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Original Article

Korean Journal of Medical Physics 2010; 21(2): 137-144

Published online June 25, 2010

Copyright © Korean Society of Medical Physics.

Reducing of Craniofacial Radiation Dose Using Automatic Exposure Control Technique in the 64 Multi-Detector Computed Tomography

64 다중 검출기 전산화단층촬영에서 관전류 자동노출조절 기법을 이용한 두개부 방사선량 감소 정도 평가

Youl-Hun Seoung*, Yong-Ok Kim, Bo-Young Choe*

성열훈*ㆍ김영옥ㆍ최보영*

*Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Department of Radiological Science, Daewon University College, Jecheon, Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea

*가톨릭대학교 의과대학 의공학교실 생체의공학연구소, 대원대학 방사선과, 분당서울대학교병원 영상의학과

Abstract

The purpose of this study was to evaluate the usefulness of reducing of craniofacial radiation dose using automatic exposure control (AEC) technique in the 64 multi-detector computed tomography (MDCT). We used SOMATOM Definition 64 multi-detector CT, and head of whole body phantom (KUPBU-50, Kyoto Kagaku CO. Ltd). The protocol were helical scan method with 120 kVp, 1 sec of rotation time, 5 mm of slice thickness and increment, 250 mm of FOV, 512×512 of matrix size, 64×0.625 mm of collimation, and 1 of pitch. The evaluation of dose reducing effect was compared the fixed tube current of 350 with AEC technique. The image quality was measured the noise using standard deviation of CT number. The range of craniofacial bone was to mentum end from calvaria apex, which devided three regions: calvaria∼superciliary ridge (1 segment), superciliary ridge∼acanthion (2 segment), and acanthion∼mentum (3 segment). In the fixed tube current technique, CTDIvol was 57.7 mGy, DLP was 640.2 mGyㆍcm in the all regions. The AEC technique was showed that 1 segment were 30.7 mGy of CTDIvol, 340.7 mGyㆍcm of DLP, 2 segment were 46.5 mGy of CTDIvol, 515.0 mGyㆍcm of DLP, and 3 segment were 30.3 mGy of CTDIvol, 337.0 mGyㆍcm of DLP. The standard deviation of CT number was 2.622 with the fixed tube current technique and 3.023 with the AEC technique in the 1 segment, was 3.118 with the fixed tube current technique and 3.379 with the AEC technique in the 2 segment, was 2.670 with the fixed tube current technique and 3.186 with the AEC technique in the 3 segment. The craniofacial radiation dose using AEC Technique in the 64 MDCT was evaluated the usefulness of reducing for the eye, the parotid and thyroid with high radiation sensitivity particularly.

KeywordsMulti-detector computed tomography (MDCT), Craniofacial radiation dose, Automatic exposure control (AEC)

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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