摘要
目的探讨多层螺旋CT肝脏血管成像(MSCTA)的理想成像参数。资料与方法(1)应用Somatom Sensa-tion16螺旋CT扫描仪,对38例患者分别以2.5ml/s(8例),3.5ml/s(15例)、4.5ml/s(15例)注射流率注射碘必乐或优维显(1.5ml/kg体重)行肝脏同层动态增强扫描,测量靶血管及肝实质CT值,描绘时间-密度曲线,确定不同注射流率下肝脏MSCTA各期延迟时间。(2)以方法(1)确定的参数对60例患者(按上述不同注射流率分3组,每组20例)行MSCTA,对不同注射流率所获得的MSCTA图像质量进行评价。结果3组间腹主动脉峰值、门静脉与肝实质的密度差(PV-L)峰值,腹主动脉、门静脉及PV-L达峰时间差异有统计学意义(P<0.05)。3组的动脉期延迟时间分别为28s、24s、19s,门静脉期延迟时间分别为52s、45s、36s,肝实质延迟时间分别为68s、65s、64s。MSCTA图像4.5ml/s组明显优于3.5ml/s组、2.5ml/s组,3.5ml/s组明显优于2.5ml/s组(P<0.05)。4.5ml/s组行MSCTA检查时出现3例对比剂外渗。结论采用3.5ml/s注射流率行肝脏MSCTA,可获得较满意的血管图像。
Objective To discuss the optimal scanning parameters in hepatic angiography using multi-slice CT. Materials and Methods （ 1 ） 38 patients were randomly divided into 3 groups according to different injection rate. Single-level dynamic scan was performed after injection Iopamidol or Ultravist （1.5ml/kg） with a rate of2.5ml/s （8 cases）, 3.5ml/s （15 cases） and 4 .5ml/s （15 cases）. The scan time-density curves （TDC） were obtained by measuring the CT value in the target vessels and liver parenchyma, then the scan delay time was determined by TDC in different phase. （2） 60 patients （who were divided into three groups according to different injection rates mentioned above） were scanned with MSCT, and their hepatic vessels were visualized. MSCTA images of different injection rate were evaluated. Results There were significant differences in the peak of abdominal aorta （AA） and PL among three groups （P 〈 0.05）, the significant differences also existed in the arriving time of AA, PV. The scan delay times of three groups were respectively 28s, 24s, 19s in arterial phase, 52s, 45s, 36s in portal venous phase, and 68s, 65s, 64s in liver parenchyma phase. The imaging quality of MSCTA in the group of 4.5 ml/s was significantly better than that of 3.5 mL/s, and the later was significantly better than that of 2.5 ml/s （ P 〈 0.05 ）. Conclusion Using injection rate of 3.5 ml/s. higher imaging quality of liver MSCTA can be obtained.
出处
《临床放射学杂志》
CSCD
北大核心
2007年第4期376-379,共4页
Journal of Clinical Radiology
