Evaluation of Absorbed Dose and Skin Dose with MDCT Using Ionization Chamber and TLD

Kyung Soo Jeon; Young Kee Oh; Jong Geun Baek; Ok Bae Kim; Jin Hee Kim; Tae Jin Choi; Dong Hyeok Jeong; Jeong Kee Kim

doi:10.14316/pmp.2013.24.1.35

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Jeon, Oh, Baek, Kim, Kim, Choi, Jeong, and Kim: Evaluation of Absorbed Dose and Skin Dose with MDCT Using Ionization Chamber and TLD

Original Article

Progress in Medical Physics 2013;24(1):35-40.

Published online: 20 March 2013

DOI: https://doi.org/10.14316/pmp.2013.24.1.35

Evaluation of Absorbed Dose and Skin Dose with MDCT Using Ionization Chamber and TLD

Kyung Soo Jeon^∗, Young Kee Oh^∗, Jong Geun Baek^∗,^‡, Ok Bae Kim^∗, Jin Hee Kim^∗, Tae Jin Choi^†, Dong Hyeok Jeong^§,, Jeong Kee Kim^§

^∗Department of Radiation Oncology, Korea

^†Biomedical Engineering, College of Medicine, Keimyung University, Daegu, Korea

^‡Department of Physics, College of Science, Yeungnam University, Kyungsan, Korea

^§Research Center, Dongnam Inst. Radiological and Medical Sciences, Busan, Korea

책임저자：오영기, (700-712) 대구시 중구 동산동 194 계명대학교 동산의료원 방사선종양학과 Tel: 053)250-7683, Fax: 053)250-7984 E-mail: ykoh@dsmc.or.kr

Received 8 June 2012 Accepted 4 March 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Recently, the uses of Multi-Detector Computed Tomography (MDCT) for radiation treatment simulation and planning which is used for intensity modulated radiation therapy with high technique are increasing. Because of the increasing uses of MDCT, additional doses are also increasing. The objective of this study is to evaluate the absorbed dose of body and skin undergoing in MDCT scans. In this study, the exposed dose at the surface and the center of the cylindrical water phantom was measured using an pencil ionization chamber, 30 cc ionization chamber and TL Powder. The results of MDCT were 31.84 mGy, 33.58 mGy and 32.73 mGy respectively. The absorbed dose at the surface showed that the TL reading value was 33.92 mGy from MDCT. These results showed that the surface dose was about 3.5% from the MDCT exposure higher than a dose which is located at the center of the phantom. These results mean that the total exposed dose undergoing MDCT 4 times (diagnostic, radiation therapy planning, follow-up et al.), is about 14 cGy, and have to be considered significantly to reduce the exposed dose from CT scan.

Keywords: MDCT, CTDI, Pencil ion chamber, 30 cc ion-chamber, TLD

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