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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。
Objective To investigate the value of flow vector imaging (VFM) in assessing left atrium hemodynamics in normal subjects. Methods Sixty healthy volunteers were enrolled in this study. VFM was used to analyze the distribution and nature of the eddy currents in the left atrium at different phases. The maximum transverse diameter (Dx), maximum longitudinal diameter (Vmax), maximum longitudinal velocity (Vmax1) Vmax2, Nr, Nc and eddy current duration (Dt). Results The left atrial vortex was mainly distributed in the end of systole and diastole. The results showed that Dx was (34.8 ± 8.6) mm, Dy was (17.6 ± 7.0) mm, Vmax1 was (18.8 ± 10.4) cm / s, Vmax2 was (14.9 ± 7.6) cm / ± 4.0), Nc was (1.3 ± 0.5) and Dt was (0.1 ± 0.1) s respectively; mid-diastolic Dx was (26.4 ± 6.9) mm, Dy was (16.2 ± 8.4) mm, Vmax1 was (16.3 ± 8.0) ) cm / s, Vmax2 was (12.0 ± 7.6) cm / s, Nr was (4.5 ± 2.0) Nc was (1.1 ± 0.3) Dt was (0.1 ± 0.1) s. Conclusion VFM technique can be used as an effective method for hemodynamic assessment of left atrium.