Kawauchi Satoru, Chida Koichi, Moritake Takashi, Matsumaru Yuji, Hamada Yusuke, Sakuma Hideyuki, Yoda Shogo, Sun Lue, Sato Masayuki, Tsuruta Wataro
Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan.
Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba, Sendai, Miyagi, Japan.
Radiat Prot Dosimetry. 2019 Aug 1;184(2):138-147. doi: 10.1093/rpd/ncy188.
The purpose of this study was to investigate the dose distribution and lens doses associated with C-arm cone-beam computed tomography (CBCT), using a head phantom, and to estimate the contribution ratio of C-arm CBCT to each patient's lens dose during interventional neuroradiology ('lens dose ratio') in 109 clinical cases. In the phantom study, the peak skin doses and respective right and left lens doses of C-arm CBCT were as follows: 63.0 ± 1.9 mGy, 19.7 ± 1.4 mGy and 21.9 ± 0.8 mGy in whole brain C-arm CBCT and 39.2 ± 1.4 mGy, 4.7 ± 0.9 mGy and 3.6 ± 0.3 mGy in high-resolution C-arm CBCT. In the clinical study, the lens dose ratios were 25.4 ± 8.7% in the right lens and 19.1 ± 9.8% in the left lens. This study shows that, on average, ~25% of patients' total lens dose was contributed by C-arm CBCT.
本研究的目的是使用头部模型，研究与C形臂锥束计算机断层扫描（CBCT）相关的剂量分布和晶状体剂量，并估计109例临床病例中，介入神经放射学期间C形臂CBCT对每位患者晶状体剂量的贡献率（“晶状体剂量比”）。在模型研究中，C形臂CBCT的皮肤峰值剂量以及左右晶状体各自的剂量如下：全脑C形臂CBCT为63.0±1.9 mGy、19.7±1.4 mGy和21.9±0.8 mGy，高分辨率C形臂CBCT为39.2±1.4 mGy、4.7±0.9 mGy和3.6±0.3 mGy。在临床研究中，右晶状体的晶状体剂量比为25.4±8.7%，左晶状体为19.1±9.8%。本研究表明，平均而言，C形臂CBCT贡献了患者晶状体总剂量的约25%。
