Velocity profiles in mitral blood flow based on three-dimensional freehand colour flow imaging acquired at high frame rate

European Journal of Echocardiography : the Journal of the Working Group on Echocardiography of the European Society of Cardiology
B O HaugenH Torp

Abstract

To describe the mitral blood flow velocity distribution, we applied a freehand dynamic three-dimensional (3D) colour flow method using a moving sample surface that followed the mitral apparatus during diastole. Nineteen healthy volunteers were studied. The ultrasound data were captured from 10-20 heartbeats at high frame rate (mean 46 frames/s) while freely tilting the transducer in an apical position. A magnetic position sensor system recorded the spatial position and orientation of the probe. Blood flow velocities were integrated across a spherical surface. In volumetric blood flow measurements this would yield angle independence of the Doppler beam. Raw digital data were analysed off-line with no loss of temporal resolution. The ratio of the maximum velocity time integral (VTI) to the mean VTI was mean 1.3 (range 1.1-1.6). At the time of peak flow the ratio of the maximum to the mean velocity was mean 1.5 (range 1.2-2.6). The blood flow velocity profile was non-uniform. By using a single sample volume in Doppler measurements of the maximum VTI errors ranging from 10 to 60% may be introduced in calculations of stroke volumes.

Citations

Jan 8, 2005·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Shuping GeMilan Sonka
Jan 11, 2020·American Journal of Physiology. Heart and Circulatory Physiology·Wenbin MaoWei Sun
Jul 26, 2005·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·James PembertonDavid J Sahn

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