Abstract #1645

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

Haruyuki Fukuchi^1,2,3, 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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