应用分形维数定量分析MSCT肺动脉树形态学改变  

Fractal dimension analysis for quantifying MSCT morphological changes of pulmonary artery tree

作　　者：孙海涛[1] 谢元忠[1] 朱小飞[1] 柳澄[2,3] 王昭华[1] 马振波[1] 

机构地区：[1]泰安市中心医院CT室,山东泰安271000 [2]山东省医学影像学研究所,山东济南250021 [3]山东省立医院CT室,山东济南250021

出　　处：《中国医学影像技术》2013年第8期1375-1378,共4页Chinese Journal of Medical Imaging Technology

摘　　要：目的应用分形维数(FD)定量分析多层螺旋CT肺动脉树的形态学改变。方法对31例患者进行增强螺旋CT扫描和经胸超声心动图检查,根据病变分为肺动脉高压组(PH组,14例)和无肺动脉高压组(无PH组,17例)。应用后处理软件形成肺动脉树,以Image J软件计算肺动脉树的投影面积及分形维数(FD);比较两组FD、肺动脉树投影面积和肺动脉压力(PAP),分析三者的相互关系。结果 PH组FD、图像投影面积和PAP均显著高于无PH组。肺动脉树的FD值与PAP、FD与图像投影面积,PAP与图像投影面积均存在正相关(r=0.82,P<0.05;r=0.49,P<0.05;r=0.65,P<0.05)。结论 FD能定量评价整个肺动脉的形态学改变,或可作为定量描述整个肺动脉形态学的重要指标之一。Objective To quantitatively analyze MSCT morphological changes of pulmonary artery tree with fractal dimension （FD）. Methods Totally 31 patients underwent enhanced thoracic CT and transthoracic echocardiography, respectively, and then were divided into pulmonary hypertension （PH） group （PH group, n=14 ） and non-PH group （n=17）. Pulmonary artery trees were generated using post-processing software, FD and projected image area of pulmonary artery trees were determined with Image J software. FD, projected image area and pulmonary artery pressure （PAP） of the two groups were compared, and the relationships among FD, projected image area and PAP were analyzed. Results FD, projected image area and PAP in PH group were higher than those in non-PH group （all P〈0.05）. There was positive correlation between FD and PAP （r=0.82, P〈0.05）, FD and projected image area （r=0.49, P〈0.05） as well as PAP and projected image area （r=0.65, P〈0.05）. Conclusion FD can quantitatively evaluate morphologic changes of pulmonary artery, which may become one of the important indexes of quantitative description of pulmonary artery morphology.

关 键 词：体层摄影术 X线计算机 高血压 肺性 分形维数 

分 类 号：R544.1[医药卫生—心血管疾病] R814.42[医药卫生—内科学]