조사야에 따른 cone-beam computed tomography의 흡수선량 비교
Comparison of absorbed doses of cone-beam computed tomography according to field of view
서요섭, 김재덕, 김진수,
소속 상세정보
서요섭 ( Seo Yo-Seob ) - 조선대학교 치의학전문대학원 구강악안면방사선학교실
김재덕 ( Kim Jae-Duk ) - 조선대학교 치의학전문대학원 구강악안면방사선학교실
김진수 ( Kim Jin-Soo ) - 조선대학교 치의학전문대학원 구강악안면방사선학교실
KMID : 0353320130370010039
Abstract
Purpose: To compare absorbed doses of cone-beam computed tomography (CBCT) according to field of view (FOV).
Materials and Methods: To measure the absorbed doses of CBCT (Hitachi Medical Co.), we placed thermoluminescent dosimeter chips on both the submandibular and parotid glands, esophagus, tongue, and thyroid gland in a dental head phantom (CIRS). We used three image acquisition modes with FOV of different size: panoramic mode (P mode), implant mode (I mode), and dental mode (D mode). Two different dental mode scans were performed. One scanned the right upper molar region (D1), whereas the other scanned the left lower molar region (D2).
Results: Average absorbed doses was lowest in D mode (average of D1 and D2, 4272.1 μGy) (p<0.05). Although the averages of absorbed doses between D1 and D2 showed no significant difference (p>0.05), the absorbed doses of esophagus (D1 756.9 μGy, D2 2938.2 μGy) and thyroid gland (D1 344.6 μGy, D2 880.1 μGy) were significantly different between D1 and D2.
Conclusion: Since the average of absorbed doses was lowest with the smallest FOV, we must try to select the lowest FOV as possible when performing computed tomography, followed by careful diagnosis.
키워드
Thermoluminescent dosimetry; cone-beam computed tomography; Radiation dosage
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