摘要
目的探讨在变速注射条件下64层螺旋CT肾动脉造影中使用低剂量对比剂的可行性。资料与方法对10名健康自愿者行腹主动脉(右侧膈顶水平层面)同层动态CT增强扫描,取得主动脉弓时间-密度曲线(time-density curve,TDC),得到触发扫描的理论阈值。将80例临床疑有肾动脉病变的患者按随机分类法分成两个使用不同对比剂注射方法组(A组、B组),每组40例,而后行64层螺旋CT肾动脉造影并记录每公斤体重对比剂用量。每组分别测量腹主动脉及双侧肾动脉CT值进行比较;所得图像按"优、良、差"3级进行评价。结果 B组对比剂用量较A组减少约0.51ml/kg体重,差异有显著统计学意义(Z=-8.231,P<0.01)。两组腹主动脉及双侧肾动脉CT值均>200HU,测量值差异无统计学意义(P>0.05)。肾动脉显像在两组病例中均能达到优或良,合计优良率均为100%(40/40),图像评分方面两组间差异无统计学意义(P>0.05)。结论在变速注射条件下64层螺旋CT肾动脉造影中,使用低剂量对比剂可以获得满意的肾动脉图像。
Objective To investigate the feasibility of 64-slice spiral CT angiography （CTA） with low dose CM for the renal arteries in the different injection condition.Materials and Methods Dynamic CT scan was performed at the same abdominal aorta level in 10 volunteers for measuring the CT value and the theoretical threshold was obtained by the time-density curve （TDC）.CTA of the renal artery were performed on 80 patients suspected with renal artery lesions.80 patients were divided randomly into two groups（A and B,with 40 patients in each group）according to the inject method of CM,and then the dose of CM,CT attenuation values of the abdominal aortic artery （AAA） and bilateral renal arteries （RA） were measured for each group and the image quality was also recorded as excellent,good,and poor.Results The dose of group B was less than group A .CT attenuation values of both the AAA and RA were over 200 HU,and no significant difference between two groups was found.The image quality of renal arteries in two groups was well depicted as excellent or good and also was no significant difference.Conclusion It is feasible to use low dose CM in 64-slice spiral CTA for the renal arteries in the different injection condition.
出处
《临床放射学杂志》
CSCD
北大核心
2011年第2期215-218,共4页
Journal of Clinical Radiology
