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Abstract #4242

Residual Blood Signal Elimination on T1W Non-Gated Radial Scan for MR Carotid Plaque Imaging

Takashi Nishihara1, Hikaru Hanada1, Kuniharu Oka1, Masahiro Takizawa1, Chikako Moriwake2, Hiroyuki Itagaki1, Tetsuhiko Takahashi1, Yosuke Hirata3, Makoto Sasaki4

1MRI System Division, Hitachi Medical Corporation, Kashiwa, Chiba, Japan; 2Marketing Division, Hitachi Medical Corporation, Tokyo, Japan; 3Center for Radiological Sciences, Iwate Medical University Hospital, Morioka, Iwate, Japan; 4Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Morioka, Iwate, Japan

Non-gated T1W plaque imaging has been proposed for evaluating plaque characteristics. To improve image quality, we introduced flow dephasing pulses to eliminate residual blood signal and evaluated it. We determined the b value of flow dephasing pulses which can eliminate flow signal, and the ratio P of the asymmetric sampling that doesnft affect spatial resolution. We applied the determined P value of 8% and b value of 0.4s/mm2 to volunteer imaging. The residual flow signal in ICA was eliminated and image resolution was not affected. We achieved a good contrast for plaque imaging by using non-gated radial sampling SE sequence.