이동형 구내방사선촬영기로 촬영한 치근단 방사선촬영과 파노라마방사선촬영의 흡수선량과 유효선량 평가

Purpose : The purpose of this study was to measure the absorbed dose and to calculate the effective dose for full-mouth periapical radiography using the portable dental x-ray machine and panoramic radiography Material and Method : Thermoluminescent chips were placed at 25sites throughout the layers of the head and neck of a tissueequivalent human skull phantom. The man phantom was exposed with the portable dental x-ray machine and panoramic unit. During full-mouth periapical radiography the exposure setting was 60 ㎸p, 2 ㎃ and 0.15 ~ 0.25 seconds, while during panoramic radiography the selected exposure setting was 72 ㎸p, 8 ㎃ and 18 seconds. Absorbed dose measurements were obtained and equivalent doses to individual organs were summed using ICRP 103 to calculate of effective dose. Result : In the full-mouth periapical radiography, the highest absorbed dose was recorded at the mandible body follow with submandibular glands and cheek. Using panoramic unit, the highest absorbed dose was parotid glands and the following was back of neck and submandibular glands. The effective dose in full-mouth periapical radiography using portable dental x-ray machine was 46 Sv. In panoramic radiography, the effective dose was 38 Sv. Conclusion : It was recommended to panoramic radiography for general check in the head and neck area because that the effect dose in the panoramic radiography was lower than the dose in the full-mouth periapical radiography using portable dental x-ray machine.