摘要
目的探讨双能量头颅CTA检查中对比剂的剂量和注射流率及采用手动触发方法确定延迟时间的设定.方法疑颅内血管病变的240例患者行双能量头颅CTA检查,按对比剂流率和总量分为4组:4.0/60、4.5/60、4.0/70、4.5/70(mL/s/mL),每组60人;据触发时左颈总动脉平均CT值分为100～150 HU、150～200HU、200～250 HU 3组,每组80人,参照文献将血管图像质量分为4级比较.结果 4.0/60、4.5/60、4.0/70、4.5/70(/mL/s/mL)4组所得到的血管图像质量比较,差异无统计学意义(P>0.05),图像质量Ⅰ级者也没有统计学差异,各组中血管图像质量Ⅰ、Ⅱ级者明显多于其它等级.触发时左颈总动脉内不同平均CT值所得血管图像质量比较,差异有统计学意义(P<0.05),100～200 HU组比200～250 HU血管图像质量好.结论双能量头颅CTA对比剂选择以4.0～4.5mL/s的流率和60～70 mL的总量,应用造影剂跟踪技术,感兴趣区设在第4颈椎下缘平面,手动触发,能够得到优质的血管图像.
Objective To investigate contrast agent volume, injection flow rate and manually setting trigger delay time in head CTA with dual-energy dual-source CT. Methods 240 patients suspected of intracranial vascular diseases underwent dual-energy head CTA, and were divided into four groups of 4.0/60, 4.5/60, 4.0/70, 4.5/70 （mL/s/mL） according to contrast agent flow rate and the total volume. Moreover, the patients were divided into three groups of 100-150 HU, 150-200 HU, 200-250 HU according to the average CT value of the left common carotid artery. The image quality was analyzed according to the literature. Results The difference of vascular image quality was not statistically significant among the four groups of 4.0/60, 4.5/60, 4.0/70, 4.5/70 （P〉0.05） The difference in the image quality of grade I was also not statistically significant, and the image qualities of grade I , 11 were significantly more than other grades. The image quality of different mean CT values of the left common carotid artery had a statistically significant difference （P 〈0.05） , which 100-200 HU group was better than 200-250HU group. Conclusion The excellent image quality could be obtained with the flow rate of 4.0-4.5 mL/s and the total volume of 60-70mL contrast agent, by bolus tracking and setting region of interest in the lower edge of the fourth cervical plane in head dual energy CTA with Dual Source CT.
出处
《昆明医科大学学报》
CAS
2013年第2期99-105,共7页
Journal of Kunming Medical University
基金
昆明医科大学研究生创新基金资助项目(KM2007L33)
关键词
双源CT
双能量
脑血管造影
Dual-source CT
Dual-energy
Cerebral angiography
