摘要
目的探讨小剂量对比剂团注测试在CT肺动脉成像(CTPA)中的应用价值。方法将79例诊断为疑似肺动脉栓塞(pulmonary embolism,PE)高危患者,随机分为A、B两组进行CTPA检查,A组:40例,采用增强跟踪触发扫描;B组:39例,采用小剂量对比剂团注测试,在CTPA影像中,2组分别测量肺动脉主干、右上肺静脉和右下肺静脉的CT值,计算肺动脉主干分别与右上肺静脉和右下肺静脉的CT值差,对上腔静脉硬化伪影及CTPA影像评级,进行统计学分析。结果 B组上腔静脉硬化伪影及影像评级优于A组,差异有统计学意义(2=8.709,P=0.013);B组影像质量评级优于A组,差异有统计学意义(2=6.369,P=0.041);肺动脉主干CT值2组间差异没有统计学意义(t=1.380,P>0.05);右上肺静脉CT值、右下肺静脉CT值、肺动脉主干与右上肺静脉的CT值差、肺动脉主干与右下肺静脉的CT值差2组间差异有统计学意义(t值分别为3.882、4.317、-2.710、-3.098,P值均<0.05)。结论在CTPA检查中,应用小剂量对比剂团注测试可以更准确地把握扫描时机,从而获得良好的血管成像质量。
Objective To evaluate the value of small dose injection contrast test （SDCT） in CT pulmonary artery angiog raphy （CTPA）. Methods 79 patients with high risk of pulmonary artery embolism underwent CTPA and were divided randomly into group A, with bolus tracing technique （n=40）, and group B,with SDCT （n =39）, automatic bolus tracking technique. The CT values of the main pulmonary artery （MPA）, right upper pulmonary vein （RUPV） and right lower PV （RLPV） were calculated. The hard beam artifact in the SVC and the total contrast dosage were compared between the two groups. Studenfs t test and Chi-square test were used. Results The contrast artifact of the SVC in group B was significantly less than that in group A （X2 =6. 369, P =0. 041）; The CT values of MPA between the two groups were not significantly different （ t = 1. 380, P 〉0.05）, but the CT values of RUPV, RLPV and the differences of CT values in the MPA and RUPV, MPA and RLPV between the two groups were significant （t values were 3. 882,4. 317, 2. 710 and - 3. 098 respectively, P 〈i0.05）. Conclusion CTPA with SDCT technique can be more accurately grasping the scanning time, so as to achieve good vascular imaging quality.
出处
《医学影像学杂志》
2013年第5期690-693,共4页
Journal of Medical Imaging
