【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。更多还原

【Abstract】 Objective To quantitatively analyze MSCT morphological changes of pulmonary artery tree with fractal dimension(FD).Methods Totally 31patients 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.更多还原