We developed a novel method, Variable TI, to improve the visibility of ASL based UTE 4D-MRA. In the phantom study and the volunteer study, the Variable TI UTE 4D-MRA offered a higher signal intensity and improved visualization of arteries in late phase compared to the conventional method. The Variable TI technique can improve clinical usability of 4D-MRA because this technique not only offered better visibility of arteries but also realized the data efficacy and reduced reconstruction time.
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