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目的:探讨合理的脑血管电子束CT(EBCT)的检查模式。材料与方法:选择72例EBCTA检查结果正常者随机分组、对照,进行前瞻性研究,采用ImatronC150EBCT扫描仪,连续容积(CVS)和步进式(SVS)两种扫描模式,3~5ml/s注射速度,重建方法选择最大信号强度投影(MIP)和表面遮盖法(SSD)。结果:(1)同一剂量下,CVS扫描组的不同脑血管部位CT值要高于相同条件下的SVS扫描组(P<0.01);同一扫描模式组内,5ml/s组的不同脑血管部位CT值高于3ml/s组(P<0.01);3ml/sCVS扫描组的不同脑血管部位CT值与5ml/sSVS组无明显差异(P>0.05);(2)各组对于各级脑血管的主干及1~3级分支显示率为100%,对于大脑中动脉4~5级分支5ml/sCVS组显示率仍高达94.4%,前、后交通动脉的显示率存在较大差异。结论:注射速度5ml/s,延迟时间由小剂量试验而定(一般为12~16s),层厚3mm,间隔1.5mm,CVS重叠扫描模式是较为理想的电子束CT检查模式。
Objective: To explore a reasonable examination mode of cerebrovascular electron beam computed tomography (EBCT). MATERIALS AND METHODS: Seventy-two patients with normal EBCTA were randomly divided into control group and control group. The prospective study was conducted. ImacanC-150EBCT scanner, continuous volume (CVS) and step-by-step (SVS) s injection speed, reconstruction method to choose the maximum signal intensity projection (MIP) and surface covering method (SSD). Results: (1) Under the same dose, CT value of different cerebrovascular parts in CVS scan group was higher than that of SVS scan group under the same condition (P <0.01); in the same scan mode group, The CT value of the vascular site was higher than that of the 3ml / s group (P <0.01). There was no significant difference in the CT value between the 3ml / sCVS scan group and the 5ml / sSVS group (P> 0.05) For all levels of cerebrovascular trunk and grade 1 to 3 branches showed a rate of 100%, 4 to 5 branches of the middle cerebral artery 5ml / sCVS group showed a high rate of 94.4%, the anterior and posterior communicating artery display rate There is a big difference. Conclusion: The injection speed of 5ml / s, the delay time is determined by the low-dose test (usually 12 ~ 16s), the thickness of 3mm, the interval of 1.5mm, CVS overlapped scanning mode is the ideal electron beam CT examination mode.