【摘要】 目的探讨小剂量对比剂团注测试（test bolus）的扫描方案在宝石CT头颈部动脉成像中的应用价值。方法将100例行头颈部CTA检查者分为A、B两组,各50例。A组:用20mL对比剂及20mL生理盐水团注测试。B组:用4mL对比剂及20mL生理盐水团注测试。两组测试完后均用50 mL对比剂及50 mL生理盐水行增强扫描。利用微钙化点感兴趣区域（MROI）分析软件观察并测量test期C₄段颈总动脉、平扫期C₄段颈总动脉及大脑中动脉CT值,采用双盲法,由两名有经验的放射科CT技师分别独立进行评价分析。结果两名技师对两组test期C₄段颈总动脉强化情况的评分结果的差异均无统计学意义（U=208、236,P>0.05）。两名技师对两组test期C₄段颈总动脉、平扫期C₄段颈总动脉及大脑中动脉CT值测量结果中,两组间差异均无统计学意义（t=0.276、0.243,P>0.05）。结论宝石CT行头颈CTA检查时,应用4mL对比剂及20mL生理盐水团注测试,同样能获得良好的图像质量,能满足C₄段颈总动脉达峰时间的准确测量,还降低了总对比剂的用量。更多还原

【Abstract】 Objective To discuss the application value of small dose injection of contrast agent test bolus scan program in cerebral and carotid gemstone CT angiography.Methods One hundred patients undergoing cerebral and carotid CTA examination were randomly divided into the group A and B,50 cases in each group.The group A conducted the test bolus with 20 mL contrast agent and 20 mL normal saline.The group B conducted the test bolus with 4mL contrast agent and 20 mL normal saline.After that,the enhanced scan was performed with 50 mL contrast agent and 20 mL normal saline in the two groups.The MROI analysis software was used to observe and measure the CT values of the common carotid artery of C₄ segment in the test period,and the common carotid artery of C₄ segment and the cerebral middle artery in plain scan period,with double-blind method,the data were respectively evaluated and analyzed by two experienced radiology CT technologists.Results The image quality scores on the common carotid artery of C₄ segment in test period by two technologists had no statistically significant differences between the two groups（U=208,P>0.05;U=236,P>0.05）.The CT values of the common carotid artery of C₄ segment in the test period,common carotid artery of C₄ segment and the cerebral middle artery in plain scan period by the two technologists had no statistically significant differences between the two groups（t=0.276,P>0.05）.Conclusion In conducting the cerebral and carotid CTA with gemstone CT,using4 mL contrast agent and 20 mL normal saline for conducting the test bolus equally obtains the better imaging quality,can meet the accurate measurement of the common carotid artery reaching peak times at C₄ segment,moreover reduces amount of total contrast agent.更多还原