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Abstract #3762

Nonenhanced Time-Resolved MR Angiography for the Arteriovenous Malformation/Fistula of the Pelvis and the Lower Extremity.

Masaaki Akahane1, Jiro Sato1, Shuhei Komatsu1, Yasushi Watanabe2, Yoshiro Satake2, Kuni Ohtomo1

1Radiology, University of Tokyo, Bunkyo-ku, Tokyo, Japan; 2Clinical Radiology, University of Tokyo, Bunkyo-ku, Tokyo, Japan

Nonenhanced MRA by spin-labeling technique with subtraction between labeled and non-labeled images was applied to the time-resolved study for better background suppression in any inversion time. Seven patients having arteriovenous malformations or fistulas of the pelvis or lower extremity underwent nonenhanced time-resolved MRA using respiratory-gated balanced steady state free precession (SSFP) sequence with 1.5-T scanner (Toshiba EXCELART Vantage, Japan). Inversion times (TI) were assigned as 300, 800, 1300 and 1800 ms. Nonenhanced time-resolved MRA was useful for the evaluation of hemodynamics of the arteriovenous malformation or fistula and the distinction of feeding arteries.