Hsieh Chih-Chuan, Li Chiao-Zhu, Lin Meng-Chi, Yang Yun-Ju, Hong Kun-Ting, Chen Yi-Hsun, Syu Zih-Hsian, Ju Da-Tong
Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
Department of Surgery, Zoying Branch, Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan.
Health Phys. 2018 Aug;115(2):275-280. doi: 10.1097/HP.0000000000000869.
This study aims to compare the effect of Philips' Brilliance 64-slice and 256-slice (multislice) computed tomography on effective doses when changing the operating parameters for simulated examinations of patients' spine tumors, including changes in pitch, tube voltage (kV), and effective tube current-time product (mA s). This study considers the possibility of using other probable operating conditions to reduce patients' effective doses. The absorbed doses to organs and skin are measured by taking data from thermoluminescent dosimeters (GR-200 and GR-200F) in relevant positions on the anthropomorphic Rando phantom. We also used an American College of Radiology computed tomography accreditation phantom to experiment with image spatial resolution under various scan conditions in order to achieve results over 5 line pairs per cm, the analytical capability required to meet diagnostic needs. The results show that, in general, when we change the pitch, effective tube current-time product, and tube voltage, the effective doses from 256-slice computed tomography exceed those from 64-slice computed tomography.
本研究旨在比较飞利浦64排和256排（多层）计算机断层扫描在改变模拟患者脊柱肿瘤检查的操作参数时对有效剂量的影响，这些参数包括螺距、管电压（kV）和有效管电流-时间乘积（mAs）。本研究考虑了使用其他可能的操作条件来降低患者有效剂量的可能性。通过从热释光剂量计（GR-200和GR-200F）获取人体模型Rando体模相关位置的数据来测量器官和皮肤的吸收剂量。我们还使用了美国放射学会计算机断层扫描认证体模，在各种扫描条件下对图像空间分辨率进行实验，以获得超过每厘米5线对的结果，这是满足诊断需求所需的分析能力。结果表明，一般来说，当我们改变螺距、有效管电流-时间乘积和管电压时，256排计算机断层扫描的有效剂量超过64排计算机断层扫描的有效剂量。
