6层螺旋CT脑血管成像的应用体会

Applied experience of 6-slice spiral CT cerebral anaiography

目的探讨6层螺旋CT脑血管成像的扫描方案的最优化、多维成像方法的综合运用及其临床价值。方法30例临床疑诊脑血管疾病的患者，随机分成3组，分别选取1mm，2mm，3mm准直宽度扫描，对比增强的延迟时间主要采用估算法（15-20s），应用多种后处理技术行多维重建。结果图像质量与所用的准直宽度密切相关，采用1mm准直，重建出的图像质量为优，2mm准直为良，3mm准直较差。共发现动脉瘤12例，动静脉畸形2例，颈内动脉海绵窦瘘1例。VR，MIP发现动脉瘤的灵敏度最高，对病变的显示也更直观、清晰、可靠，SSD，MPR／CPR，VE在某方面具优势，是有益的补充。结论应用6层螺旋CT扫描机，通过选择合理的扫描参数，优化扫描方案，充分应用多种后处理手段，可以在一定程度上弥补机器性能的不足，获得较满意的脑血管CTA图像。

Objective To investigate the optimization of 6-silice spiral CT cerebral angiography protocol,comprehensive application of multidimensional imaging modalities and their clinical utilities.Methods Thirty patients with clinically suspected cerebrovacular diseases were randomly divided into three groups according to applied collimator width （1 mm,2 mm and 3 mm）.The delayed time of contrast enhancement was mainly adopted the estimative means （15-20 s）,while multidimensional reconstructions were performed by using varied postprocessing techniques.Results The imaging quality of the cerebral angiography was closely correlated with collimator width,for example,the imaging quality acquired from 1 mm was optimal,that from 2 mm was better,whereas that from 3 mm was more poor.Among all patients,the aneurysm,arteriovenous malformation and cavernous sinus fistula of internal carotid were found in 12,2 and 1 case,respectively.Volume rendering technique （VRT） and maximum intensity projection（MIP） were most sensitive for finding aneurysm and they could also directly and clearly visualize the lesions.Surface shaded display （SSD）,mutli-planar reconstruction（MPR）,curved plannar reconstruction （CPR） and CTVE were helpful complement because they had more or less advantages in some aspects.Conclusion Application of 6-slice spiral CT scanner through selecting the reasonable scanning parameters,optimize the scanning protocol and full using the postprocessing techniques can complement the defects of CT scanner self-property and therefore can obtain the satisfactory cerebrovascular CTA images.