摘要
目的 通过比较 3种不同对比剂注射流率对多层螺旋CT颈动脉成像的影响以期获得合理扫描参数。资料与方法 随机选择无脑缺血症状和脑梗死患者及有症状者共 45例 ,随机分成 3ml/s、4ml/s、5ml/s 3组 ,对比剂用量根据扫描时间作相应的改变 ,其他扫描参数不变。采用最大密度和容积重建 2种后处理成像方法。根据 90条颈动脉血管边缘的清晰度、颈动脉的分级情况、颈动脉与其邻近软组织之间的密度差、颈静脉和甲状腺的密度综合评分 ,由 2位有经验的放射科医师用盲法评分 ,对比 3种不同注射流率对成像的影响 ,所有统计工作由SPSS软件完成。结果 与 3ml/s组相比 ,4ml/s组颈动脉强化峰值升高明显 ,使得颈动脉与邻近软组织间密度差异增大 ,3D图像信噪比提高 ,小血管显示的长度、血管边缘清晰度均有明显改善。 5ml/s与 4ml/s组之间的差异不明显。此外 ,5ml/s注射流率可带来扫描伪影。结论 随着注射流率的加快 ,颈动脉与邻近软组织密度差异变得愈明显 ,但注射流率超过
Objective To determine the optimal scanning parameters of multiple detector row spiral CT angiography (MDSCTA) for carotid artery by comparing the quality of the images obtained with three different injection rate of the contrast.Materials and Methods Forty five patients with or without clinical signs of cerebral ischemia or infarction were randomly selected and divided into three groups. During MDSCTA, the injection rate of 3ml/s, 4ml/s or 5ml/s was used for three groups, respectively. Maximum intensity projection (MIP) and volume rendering (VR) were used for image reconstruction. Based on the marginal sharpness and branches of the vessels, the density difference between the vessels and the adjacent tissues, and the density of the jugular veins and thyroid, a general evaluation of the image quality of the 90 carotid arteries was conducted by two experienced radiologists with blind method. A comparison of the image quality between three groups was made. Statistic analysis was carried out with the software of SPSS.Results For MIP, the image quality of 4ml/s group was superior to that of 3ml/s group, while no obvious difference existed between 4ml/s group and 5ml/s group. For VR, the difference in image quality between three groups was not significant.Conclusion For MDSCTA of carotid artery, the injection rate of 4ml/s is preferable. The injection rate over 4ml/s to further improve the image quality is of no clinical significance.
出处
《临床放射学杂志》
CSCD
北大核心
2002年第12期939-943,共5页
Journal of Clinical Radiology
基金
教育部博士点基金资助项目 (基金号 :974 1)
关键词
颈动脉
多层螺旋CT
注射流率
CT血管成像
Carotid artery Multiple detector row spiral CT Injection rate CT angiography
