The clinical application of low dose delay scan in MSCTU for urologic disease
ZHU Yu-chun1, XING Wei2, WANG Jian-liang1, SHEN Ji-fang1
1. Department of Radiology, Kunshan Hospital Affiliated to Jiangsu University, Kunshan Jiangsu 215300, China; 2. Department of Radiology, the First People’s Hospital of Changzhou, Changzhou Jiangsu 213003, China)
Abstract：Objective: To discuss the diagnostic value of low dose delay scan(tube voltage 100 kV+CARE Dosed 4D) in multi-slice helical computed tomography urography(MSCTU), and discuss the diagnostic sensitivity of three different post-processing recombinant technologies(MPR/CPR, MIP, VR) in urologic disease. Methods: 34 cases of patients undertook low dose scan protocol in delay phase(100 kV+CARE Dosed 4D). The 1 mm-thick CT data in the delay phase were restructed by post-processing technology and compared with clinical and pathological diagnosis. Results: In 34 cases of patients, the accuracy of localization and qualitative diagnosis of MSCTU image was 97.1%(33/34) and 91.2%(31/34), respectively. The localization and qualitative diagnostic sensitivity in three different image combinations from high to low was as follows: MSCTU image>CT axial combined with delay image>routine CT axial, and the diagnostic accuracy of localization was higher than the qualitative diagnosis. There was statistically significant difference(P<0.012 5) between MSCTU image and routine CT axial, but not for the rest of the combinations(P>0.012 5). Meanwhile, the localization and qualitative diagnostic sensitivity in three different image post-processing technologies from high to low was as follows: MPR/CPR>MIP>VR. There were statistical significant differences(P=0.000) between MPR/CPR and MIP or VR technology, while not between MIP and VR(P>0.012 5). Conclusion: MSCTU using 100 kV with CARE Dosed 4D technology in excretory phase can not only reduce radiation dose in single phase, but also have higher diagnostic accuracy in localization and qualitative diagnosis. The low dose scan protocol is worth to be widely applied in the clinic of urologic disease.
2015, Vol. 26 
