Focus Session 5: MR Techniques and Methods: Rapid Image Acquisition and Reconstruction (2019)-5D Flow MRI – Respiratory-motion resolved quantification of flow and turbulent kinetic energy with compressed sensing and Bayesian multipoint velocity unfolding

5D Flow MRI – Respiratory-motion resolved quantification of flow and turbulent kinetic energy with compressed sensing and Bayesian multipoint velocity unfolding

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Video Transcription

Video Summary

The talk described a fixed-time 4D flow MRI method to measure aortic turbulence and flow more efficiently. By combining tiny golden angle sampling, self-gating, respiratory and cardiac motion binning, and locally low-rank reconstruction, the team used all respiratory data instead of discarding most of it. This reduced scan time from about 18 minutes to 4 minutes while preserving accurate peak velocity and flow measurements in nine volunteers. The method produced better image sharpness than using only expiration data and avoided motion artifacts seen when ignoring respiration. It also enabled accurate turbulence mapping and low-velocity quantification.

Keywords

4D flow MRI

aortic turbulence

golden angle sampling

respiratory motion binning

locally low-rank reconstruction