What type of study is this?

This is a Experimental Study study.

September 17, 2025

Radial PC-bSSFP 4D Flow MRI at 0.6T

Key Points

Simultaneous 3D flow quantification and cine imaging were achieved using a free-running radial method, enhancing efficiency.
Velocity quantification results were consistent with 2D phase-contrast GRE references, showing only minor underestimation.
The approach utilized a wobbling Archimedian spiral trajectory, maximizing coverage and minimizing scan time.
This technique effectively allows cine imaging and flow measurement during free-breathing in lower-field MRI systems, expanding its applicability.

Abstract

Motivation: Phase-contrast balanced steady-state free precession enables the simultaneous acquisition of structural cine images and flow quantification, reducing total scan time. Goal(s): Full coverage 3D PC-bSSFP for simultaneous cine and flow quantification using a free-running radial approach. Approach: A wobbling Archimedian spiral (WASP) 3D radial trajectory was implemented on a prototype 0.6T system, utilizing added bipolar velocity-encoding gradients and referenceless velocity quantification. Results: 3D PC-bSSFP velocity quantification compared well to 2D PC-GRE reference, showing a small velocity underestimation, and producing cine-contrast magnitude images which enabled retrospective reslicing to any cine view. Impact: Referenceless radial cine 3D phase-contrast balanced steady-state free precession (PC-bSSFP) enables simultaneous full coverage cine images and flow quantification during free-breathing. This method is particularly well suited for lower-field systems, taking advantage of relaxed sequence restrictions at lower field strengths.

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