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    請使用永久網址來引用或連結此文件: https://nccur.lib.nccu.edu.tw/handle/140.119/65804


    題名: Quantification of non-water suppressed MR spectra with correction for motion induced signal reduction
    作者: 蔡尚岳
    Tsai, Shang-Yueh
    貢獻者: 應物所
    關鍵詞: non–water suppressed MRS;in vivo single voxel spectroscopy;motion correction;spectral processing;signal restoration
    日期: 2009.12
    上傳時間: 2014-05-01 17:47:55 (UTC+8)
    摘要: Intrascan subject movement in clinical MR spectroscopic examinations may result in inconsistent water suppression that distorts the metabolite signals, frame-to-frame variations in spectral phase and frequency, and consequent reductions in the signal-to-noise ratio due to destructive averaging. Frame-to-frame phase/frequency corrections, although reported to be successful in achieving constructive averaging, rely on consistent water suppression, which may be difficult in the presence of intrascan motion. In this study, motion correction using non–water-suppressed data acquisition is proposed to overcome the above difficulties. The time-domain matrix-pencil postprocessing method was used to extract water signals from the non–water-suppressed spectroscopic data, followed by phase and frequency corrections of the metabolite signals based on information obtained from the water signals. From in vivo experiments on seven healthy subjects at 3.0 T, quantification of metabolites using the unsuppressed water signal as a reference showed improved correlation with water-suppressed data acquired in the absence of motion (R2 = 0.9669; slope = 0.94). The metabolite concentrations derived using the proposed approach were in good agreement with literature values. Computer simulations under various degrees of frequency and phase variations further demonstrated robust performance of the time-domain postprocessing approach. Magn Reson Med, 2009. © 2009 Wiley-Liss, Inc.
    關聯: Magn Reson Med, 62(6), 1394-1403
    資料類型: article
    顯示於類別:[應用物理研究所 ] 期刊論文

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