Keywords: Vessels, Vessels, velocity; high-field MR
Motivation: Unenhanced MRA on feet has always been challenging due to slow blood flow. The ultra-high field strength MR systems have been proved to offer improved visualization of distal small vessels.
Goal(s): We aim to assess the visualization of foot vessels using three-dimensional phase contrast MRA (3D-PC-MRA) at 5T field-strength.
Approach: Participants were prospectively recruited and underwent 5T 3D-PC-MRA on feet with and without warm water immersion.
Results: Immersion of feet in warm water significantly improves visualization of distal small branches, and increases the average velocity of blood flow by 40%, resulting in the visualized enhancement in blood signal.
Impact: 5T 3D phase-contrast MRA is effective in visualizing lower-extremity vasculatures and small branches, and its visualization can be significantly improved by immersing feet in warm water.
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