Nemoto Manami, Chida Koichi
Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Miyagi, Japan.
Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai 980-0845, Miyagi, Japan.
Diagnostics (Basel). 2020 Sep 25;10(10):753. doi: 10.3390/diagnostics10100753.
Full-spinal radiographs (FRs) are often the first choice of imaging modality in the investigation of scoliosis. However, FRs are strongly related to breast cancer occurrence due to multiple large-field radiographic examinations taken during childhood and adolescence, which may increase the risk for breast cancer in adulthood among women with scoliosis. The purpose of this study was to consider various technical parameters to reduce the patient radiation dose of FRs for scoliosis. To evaluate breast surface doses (BSDs) in FRs, radio photoluminescence dosimeters were placed in contact with a child phantom. Using the PC-based Monte Carlo (PMC) program for calculating patient doses in medical X-ray examinations, the breast organ dose (BOD) and the effective dose were calculated by performing Monte Carlo simulations using mathematical phantom models. The BSDs in the posteroanterior (PA) view were 0.15-0.34-fold those in the anteroposterior (AP) view. The effective dose in the PA view was 0.4-0.61-fold that in the AP view. BSD measurements were almost equivalent to the BODs obtained using PMC at all exposure settings. During FRs, the PA view without an anti-scatter grid significantly reduced the breast dose compared to the AP view with an anti-scatter grid.
全脊柱X线片（FRs）通常是脊柱侧弯检查中首选的成像方式。然而，由于在儿童期和青少年期进行多次大视野X线检查，FRs与乳腺癌的发生密切相关，这可能会增加脊柱侧弯女性成年后患乳腺癌的风险。本研究的目的是考虑各种技术参数，以降低用于脊柱侧弯的FRs的患者辐射剂量。为了评估FRs中的乳房表面剂量（BSDs），将放射光致发光剂量计与儿童体模接触放置。使用基于PC的蒙特卡罗（PMC）程序计算医学X线检查中的患者剂量，通过使用数学体模模型进行蒙特卡罗模拟来计算乳房器官剂量（BOD）和有效剂量。后前位（PA）视图中的BSDs是前后位（AP）视图中的0.15 - 0.34倍。PA视图中的有效剂量是AP视图中的0.4 - 0.61倍。在所有曝光设置下，BSDs测量值几乎与使用PMC获得的BODs相等。在FRs期间，与使用防散射栅格的AP视图相比，不使用防散射栅格的PA视图显著降低了乳房剂量。
