim, Marcel E; Geha, Hassem; Teixeira, Fabricio B.

In: Journal of oral science, Vol. 54, No. 3, 09.2012, p. 227-232.

Research output: Contribution to journalArticle

Bechara, B, McMahan, CA, Moore, W, Noujeim, ME, Geha, H & Teixeira, FB 2012, 'Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines.', Journal of oral science, vol. 54, no. 3, pp. 227-232.
Bechara, Boulos ; McMahan, Clyde A. ; Moore, William ; Noujeim, Marcel E ; Geha, Hassem ; Teixeira, Fabricio B. / Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines. In: Journal of oral science. 2012 ; Vol. 54, No. 3. pp. 227-232.
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