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Abstract #2663

Optimization of a new accelerated time-of-flight Brain MR angiography using spiral data acquisition: Spiral MRA

Yutaka Hamatani1, Kayoko Abe2, Yasuhiro Goto1, Masami Yoneyama3, Isao Shiina1, Kazuo Kodaira1, Yoshihiro Ikeda1, Mamoru Takeyama1, Isao Tanaka1, and Shuji Sakai2

1Department of Radiological Services, Tokyo Women's Medical University Hospital, Tokyo, Japan, 2Department of Diagnostic Imaging and Nuclear Medicine, Tokyo Women's Medical University, Tokyo, Japan, 3Philips Electronics Japan, Tokyo, Japan

Spiral MRA is a new accelerated time-of-flight MR angiography (TOF MRA) with spiral data acquisition, which acquires MR data by traveling through k-space with spirals. Acquisition window (AW) is a new parameter, which indicates the degree of under-sampling related to image quality and acquisition time. In this study, suitable flip angle (FA) and AW for Spiral MRA was evaluated by a 5-point scale and signal profile analysis. In conclusion, the suitable FA was 25° to demonstrate each artery and suppress the background signals. AW should be set to 10 or less to avoid vessel blurring.

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