Zhang Gu-Mu-Yang, Shi Bing, Sun Hao, Xue Hua-Dan, Wang Yun, Liang Ji-Xiang, Xu Kai, Wang Ming, Wang Man, Xu Min, Jin Zheng-Yu
Department of Radiology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Shuaifuyuan No. 1, Wangfujing Street, Dongcheng District, Beijing, 100730, China.
CT Scientific Collaboration, Siemens Healthcare Limited, Shanghai, China.
Abdom Radiol (NY). 2017 Aug;42(8):2127-2134. doi: 10.1007/s00261-017-1103-x.
To evaluate urinary stone detection, radiation exposure, image quality, breathing-motion artifacts, and scanning time with high-pitch tin filter-based abdominopelvic CT.
Sixty-three consecutive patients with urolithiasis underwent non-enhanced abdominopelvic CT with both regular (120 kV, pitch 0.6) and low-dose (Sn150kV, pitch 3.0) protocols on a third-generation dual-source CT. Stone characteristics, image noise (SD), signal-to-noise ratio (SNR), subjective image quality on a 5-point likert scale breathing-motion artifacts, and scanning time were evaluated. Volume CT dose index (CTDIvol), dose-length product (DLP), effective dose (ED) were compared.
A total of 157 urinary stones were detected by regular protocol; 154 were correctly identified by low-dose protocol with an overall detection rate of 98.1%. No significant differences were observed in SD, SNR, or subjective image quality between two protocols (P > 0.05). Compared to regular protocol, CTDIvol and ED were 56.6% (7.19 vs. 3.12 mGy, P < 0.001) and 55.6% (5.25 vs. 2.33 mSv, P < 0.001) lower; scanning time was 89.5% (7.9 vs. 0.83, P < 0.001) shorter; and breathing-motion artifacts were fewer (8 vs. 0 patients) with low-dose protocol.
High-pitch abdominopelvic CT with Sn150kV substantially reduced radiation exposure and scanning time, while maintained stone detection and image quality and prevented breathing-motion artifacts.
评估基于高螺距锡滤过的腹盆部CT在尿路结石检测、辐射暴露、图像质量、呼吸运动伪影及扫描时间方面的表现。
63例连续性尿路结石患者在第三代双源CT上接受常规（120 kV，螺距0.6）和低剂量（Sn150kV，螺距3.0）两种扫描方案的非增强腹盆部CT检查。评估结石特征、图像噪声（SD）、信噪比（SNR）、基于5分李克特量表的主观图像质量、呼吸运动伪影及扫描时间。比较容积CT剂量指数（CTDIvol）、剂量长度乘积（DLP）、有效剂量（ED）。
常规扫描方案共检测到157枚尿路结石；低剂量扫描方案正确识别出154枚，总体检出率为98.1%。两种扫描方案在SD、SNR或主观图像质量方面未观察到显著差异（P>0.05）。与常规扫描方案相比，CTDIvol和ED分别降低了56.6%（7.19 vs. 3.12 mGy，P<0.001）和55.6%（5.25 vs. 2.33 mSv，P<0.001）；扫描时间缩短了89.5%（7.9 vs. 0.83，P<0.001）；低剂量扫描方案的呼吸运动伪影更少（8例 vs. 0例）。
采用Sn150kV的高螺距腹盆部CT可大幅降低辐射暴露和扫描时间，同时保持结石检测能力和图像质量，并减少呼吸运动伪影。
