SOFTWARE DEVELOPMENT FOR ESTIMATING THE CONVERSION FACTOR (K-FACTOR) AT SUITABLE SCAN AREAS, RELATING THE DOSE LENGTH PRODUCT TO THE EFFECTIVE DOSE

作者：Kobayashi Masanao^*; Asada Yasuki; Matsubara Kosuke; Suzuki Syouichi; Koshida Kichiro; Matsunaga Yuta; Kawaguchi Ai; Haba Tomonobu; Toyama Hiroshi; Kato Ryouichi

来源：Radiation Protection Dosimetry, 2017, 174(4): 565-574.

DOI：10.1093/rpd/ncw256

We developed a k-factor-creator software (kFC) that provides the k-factor for CT examination in an arbitrary scan area. It provides the k-factor from the effective dose and dose-length product by Imaging Performance Assessment of CT scanners and CT-EXPO. To assess the reliability, we compared the kFC-evaluated k-factors with those of the International Commission on Radiological Protection (ICRP) publication 102. To confirm the utility, the effective dose determined by coronary computed tomographic angiography (CCTA) was evaluated by a phantom study and k-factor studies. In the CCTA, the effective doses were 5.28 mSv in the phantom study, 2.57 mSv (51%) in the k-factor of ICRP, and 5.26 mSv (1%) in the k-factor of the kFC. Effective doses can be determined from the kFC-evaluated k-factors in suitable scan areas. Therefore, we speculate that the flexible k-factor is useful in clinical practice, because CT examinations are performed in various scan regions.

• 出版日期2017-5