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. 2012 Jun;42(2):65-70.
doi: 10.5624/isd.2012.42.2.65. Epub 2012 Jun 25.

Comparison of effective dose for imaging of mandible between multi-detector CT and cone-beam CT

Dae-Kyo Jeong  1 , Sang-Chul Lee, Kyung-Hoe Huh, Won-Jin Yi, Min-Suk Heo, Sam-Sun Lee, Soon-Chul Choi
Affiliations

Comparison of effective dose for imaging of mandible between multi-detector CT and cone-beam CT

Dae-Kyo Jeong et al. Imaging Sci Dent. 2012 Jun.

Abstract

Purpose: The aim of this study was to compare the effective dose for imaging of mandible between multi-detector computed tomography (MDCT) and cone-beam computed tomography (CBCT). An MDCT with low dose technique was also compared with them.

Materials and methods: Thermoluminescent dosimeter (TLD) chips were placed at 25 organ sites of an anthropomorphic phantom. The mandible of the phantom was exposed using 2 different types of MDCT units (Somatom Sensation 10 for standard-dose MDCT, Somatom Emotion 6 for low-dose MDCT) and 3 different CBCT units (AZ3000CT, Implagraphy, and Kavo 3D eXaM). The radiation absorbed dose was measured and the effective dose was calculated according to the ICRP 2007 report.

Results: The effective dose was the highest for Somatom Sensation 10 (425.84 µSv), followed by AZ3000CT (332.4 µSv), Somatom Emotion 6 (199.38 µSv), and 3D eXaM (111.6 µSv); it was the lowest for Implagraphy (83.09 µSv). The CBCT showed significant variation in dose level with different device.

Conclusion: The effective doses of MDCTs were not significantly different from those of CBCTs for imaging of mandible. The effective dose of MDCT could be markedly decreased by using the low-dose technique.

Keywords: Cone-Beam Computed Tomography; Mandible; Multidetector Computed Tomography; Thermoluminescent Dosimetry.

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Figures

Fig. 1
Fig. 1
Alderson radiation therapy phantom.
Fig. 2
Fig. 2
Thermoluminescent dosimeter (TLD) chips are inserted into each of the organ structures.
See this image and copyright information in PMC

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