multi-reception strategy with improved snr for multichannel mr imagingmulti-reception策略对多通道成像先生提高了信噪比.pdfVIP

Multi-Reception Strategy with Improved SNR for Multichannel MR Imaging 1 1 1 1,2,3 1,2,3 Bing Wu , Ye Li , Chunsheng Wang , Daniel B. Vigneron , Xiaoliang Zhang * 1 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America, 2 University of California San Francisco/University of California Berkeley Joint Graduate Group in Bioengineering, University of California, Berkeley/San Francisco, California, United States of America, 3 California Institute for Quantitative Biosciences, San Francisco, California, United States of America Abstract A multi-reception strategy with extended GRAPPA is proposed in this work to improve MR imaging performance at ultra- high field MR systems with limited receiver channels. In this method, coil elements are separated to two or more groups under appropriate grouping criteria. Those groups are enabled in sequence for imaging first, and then parallel acquisition is performed to compensate for the redundant scan time caused by the multiple receptions. To efficiently reconstruct the data acquired from elements of each group, a specific extended GRAPPA was developed. This approach was evaluated by using a 16-element head array on a 7 Tesla whole-body MRI scanner with 8 receive channels. The in-vivo experiments demonstrate that with the same scan time, the 16-element array with twice receptions and acceleration rate of 2 can achieve significant SNR gain in the periphery area of the brain and keep nearly the same SNR in the center area over an eight-element array, which indicates the proposed multi-reception strategy and extended GRAPPA are feasible to improve image quality for MRI systems with limited receive