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KMID : 0896020070370020087
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Korean Journal of Oral and Maxillofacial Radiology
2007 Volume.37 No. 2 p.87 ~ p.92
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Radiation absorbed doses of cone beam computed tomography
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Lee Eui-Tae
Kim Gyu-Tae
Choi Yong-Suk
Hwang Eui-Hwan
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Abstract
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Purpose : To measure the absorbed doses of cone beam computed tomography (CBCT), which is recently being more frequently used, and to compare them with those of panoramic radiography.
Materials and Methods : To measure the absorbed doses of CBCT (PSR-9000NTM, Asahi Roentgen Ind. Co.,
Japan), we placed TLD chips on the skin regions above the parotid and thyroid glands, and on the dorsum of tongue
in a dental head phantom. We used two image acquisition modes of the Dental and Panoramic modes of CBCT,
which differed in the field of view. Also, panoramic radiographs (Auto IIIN, Asahi Roentgen Ind. Co., Japan) were
taken to compare with the absorbed doses of CBCT.
Result : In the Dental mode of CBCT, the absorbed doses of the parotid gland, dorsum of tongue, and thyroid gland were 3.53, 3.13, and 0.36 mGy, respectively. In the Panoramic mode of CBCT, they were 9.57, 9.15, and 0.85 mGy,
respectively. The panoramic mode showed higher absorbed doses than those of the Dental mode. In the panoramic
radiography, the absorbed doses of the parotid gland, dorsum of tongue, and thyroid gland were 1.21, 1.19, and 0.16
mGy, respectively. And they were about 1/3 of the Dental mode and 1/9 of the Panoramic mode of CBCT.
Conclusion : Absorbed doses of CBCT are higher than those of panoramic radiography, and dependent upon the
field of view. (Korean J Oral Maxillofac Radiol 2007; 37 : 87-92)
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KEYWORD
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Tomography, Cone Beam Computed Radiography, Panoramic Radiation Dosage
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