Valves and Flow Positioning and Technique (Tech)-MRI assessment of valve structure and function

MRI assessment of valve structure and function - technical methods

Video Transcription

Video Summary

The speaker explains how MRI measures blood flow using phase-contrast imaging. Spin phase shifts caused by motion are converted into velocity, and flow is calculated from vessel area and velocity over the cardiac cycle. Key topics include choosing the right VENC to avoid aliasing, correcting background phase errors, shimming, and placing vessels in isocenter. Accurate volume flow requires slow, non-segmented sequences, while breath-hold scans are acceptable for peak velocity. The talk also emphasizes scanner-specific validation using healthy volunteers and comparing aortic and pulmonary flows for consistency.

Keywords

MRI blood flow

phase-contrast imaging

VENC aliasing

volume flow measurement

background phase correction