Multidimensional magnetic resonance system using selective discrete
Fourier transformation (SDFT)
    4.
    发明授权
    Multidimensional magnetic resonance system using selective discrete Fourier transformation (SDFT) 失效
    使用选择性离散傅里叶变换(SDFT)的多维磁共振系统

    公开(公告)号:US5164670A

    公开(公告)日:1992-11-17

    申请号:US583914

    申请日:1990-09-17

    IPC分类号: G01R33/46 G01R33/56 G06F17/14

    摘要: Magnetic resonance data is generated as a set of digital signals in the time domain. Each signal represents a multiplicity of parameters (for example two or three dimensions in the frequency domain). Transformation of such multiparameter (multidimensional) time domain signals into the frequency domain to provide multidimensional spectra (in frequency or in space for resonance imaging) utilizes discrete Fourier transformation in a spectral region of interest by calculating matrix products of data points corresponding to successively spaced values of the time domain signal in sequence with data signals corresponding to successive frequency points to obtain the output spectra. To increase the efficiency of the calculations "zero padding" may be accomplished directly in the frequency domain reconstructing more or less data points there than the corresponding number of the acquired time domain points, to increase or decrease digital resolution. Small information rich regions of the spectra (e.g., 2D and 3D NMR spectra) may be produced, without reconstruction of the other part of the spectra, directly from the time domain data, with no intermediate transposition step, and greatly reduced computational resources (e.g., disk input/output (I/O)).

    摘要翻译: 在时域中产生磁共振数据作为一组数字信号。 每个信号表示多个参数(例如频域中的两个或三个维度)。 将这种多参数(多维)时域信号转换到频域以提供多维频谱(频率或空间用于共振成像)通过计算对应于连续间隔值的数据点的矩阵乘积,在感兴趣的频谱区域中利用离散傅里叶变换 的时域信号与对应于连续频点的数据信号顺序地获得输出光谱。 为了提高计算的效率,可以在频域中直接实现“零填充”,重建比所获取的时域点的相应数量更多或更少的数据点,以增加或减少数字分辨率。 可以直接从时域数据重建光谱的其他部分,没有中间转置步骤,大大减少了计算资源(例如,二维和三维核磁共振谱) ,磁盘输入/输出(I / O))。