摘要
目的：对照ＴＯＦ法和ＰＣ法ＭＲＡ的脑血管成像效果及各级脑血管的显示率。材料和方法：采用２０个随机病例，同时作脑血管的ＴＯＦ法和ＰＣ法磁共振血管造影，进行自身对照，分级评价两种成像方法对于各级脑血管的成像效果并计算显示率，结果进行统计学处理。结果：大脑前动脉Ａ１段、Ａ２３段ＰＣ法和ＴＯＦ法的显示率无显著差异（Ｐ＞０．０５），Ａ４段ＰＣ法的显示率高于ＴＯＦ法（Ｐ＜０．００５），分别为９５％和７０％。大脑中动脉Ｍ１段及Ｍ２３段ＰＣ法和ＴＯＦ法的显示率无显著性差异（Ｐ＞０．０５）；Ｍ４－５段的ＰＣ法显示率（８５％）明显高于ＴＯＦ法（４０％）（Ｐ＜０．００５）。大脑后动脉Ｐ１、Ｐ２－３段ＰＣ法与ＴＯＦ法两者的显示率无显著差异；Ｐ４５段ＰＣ法的显示率（８５％）明显高于ＴＯＦ法（５７．５％）（Ｐ＜０．００５）。大脑前交通动脉和后交通动脉两种方法显示率均较低，无显著差异。其中Ａ２３段、Ｍ２３段及Ｐ２３段，虽然两者的显示率无明显差异，但用秩和检验比较两者的分级显示效果（ＩＩＶ级）仍有显著差异，ＰＣ法优于ＴＯＦ法。结论：ＰＣ法对于细小血管的显示率及显示效果均优于ＴＯＦ法，ＴＯＦ法背景信号抑制差、饱和伪影较大、对慢?
Purpose:To compare the sensitivities(detection rates) and the different grades value of 3D-PC MRA and 3D-TOF MRA in the evaluation of cerebral arteries.Materials and Methods:The results of 20 cases undergone both 3D-PC MRA and 3D-TOF MRA examintions were compared in a blinded fashion.Chi Square Test and Rank Sum Test were used in the analysis of sensitivities and ranked resolution values,respectively. Results:No significant difference was found between the detection rate of the two techniques for the arterial segments of A1,A23,M1,M23,P1,P23.The detection rate of 3D_PC MRA for thesegments of A4(A5 not included in the scan slab),M45 and P45 were significantly higher than that of 3D-TOF MRA (P<0.005).Also,the ranked resolution value of 3D-PC MRA for the segments of A23,A4,M23,M45,P23and P45,were significantly higher than that of 3D-TOF MRA .Conclusion:3D-PC MRA and 3D-TOF MRA has similar sensitivity(detection rate) and ranked resolution value in the evaluation of the main stems of cerebral arteries .For the small branches,3D-PC MRA has a higher sensitivity and higher resolution value compared to 3D-TOF MRA .
出处
《中国医学计算机成像杂志》
CSCD
1999年第2期73-77,共5页
Chinese Computed Medical Imaging
基金
浙江省卫生厅立项资助
