右房密度监测触发CT肺动脉成像  

Computed tomography pulmonary angiography with right atrium bolus triggering

作　　者：朱艳艳[1] 侯代伦[1] 王胰[2] 王敏[3] 

机构地区：[1]山东省胸科医院影像科,山东济南250101 [2]四川省人民医院心血管超声及心功能科 [3]济宁市第一人民医院CT室

出　　处：《实用放射学杂志》2016年第4期591-594,共4页Journal of Practical Radiology

基　　金：山东省自然科学基金项目（ZR2013HM029）.

摘　　要：目的 通过对右房（RA）CT值的监测，寻找其达峰时间，优化CT肺动脉成像（CTPA）显像。方法 采集拟行CTPA的患者60例，随机分成2组，肺动脉触发（PT）组（n=30）：注射70 mL对比剂（CA）并屏气，采用肺动脉干CT值监测触发方式获取CTPA图像；RA组（n=30）：注射40 mLCA，自由呼吸，并采用RA监测触发方式。对图像质量、肺动脉及肺静脉CT值、肺动脉-肺静脉密度差值等进行对比。结果 RA组图像质量、肺动脉平均值及肺动脉-肺静脉密度差明显高于PT组（P〈0.05），而RA组肺静脉CT值更低P〈0.05）。肺动脉6级分支显示比例2组无统计学差异（P〉0.05）。结论 自由呼吸状态下基于RA密度监测触发的CTPA能在肺静脉CT值最低时使肺动脉得到最大强化，且CA使用量减少。Objective To optimize the CT pulmonary angiography （CTPA） using right atrium （RA） CT value monitoring to determine the accurate time to peak CT value of pulmonary artery. Methods Sixty patients were randomly divided into two groups and 30 patients for each. Group PT： CTPA acquisition was triggered by pulmonary trunk monitoring, holding breath and 70 mL contrast agent （CA）. Group RA： CTPA was performed using triggering from RA with spontaneous respiration and 40 mL CA. Imaging quality, average CT values of pulmonary arteries and veins, as well as their density difference were compared. Results The imaging quality, average CT values of pulmonary arteries and artery-veins density difference were significantly higher in group RA （P〈0.05）, while the CT values of pulmonary veins were significantly lower in group RA （P〈0.05）. No significant differences were showed in the proportion of subjects where sixth grade pulmonary arteries were opacified between the two groups （P〉0.05）. Conclusion CTPA imaging is optimized by triggering from RA CT value monitoring. This technique provides the optimal enhancement of pulmonary artery and minimal contrast filling of pulmonary venous with reduced doses of CA.

关 键 词：肺动脉 计算机体层成像 肺动脉成像 肺栓塞 

分 类 号：R814.42[医药卫生—影像医学与核医学] R814.43[医药卫生—放射医学]