Matsubara K, Koshida K, Suzuki M, Tsujii H, Yamamoto T, Matsui O
Department of Radiological Technology, Kanazawa University Hospital, 13-1 Takaramachi, Kanazawa, Ishikawa, Japan.
Radiat Prot Dosimetry. 2008;128(1):106-11. doi: 10.1093/rpd/ncm384. Epub 2007 Aug 6.
In this study, the 3-D automatic tube current modulation (3-D ATCM) technique was compared with the z-axis ATCM technique on multidetector-row CT. Absorbed dose measurements were performed by inserting an ion chamber into the phantoms, and objective image noise shown as the standard deviation of CT value in Hounsfield units was measured on the obtained images. The ratio of absorbed doses with 3-D ATCM technique to z-axis ATCM technique was 94.7% using an elliptical cylinder phantom with an inner cylinder phantom and 96.3% using an elliptical cylinder phantom without an inner cylinder phantom. Differences in objective noise between the 3-D ATCM technique and z-axis ATCM technique were within a tolerable range compared with the setting noise index. Therefore, the 3-D ATCM technique effectively optimises the radiation dose, while maintaining an appropriate image quality compared with z-axis ATCM technique.
在本研究中，在多排探测器CT上对三维自动管电流调制（3-D ATCM）技术与z轴ATCM技术进行了比较。通过将电离室插入体模中来进行吸收剂量测量，并在获得的图像上测量以亨氏单位表示的CT值标准差形式的客观图像噪声。使用带有内圆柱模体的椭圆圆柱体模体时，3-D ATCM技术与z轴ATCM技术的吸收剂量比为94.7%，使用没有内圆柱模体的椭圆圆柱体模体时为96.3%。与设定噪声指数相比，3-D ATCM技术和z轴ATCM技术之间的客观噪声差异在可接受范围内。因此，与z轴ATCM技术相比，3-D ATCM技术在保持适当图像质量的同时有效地优化了辐射剂量。
Zotero 插件