MSCT肺动脉成像不同参数对周围肺动脉显示率的对比研究

目的：采用MSCT不同注射速率、对比剂浓度及准直评价周围肺动脉的显示。方法：收集我院2011年2—10月行胸部增强扫描并符合纳入标准的病例100例，分别按照对比剂浓度及注射速率分为A、B、C、D四组；不同准直即0.6 mm，1.5 mm分为D、E两组；统计学分析肺动脉干、左右肺动脉及4级肺动脉CT值和5、6肺动脉显示率；结果：5组肺动脉干、左右肺动脉及4级肺动脉CT值比较有差异（P<0.05）；4级肺动脉分支显示数目无统计学意义（P=0.19）；5级肺动脉显示率下叶区有统计学差异（P<0.05）；6级肺动脉显示率每个叶区均有统计学差异（P<0.05）；D组与E组比较5级肺动脉显示率无统计学意义（P=0.48），6级肺动脉显示率有差异（P=0.00）。结论：采用0.6 mm准直，浓度350 mgI/mL，注射速率5 mL/s可以显著提高周围肺血管显示率。

Compare visualization of the peripheral pulmonary arteries of different parameters with MSCT angiography of the pulmonary arteries

Objective： To assess visualization of the peripheral pulmonary arteries under different concentration of contrast medium, flow injected rate of iodine and different collimation with MSCT. Methods： One hundred patients who met the inclusion criteria were detected by thoracic enhanced CT scan from February to October 2011 in our hospital. These people were divided into 4 groups （Groups A, B, C, D） according to different concentration contrast medimn, flow injected rate of iodine and 2 groups of different collimation （Group D 0.6 mm, Group E 1.5 mm）. And statistical analysis of the CT values of pulmonary trunk, left and right pulmonary arteris and the fourth- order arteries. The visualization of the fifth- and sixth- order arteries were measured. Results： The differences of CT values of pulmonary trunk, left and right pulmonary arteries and the fourth- order arteries were statistical significance （P〈0.05） and there was no statistically significant in the total number of the fourth- order arteries （P=0.19） in the five groups. There were statistical significance in the visualization of fifth- order arteries in lower lobe and sixth- order arteries in each lobe. There was no statistical significance in the visualization of fifth- order arteries（P=-0.48） and the opposite conclusion in sixth- order arteries（P=0.00） in group D and group E. Conclusion： Using 0.6 mm collimation, 350 mgI/mL concentration contrast medium and 5 mL/s flow injected rate of iodine in MSCT angiography of the pulmonary arteries can significantly increase visualization of the peripheral pulmonary arteries.