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    Magn Reson Med. 2009 Jul;62(1):193-204.

    Multiple repetition time balanced steady-state free precession imaging.

    Cukur T, Nishimura DG.

    Department of Electrical Engineering, Stanford University, Stanford, CA 94305-9510, USA. cukur@stanford.edu

    Although balanced steady-state free precession (bSSFP) imaging yields high signal-to-noise ratio (SNR) efficiency, the bright lipid signal is often undesirable. The bSSFP spectrum can be shaped to suppress the fat signal with scan-efficient alternating repetition time (ATR) bSSFP. However, the level of suppression is limited, and the pass-band is narrow due to its nonuniform shape. A multiple repetition time (TR) bSSFP scheme is proposed that creates a broad stop-band with a scan efficiency comparable with ATR-SSFP. Furthermore, the pass-band signal uniformity is improved, resulting in fewer shading/banding artifacts. When data acquisition occurs in more than a single TR within the multiple-TR period, the echoes can be combined to significantly improve the level of suppression. The signal characteristics of the proposed technique were compared with bSSFP and ATR-SSFP. The multiple-TR method generates identical contrast to bSSFP, and achieves up to an order of magnitude higher stop-band suppression than ATR-SSFP. In vivo studies at 1.5 T and 3 T demonstrate the superior fat-suppression performance of multiple-TR bSSFP. (c) 2009 Wiley-Liss, Inc.

    PMID: 19449384 [PubMed - indexed for MEDLINE]

    PMCID: 2768767

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