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    • 95. 发明授权
    • Method and device for processing of medical image data
    • 用于处理医学图像数据的方法和装置
    • US6151378A
    • 2000-11-21
    • US274390
    • 1999-03-23
    • Volker RascheMichael GrassHenning Braunisch
    • Volker RascheMichael GrassHenning Braunisch
    • G06T1/00G06T11/00A61B6/03
    • G06T11/006Y10S378/901
    • The invention relates to a method and a device for the processing of medical image data so as to determine output function data (S(k)), situated at grid points (8) of a selected grid, from input function data (I.sub.c (r)) situated at grid points (2, 7) of a Cartesian grid (1, 6). A method of this kind is used, for example in magnetic resonance tomography or computer tomography, so as to calculate arbitrary projections from given function data. The method of the invention includes the following steps: determination of modified input function data (I.sub.c '(r)) by division of the input function data (I.sub.c (r)) by the Fourier transform (c(r)) of a convolution kernel (C(k)), determination of the Fourier transform (S.sub.c '(k)) of the modified input function data (I.sub.c '(r)), and determination of the output function data (S(k)) by convolution of the Fourier transform (S.sub.c '(k)) of the modified input function data with the convolution kernel (C(k)), the convolution kernel (C(k)) being a weighting function for weighting the grid points (2, 7) of the Cartesian grid (1, 6) in conformity with their distance from grid points (8) of the selected grid. The method according to the invention offers essentially a substantial reduction of the calculation time required.
    • 本发明涉及一种用于处理医学图像数据的方法和装置,以便根据输入函数数据(Ic(r(k))确定位于所选网格的网格点(8)处的输出函数数据 ))位于笛卡尔网格(1,6)的网格点(2,7)处。 使用这种方法,例如在磁共振断层摄影或计算机断层摄影中,以便从给定的功能数据计算任意的投影。 本发明的方法包括以下步骤:通过将输入函数数据(Ic(r))除以卷积核的傅立叶变换(c(r))来确定修改后的输入函数数据(Ic'(r)) (C(k)),修正输入函数数据(Ic'(r))的傅里叶变换(Sc'(k))的确定以及输出函数数据(S(k))的确定, 通过卷积核(C(k))的修正输入函数数据的傅立叶变换(Sc'(k)),卷积核(C(k))是用于对网格点(2,7)进行加权的加权函数 笛卡尔网格(1,6)与其与所选网格的网格点(8)的距离。 根据本发明的方法基本上提供了所需的计算时间的显着减少。