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Abstract #1645

Evaluation of optimized 4D ultrashort TE MR Angiography using Variable Inversion Time

Haruyuki Fukuchi1,2,3, Toshiya Akatsu4, Kei Fukuzawa3, Nao Takano4, Yutaka Ikenouchi2, Michimasa Suzuki2, Kohji Kamagata2, Akihiko Wada2, Osamu Abe1, and Shigeki Aoki2
1Radiology, Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan, 2Department of Radiology, Juntendo University Graduate School of Medicine, Tokyo, Japan, 3Department of Radiology, Toranomon Hospital, Tokyo, Japan, 4Department of Radiology, Juntendo University Hospital, Tokyo, Japan

We developed and refined a novel method, Variable TI, to improve the visibility of ASL based UTE 4D-MRA. From numerical simulations and the flow phantom studies we found the signal tendency and blood signal skipping phenomena. With refined parameters we got 50% of signal enhancement comparing to conventional method. We conduct volunteer study with the refined Variable TI UTE 4D-MRA and this novel method 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.

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