双源CT大螺距扫描技术在泌尿道造影中的应用  

Application of DSCT with flash scan in computed tomography urogram

作　　者：许轶群[1] 李强[1] 孟名柱[1] 钱农[1] 

机构地区：[1]常州市第二人民医院影像科,江苏省213000

出　　处：《江苏医药》2013年第19期2279-2281,共3页Jiangsu Medical Journal

摘　　要：目的评估双源CT(DSCT)大螺距扫描技术CT泌尿道造影(CTU)的图像质量及辐射剂量。方法疑为泌尿系统病变行CTU检查患者50例,随机均分为两组,采用DSCT行平扫、实质期、排泄期和延迟期四期螺旋扫描。A组的四期均行常规螺旋扫描;B组在延迟期使用DSCT大螺距(3.4mm)扫描。记录A、B两组延迟期辐射剂量:剂量长度乘积(DLP)和CT容积剂量指数(CTDIvol)。采用5分法评估和分析延迟期的图像质量。结果 A组延迟期的DLP为(349.52±86.08)mGycm,CDTIvol为(9.61±1.85)mGy,均明显高于B组的(145.09±18.04)mGycm和(3.54±0.81)mGy(P<0.01)。A、B两组延迟期图像质量评分相仿[(4.38±0.65)分vs.(4.04±0.58)分](P>0.05)。结论与常规螺旋扫描比较,CTU检查的延迟期使用DSCT大螺距扫描模式可大幅度降低辐射剂量,但图像质量相比未见明显降低。Objective To evaluate the image quality and radiation dose in computed tomography urogram（CTU） with dual-source computed tomography（DSCT） flash scanning. Methods CTU with DSCT was performed in 50 patients with suspected urinary system diseases, who were equally assigned into groups of A and B. CT scan included 4 phases of plan scan, nephrographic phase, excretory phase and delay phase. The conventional spiral scanning was used during 4 phases in group A. The flash scanning was carried out in the delay phase in group B. The values of dose lenth product （DLP） and computed tomography volume-dose index（CDTIvol） of delay phase were recorded and compared. The image quality was evaluated by 5-point scoring. Results The values of DLP and CTDIvol of the delay phase in group A were （349.52 ± 86.08） mGycm and （9.61 ± 1.85） mGy, respectively, which were lower than （145.09± 18. 04） mGycm and （3.54±0. 18） mGy in group B （P〈0. 01）. The image quality score of group A and group B was similar [（4.38±0.65） points vs. （4.04 ±0. 58） points] （P〉0. 05）. Conclusion Compared to conventional spiral scanning, flash scanning has an advantage of less dose of radiation with little image quality loss.

关 键 词：泌尿道CT造影 双源CT 大螺距扫描 

分 类 号：R45[医药卫生—治疗学]