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KMID : 0896020070370020093
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Korean Journal of Oral and Maxillofacial Radiology
2007 Volume.37 No. 2 p.93 ~ p.102
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Absorbed and effective dose from newly developed cone beam computed tomography in Korea
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Lee Jong-Nyeong
Han Won-Jeong
Kim Eun-Kyoung
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Abstract
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Purpose : Cone beam computed tomography (CBCT) provides a lower dose and cost alternative to conventional
CT, promising to revolutionize the practice of oral and maxillofacial radiology. The purpose of this study was to
evaluate the absorbed and effective doses of Implagraphy and VCT (Vatech Co., Hwasung, Korea) and compare
them with those of panoramic radiography.
Materials and Methods : Thermoluminescent dosimeter (TLD) chips were placed at 27 sites throughout the layers
of Female ART Head and Neck Phantom for dosimetry. Implagraphy, VCT units, and Planmeca Proline XC
panoramic unit were used for radiation exposures. Radiation weighted doses and effective doses were measured and
calculated using 1990 and 2005 ICRP tissue weighting factors.
Results : Effective doses in Sv (ICRP 2005, ICRP 1990) were 90.19, 61.62 for Implagraphy at maxillay molar area,
123.20, 90.02 for Implagraphy at mandibular molar area, 183.55, 139.26 for VCT and 40.92, 27.16 for panoramic
radiography.
Conclusion : Effective doses for VCT and Implagraphy were only about 2.2 to 4.5 times greater than those for
panoramic radiography. VCT and Implagraphy, CBCT machines recently developed in Korea, showed moderately
low effective doses. (Korean J Oral Maxillofac Radiol 2007; 37 : 93-102)
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KEYWORD
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Dosimetry Tomography, Cone Beam Computed Radiography, Panoramic
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