Whole-body CT with high heat-capacity X-ray tube and automated tube current modulation-Effect of tube current limitation on contrast enhancement, image quality and radiation dose

被引:6
作者
Kanematsu, Masayuki [1 ,2 ]
Kondo, Hiroshi [1 ]
Miyoshi, Toshiharu [2 ]
Goshima, Satoshi [1 ]
Noda, Yoshifumi [1 ]
Tanahashi, Yukichi [1 ]
Bae, Kyongtae T. [3 ]
机构
[1] Gifu Univ Hosp, Dept Radiol, Gifu 5011194, Japan
[2] Gifu Univ Hosp, Serv Radiol, Gifu 5011194, Japan
[3] Univ Pittsburgh, Med Ctr, Dept Radiol, Pittsburgh, PA USA
关键词
CT; Whole body; Tube current limitation; Radiation exposure; Image quality; DIAGNOSTIC REFERENCE LEVELS; VOLTAGE; REDUCE; MRI;
D O I
10.1016/j.ejrad.2015.01.019
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
100231 [临床病理学]; 100902 [航空航天医学];
摘要
Purpose: To evaluate the effect of tube current limitation on contrast enhancement, image quality, and radiation dose in whole-body 64-detector CT with a high heat-capacity X-ray tube and automated tube current modulation. Materials and methods: One hundred eighteen patients were randomized into three whole-body CT protocols: tube current limitation at 210 mA, 450 mA, and no limitation. Signal-to-noise ratio (SNR), dose-length product (DLP), estimated effective dose (ED), and image quality were assessed. Results: Mean SNR of aorta was comparable among protocols, but that of liver was somewhat lower in 210-mA than in 450-mA and no-limitation protocols (p < 0.05). Mean DLP with 210-mA (533.8 mGy cm) was reduced by 31% from that with 450-mA (768.4 mGy cm) and by 38% from that with no-limitation protocol (861.3 mGy cm), respectively. Image quality was slightly degraded (p < 0.017) with 210 mA relative to the others in thorax and pelvis, but no difference was found in diagnostic acceptability. Conclusion: For whole-body CT using multidetector CT mounted with a high heat-capacity X-ray tube, an appropriate tube current limitation setting may help reduce excessive radiation dose without significant compromise in diagnostic acceptability. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:877 / 883
页数:7
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