正常成人肺动脉分支心动周期不同时相影像对比研究

目的建立正常成人多排螺旋CT(MDCT)心动周期不同时相肺动脉分支几何学数据库。方法选择正常成人胸部心电门控MDCT增强扫描,分别进行代表心动周期不同时相的心电间期的滑动薄层块最大密度投影(STS M IP)重建,并测量主肺动脉至叶段级分支的直径及长度;采用Dopp ler超声心动图心电门控测量主肺动脉瓣上及左右肺动脉近端内径作为对比。结果MDCT显示主肺动脉瓣上直径收缩期较舒张期增大,双肺动脉近端、右肺动脉远端、右中叶动脉、右下后基底段及左下内基底段动脉直径舒张期较收缩期增大,右上叶后段长度舒张期较收缩期增大,其余肺动脉分支数值未出现显著性差异。主肺动脉/右肺动脉跨度舒张期较收缩期增大。超声心动图除主肺动脉瓣上直径双期变化与MDCT相一致外,左右肺动脉近端内径双期无显著性差异。结论将MDCT胸部增强扫描得到主肺动脉至肺叶段动脉分心动周期不同时相进行测量对建立肺动脉流态模型是有必要的。

Comparative Study on Imaging of Pulmonary Artery Branches in Different Phase of Cardiac Cycle in Healthy Adult

Objective To establish the database of diameter and length of the pulmonary artery branches in different phase of cardiac cycle in healthy adult chest MDCT.Methods Normal enhanced chest MDCT with ECG-gating was selected and slab thin slice maximaun intensity projection(STS MIP) reconstruction were performed in different periods on ECG represent systole and diastole respectively.The diameter and length of pulmonary artery on the plane which showed the whole length of the aim artery were measured.Doppler UCG with ECG-gating was performed in healthy adults to measure the inner diameter of pulmonary trunk and right and left pulmonary artery in different phases of the cardiac cycle as contrast method.Results Normal enhanced chest MDCT with ECG-gating showed the diameter in systole period of the main pulmonary artery was larger than that in diastole period,while it went conversely to that of the proximal part of two pulmonary arteries,distal part of the right pulmonary artery,right media-lobe artery,both S10 segmental arteries and the difference were statistic significantly,only the length in diastole period of the right upper lobe artery was larger than that in systole period.The distance between the measured point of the main artery and the right one showed larger in diastole than systole period.On ECG-gating UCG,in addition to that the diameter change of the main pulmonary artery during the two periods were coincident with MDCT,the two pulmonary artery had no significant difference during the two periods.Conclusion It is necessary using branching geometry data of the main artery to segmental arteries in different period of the cardiac cycle with normal enhanced chest MDCT for flowing model building of pulmonary artery.