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    • 9. 发明公开
    • Method for determining phase-corrected amplitudes in NMR relaxometric imaging
    • Verfahren zur Bestimmung phasenkorrigierter放大测量仪中的Amplitudeen NMR-Bildgebung
    • EP1972957A1
    • 2008-09-24
    • EP07290353.7
    • 2007-03-23
    • Institut CurieINSERM (Institut National de la Santé et de la Recherche Medicale)
    • Mispelter, JoëlLupu, Michaela
    • G01R33/50
    • G01R33/50
    • Accurate determinations of the NMR spin-spin relaxation parameters provided by multiple echoes imaging experiments (MSME) require first of all phase corrected amplitudes to deal with. The invention relates to a simple and robust algorithm for the phase correction procedure, to be applied following FFT reconstruction and prior to any fitting decay method. The algorithm is a pixel-by-pixel algorithm comprising the steps of determining a linear fit from complex amplitude values, defining a rotation angle with respect to the real axis, optimizing the angle, and applying a rotation to the amplitudes of the considered pixel through all echo images. The algorithm provides phase corrected amplitudes for real-phased images, allowing correct image algebra and measurements for T2 constants from any specific ROI on the image.
    • 通过多回波成像实验(MSME)提供的NMR自旋 - 自旋松弛参数的精确测定需要首先处理相位校正幅度。 本发明涉及一种用于相位校正过程的简单且鲁棒的算法,将在FFT重建之后并在任何拟合衰减方法之前应用。 该算法是逐像素算法,包括以下步骤:确定来自复幅度值的线性拟合,定义相对于实轴的旋转角度,优化角度,以及通过对所考虑的像素的振幅施加旋转 所有回波图像。 该算法为实相图像提供相位校正幅度,允许从图像上的任何特定ROI获得T2常数的正确图像代数和测量。