【摘要】 目的探讨血流向量成像(VFM)技术在评估正常人左心房血流动力学中的价值。方法选取健康志愿者60例,应用VFM技术分析不同时相左心房内涡流分布情况及性质,测量涡流的最大横径(Dx)、最大纵径(Dy)、最大前向速度(Vmax1)、最大后向速度(Vmax2)、涡流圈数(Nr)、涡流中心数目(Nc)及涡流持续时间(Dt)。结果左心房内的涡流主要分布在收缩末期和舒张中期。测量结果:收缩末期的Dx为(34.8±8.6)mm,Dy为(17.6±7.0)mm,Vmax1为(18.8±10.4)cm/s,Vmax2为(14.9±7.6)cm/s,Nr为(6.4±4.0)个,Nc为(1.3±0.5)个,Dt为(0.1±0.1)s;舒张中期的Dx为(26.4±6.9)mm,Dy为(16.2±8.4)mm,Vmax1为(16.3±8.0)cm/s,Vmax2为(12.0±7.6)cm/s,Nr为(4.5±2.0)个,Nc为(1.1±0.3)个,Dt为(0.1±0.1)s。结论 VFM技术可作为左心房血流动力学评估的有效方法。更多还原

【Abstract】 Objective To investigate the value of left atrium hemodynamics in normal subjects by vector flow mapping(VFM)technique.Methods VFM technique was used to analyze the left atrial eddy current distribution and eddy current properties of 60 healthy subjects.The eddy current maximum transverse diameter(Dx),maximum longitudinal diameter(Dy),maximum forward velocity(Vmax1),maximum back velocity(Vmax2),number of eddy current(Nr),number of vortex centers(Nc),vortex duration(Dt)were measured.Results The eddy current in the left atrium distributed mainly in the end-systolic and mid-diastolic.The end-systolic values measured were(34.8±8.6)mm for Dx,(17.6±7.0)mm for Dy,(18.8±10.4)cm/s for Vmax1,(14.9±7.6)cm/s for Vmax2,(6.4±4.0)times for Nr,(1.3±0.5)times for Nc,(0.1±0.1)s for Dt.The mid-diastolic values measured were(26.4±6.9)mm for Dx,(16.2±8.4)mm for Dy,(16.3±8.0)cm/s for Vmax1,(12.0±7.6)cm/s for Vmax2,(4.5±2.0)times for Nr,(1.1±0.3)times for Nc,(0.1±0.1)s for Dt.Conclusion VFM technique can be taken as a useful method for the hemodynamic evaluation of the left atrium.更多还原