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首页> 外文期刊>Radiation Protection Dosimetry >COMPARISON BETWEEN 3-D AND z-AXIS AUTOMATIC TUBE CURRENT MODULATION TECHNIQUE IN MULTIDETECTOR-ROW CT
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COMPARISON BETWEEN 3-D AND z-AXIS AUTOMATIC TUBE CURRENT MODULATION TECHNIQUE IN MULTIDETECTOR-ROW CT

机译：多探测器行CT中3-D和z轴自动管电流调制技术的比较

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摘要

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.
机译：在这项研究中，将3-D自动电子管电流调制（3-D ATCM）技术与z轴ATCM技术在多探测器行CT上进行了比较。通过将离子室插入到体模中来进行吸收剂量测量，并且在获得的图像上测量以Hounsfield单位的CT值的标准偏差表示的客观图像噪声。使用带有内部圆柱体模的椭圆圆柱体模，使用3-D ATCM技术与z轴ATCM技术的吸收剂量比率为94.7％，使用没有内部圆柱体模的椭圆圆柱体模，吸收剂量的比例为96.3％。与设置噪声指数相比，3-D ATCM技术和z轴ATCM技术之间的客观噪声差异在可容忍的范围内。因此，与z轴ATCM技术相比，3-D ATCM技术有效地优化了辐射剂量，同时保持了适当的图像质量。

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