东芝/佳能 CT 系统应用和替代设置下定位片射线摄影的有效剂量和剂量调节效果。

EFFECTIVE DOSE AND EFFECT OF DOSE MODULATION FOR LOCALIZER RADIOGRAPHS USING APPLIED AND ALTERNATIVE SETTINGS ON TOSHIBA/CANON CT SYSTEMS.

机构信息

Centre for Research and Development, Uppsala University/Region Gävleborg, Lasarettsvägen 1, 801 88 Gävle, Sweden.

Department of Imaging and functional medicine, Division diagnostics, Lasarettsvägen 1, Gävle hospital, Region Gävleborg, 801 88 Gävle, Sweden.

出版信息

Radiat Prot Dosimetry. 2021 Oct 12;195(3-4):198-204. doi: 10.1093/rpd/ncab030.

DOI:10.1093/rpd/ncab030

PMID:33851201

Abstract

The purpose was to estimate the effective dose of Toshiba/Canon thorax localizer radiographs for available parameter settings, and to test their dose modulation ability. Localizer radiographs were acquired of anthropomorphic chest phantoms (body mass indices 29 and 23) using various settings (120-80 kV, 100-10 mA). The milliamperes values were compared from resulting helical scan data. Effective dose was computed for two computed tomography (CT) scanners (Aquilion Prime and One Genesis) using a Monte Carlo-based software. For the smaller phantom, all curves were superimposed. For the larger phantom, most curves were also superimposed, except for the one generated from the lowest parameters. The Aquilion Prime system yielded an effective dose of 0.40/0.56 mSv (male/female) using the default parameters. The localizer radiograph dose could be reduced by >90% without affecting the dose modulation. The dose was further reduced by 30-50% in the One Genesis CT system due to improved beam filtration.

摘要

目的是估算东芝/佳能胸部定位器射线照片在现有参数设置下的有效剂量，并测试其剂量调制能力。使用各种设置（120-80 kV、100-10 mA）对人体胸部体模（体重指数为 29 和 23）进行了定位器射线照片拍摄。从得到的螺旋扫描数据中比较了毫安值。使用基于蒙特卡罗的软件为两台计算机断层扫描（CT）扫描仪（Aquilion Prime 和 One Genesis）计算了有效剂量。对于较小的体模，所有曲线都叠加在一起。对于较大的体模，除了来自最低参数的曲线外，大多数曲线也叠加在一起。使用默认参数，Aquilion Prime 系统的有效剂量为 0.40/0.56 mSv（男性/女性）。如果不影响剂量调制，定位器射线照片的剂量可以降低>90%。由于改进了射线过滤，One Genesis CT 系统的剂量进一步降低了 30-50%。