Test Bolus法与Bolus Tracking法在头颈CTA中的对比研究

Comparative Study of Test Bolus Method and Bolus Tracking Method in Head and Neck CTA

目的通过Test Bolus法与Bolus Tracking法在头颈CTA扫描技术的图像质量对比,探讨头颈CTA扫描的最佳扫描技术。方法选取头颈CTA检查Test Bolus法和Bolus Tracking法的患者各30例,将扫描数据进行图像后处理,主观评价采用五分法,客观评价分别在主动脉弓、颈总动脉和大脑中动脉M1段血管内测量CT值,分析两种扫描方法的主观评价和客观评价差异性比较。结果主观评价图像质量Test Bolus法优于Bolus Tracking法,差异具有统计学意义(P﹤0.05)。客观评价血管内CT值Test Bolus法均高于Bolus Tracking法,主动脉弓血管内CT值差异无统计学意义(P﹥0.05);颈总动脉和大脑中动脉M1段管内CT值差异具有统计学意义(P﹤0.05)。结论在头颈CTA扫描技术中,Test Bolus法扫描可准确计算CTA的扫描启动时间,可以获取最佳扫描时机。

Objective By comparing the image quality of Test Bolus method and Bolus Tracking method in head and neck CTA scanning technology,the best scanning technology for head and neck CTA scanning is discussed.Methods 30 patients with head and neck CTA,30 patients with low-dose test bolus method and 30 patients with contrast agent bolus tracking method were selected.The scanned data were processed by image post-processing.The five point method was used for subjective evaluation.The CT values were measured in the M1 segment of aortic arch,common carotid artery and middle cerebral artery respectively.The differences between the subjective evaluation and objective evaluation of the two scanning methods were analyzed.Results Subjective evaluation of image quality test bolus method was better than bolus tracking method,and the difference was statistically significant(P﹤0.05).Objective evaluation of intravascular CT values test bolus method was higher than bolus tracking method,and there was no significant difference in intravascular CT values of aortic arch(P﹥0.05);There was significant difference in CT values between common carotid artery and M1 segment of middle cerebral artery(P﹤0.05).Conclusion In the head and neck CTA scanning technology,Test Bolus method can accurately calculate the start time of CTA scanning and obtain the best scanning time.