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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