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방사선촬영에서 면적선량 및 새로운 실질면적선량 개념의 비교 평가

Comparative Evaluation of Kerma Area Product and New Fundamental of Kerma Area Product on Radiography

방사선기술과학 2021년 44권 1호 p.53 ~ 58
최우철, 김용민, 김정수,
소속 상세정보
최우철 ( Choi Woo-Cheol ) - Daegu Catholic University Department of Radiological Science
김용민 ( Kim Yong-Min ) - Daegu Catholic University Department of Radiological Science
김정수 ( Kim Jung-Su ) - Daegu Health College Department of Radiologic Technology

Abstract


Kerma Area Product (KAP) is best indicator of radiation monitoring on radiographic examinations. KAP can be measured differently depending on the X-ray irradiation area, air kerma, souce-skin distance, type of equipment, etc. The major factors are exposure area and the air krema. The KAP currently used only considers the exposure area with X-rays and has a problem that KAP is always excessively overestimated from the dose received by an actual subject. Therefore, in this study, in order to measure the accurate KAP, a new area dose calculation that can be calculated by dividing the area where the actual X-ray is irradiated is presented, and the KAP is the real area. We compared and analyzed how much it was overestimated compared to the dose. The Skull AP projection and seven other projection were compared and analyzed, and the KAP was overestimated in each test by 52% to 60%. In this way, the effective KAP (EKAP) calculation developed through this study should be utilized to prevent extra calculation of the existing KAP, and only the accurate patient subject area should be calculated to derive the accurate area dose value. EKAP is helpful for control the patient's exposure dose more finely, and it is useful for the quality control of medical radiation exposure.

키워드

면적선량; 실질면적선량; 환자피폭선량; 방사선촬영; 품질관리
Kerma Area Product; Effective Kerma Area Product; Patient radiation exposure; Radiography; Quality Control

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