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KMID : 1024020120420020065
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Imaging Science in Dentistry
2012 Volume.42 No. 2 p.65 ~ p.70
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Comparison of effective dose for imaging of mandible between multi-detector CT and cone-beam CT
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Jeong Dae-Kyo
Lee Sang-Chul
Huh Kyung-Hoe
Yi Won-Jin
Heo Min-Suk
Lee Sam-Sun
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Abstract
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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.
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KEYWORD
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Multidetector Computed Tomography, Cone-Beam Computed Tomography, Thermoluminescent Dosimetry, Mandible
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