目的探讨和分析尿路梗阻患 者应用低辐射和低剂量对比剂MSCTU的 效果。方法 选取我院2012年1月-2013年 12月期间收治的120例尿路梗阻患者进行 研究。按照CT扫描管电流不同分组为常 规剂量组(190-260mA)和100mA组及80mA 组。并采用螺旋CT进行扫描。100mA组、 80mA组：扫描前，经患者肘正中静脉一 次性推注20ml对比剂，15min后再进行排 泄期扫描。常规组：采用高压注射器经 患者肘正中静脉注射80ml造影剂，注射 速度为3-3.5ml/s，然后对患者进行腹部 常规三期扫描和排泄期扫描，并研究排 泄期图像。扫描结束后，需分别进行MPR 和VR及MIP、CRP重建。并选择常规组图 像为标准来评价其他两组图像质量。结 果 经研究发现，三组在输尿管和肾脏上 段横断面图像及全泌尿系统MIP和VR图 像比较(P>0.05)。而80mA组与常规组、 80mA组与100mA组两两比较，其输尿管 中下段横断面图像和MPR及CRP图像比较 (P<0.05)。然膀胱横断面图像：80mA组与 100mA组比较(P>0.05)；80mA组与常规组 比较(P<0.05)。结论 临床诊断尿路梗阻 时，当将管电流降到80mA，对比剂为20ml 时，采用MSCTU能对患者中上段输尿管和 肾集合系统梗阻做出准确准备。然管电流 为100mA，对比剂为20ml时，其图像更为 清晰，则可对全尿路梗阻做出准确诊断结 果。

Objective Discussion and analysis of urinary tract obstruction in patients with low radiation and the effect of low dose contrast agent MSCTU. Methods Select our hospital from January 2012 to December 2012, admitted during the period of 120 patients with urinary tract obstruction were studied. According to different grouped into conventional CT tube current dose group (190-260 ma) and 190 ma and 80 ma group. Using spiral CT scanning. 100 ma and 80 ma group: scan before, through the center of the elbow vein in patients with one-time push 20 ml contrast medium injection, discharge phase scanning of the reentry after 15 min. Routine group: patients with high pressure injector in the center of the elbow intravenous 80 ml contrast agent, the injection rate of 3-3.5 ml/s, and in patients with abdominal conventional three phase scanning and discharge phase scanning, and study the discharge images. After the scanning, need for MPR and VR and MIP, CRP, reconstruction. Group and select the conventional image as a standard to evaluate the other two groups of image quality. Results The study found that three groups all period of cross-sectional images and ureter and kidney in urinary system MIP and VR images comparison (P>0.05). And 80 ma group and routine group, 80 ma and 100 ma set of pairwise comparison, the ureter middle period of cross-sectional images and MPR and CRP image comparison (P<0.05). However, bladder crosssectional images: 80 ma and 100 ma group comparison (P>0.05); 80 ma group compared with normal group (P<0.05). Conclusion Clinical diagnosis of urinary tract obstruction, when will the tube current to 80 ma, contrast medium to 20 ml, can be on patients with MSCTU accurately upper segment ureteral obstruction and renal collecting system. But tube current is 100 ma, contrast medium for 20 ml, its image is more clear, can make accurate diagnosis to the urinary tract obstruction.