Velocity Profiles in Mitral Blood Flow Based on Three-dimensional Freehand Colour Flow Imaging Acquired at High Frame Rate

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Abstract

Aims: 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. Methods: 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. Results: 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). Conclusion: 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. © 2000 The European Society of Cardiology.

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Haugen, B. O., Berg, S., Brecke, K. M., Samstad, S. O., Slørdahl, S. A., Skjærpe, T., & Torp, H. (2000). Velocity Profiles in Mitral Blood Flow Based on Three-dimensional Freehand Colour Flow Imaging Acquired at High Frame Rate. European Journal of Echocardiography, 1(4), 252–256. https://doi.org/10.1053/euje.2000.0041

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