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公开(公告)号：EP0329299B1
公开(公告)日：1996-07-17
申请号：EP89300892.0
申请日：1989-01-30
IPC分类号： G01N24/08
CPC分类号： G01R33/56545 , G01R33/561
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公开(公告)号：EP0453102A3
公开(公告)日：1992-08-26
申请号：EP91302528.4
申请日：1991-03-22
CPC分类号： G01R33/56
摘要： Magnetic resonance imaging data lines or views are generated and stored in a magnetic resonance data memory (56). The number of views or phase encode gradient steps N along each of one or more phase encode gradient directions is selected (70) to match the dimensions of the region of interest. A discrete Fourier transform algorithm operates on the data in the magnetic resonance data memory to generate an image representation for storage in an image memory (96). Unlike a fast Fourier transform algorithm which requires a N views or data lines, where a and N are integers, the discrete Fourier transform has a flexible number of data lines and data value which can be accommodated. In preferred embodiments, the discrete Fourier transform operation is performed by a CHIRP-Z transform or a Goertzel's second order Z-transform which can accommodate any number of data lines or values.
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3.发明公开Magnetic resonance imaging methods and apparatus 失效Apparat und Verfahren zur Bilderzeugung mittels magnetischer Resonanz。
公开(公告)号：EP0329299A2
公开(公告)日：1989-08-23
申请号：EP89300892.0
申请日：1989-01-30
IPC分类号： G01N24/08
CPC分类号： G01R33/56545 , G01R33/561
摘要： An incomplete set of three dimensinal magnetic resonance data (F(k₁, k₂, k₃) is collected and stored in acquired data memory (60). The incomplete data set is complete with respect to first and second directions and incomplete with respect to a third direction. However, the acquired data set has data along the third direction between ±n central values and half the remaining values. One dimensional inverse Fourier transforms (64, 66) are performed with respect to the first and second directions to create an intermediate data set (68). A phase correction array or plurality of phase correction vectors p( r ) are generated from the intermediate data and stored in a phase correction memory (82). A symmetric data set (100) is created as the complex conjugate of the intermediate data set. The intermediate and symmetric data sets are one dimensionally inverse Fourier transformed (92, 104) with respect to the third direction one vector at a time to produce vectors of first and second complex image arrays (f A , F S ) corrected (96, 108) with the corresponding phase correction vector, and combined (110) into a line of a resultant three dimensional image representation (112).
摘要翻译： 收集三维磁共振数据（F（k1，k2，k3）的不完整的集合并存储在获取数据存储器（60）中，不完整的数据集相对于第一和第二方向完成，并且相对于第三 然而，所获取的数据集具有在+/- n个中心值和剩余值的一半之间沿着第三方向的数据，相对于第一和第二方向执行一维傅里叶逆变换（64,66）以产生 中间数据组（68），从中间数据生成相位校正阵列或多个相位校正矢量p（r），并存储在相位校正存储器（82）中，创建对称数据组（100）作为复数 中间数据集和中间数据集合的中间数据集和对称数据集相对于第三方向一次性地逆向傅立叶变换（92,104），一次一个向量，以产生第一和第二复数ima的向量 （96A）与相应的相位校正矢量进行校正（fA，FS），并将其组合（110）到所得到的三维图像表示（112）的一行中。
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4.发明公开Magnetic resonance imaging methods and apparatus 失效Apparat und Verfahren zur magnetischen Resonanzabbildung。
公开(公告)号：EP0453102A2
公开(公告)日：1991-10-23
申请号：EP91302528.4
申请日：1991-03-22
CPC分类号： G01R33/56
摘要： Magnetic resonance imaging data lines or views are generated and stored in a magnetic resonance data memory (56). The number of views or phase encode gradient steps N along each of one or more phase encode gradient directions is selected (70) to match the dimensions of the region of interest. A discrete Fourier transform algorithm operates on the data in the magnetic resonance data memory to generate an image representation for storage in an image memory (96). Unlike a fast Fourier transform algorithm which requires a N views or data lines, where a and N are integers, the discrete Fourier transform has a flexible number of data lines and data value which can be accommodated. In preferred embodiments, the discrete Fourier transform operation is performed by a CHIRP-Z transform or a Goertzel's second order Z-transform which can accommodate any number of data lines or values.
摘要翻译： 产生磁共振成像数据线或视图并将其存储在磁共振数据存储器（56）中。 选择（70）沿着一个或多个相位编码梯度方向中的每一个的视图的数量或相位编码梯度步骤N以匹配感兴趣区域的尺寸。 离散傅立叶变换算法对磁共振数据存储器中的数据进行操作以产生用于存储在图像存储器（96）中的图像表示。 与需要N视图或数据线的快速傅里叶变换算法不同，其中a和N是整数，离散傅立叶变换具有灵活数量的数据线和可以容纳的数据值。 在优选实施例中，通过CHIRP-Z变换或Goertzel的二阶Z变换来执行离散付里叶变换操作，该Z变换可以适应任何数量的数据线或值。
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公开(公告)号：EP0845684A1
公开(公告)日：1998-06-03
申请号：EP97309010.3
申请日：1997-11-10
IPC分类号： G01R33/561
CPC分类号： G01R33/56554 , G01R33/56545
摘要： A transmitter (24) and gradient amplifiers (20) transmit radio frequency excitation and other pulses to induce magnetic resonance in selected magnetic dipoles and cause the magnetic resonance to be focussed into a series of echoes (66) at each of a plurality of preselected echo positions following each excitation. A receiver (38) converts each echo into a data line. Calibration data lines having a close to zero phase-encoding are collected and used to generate correction parameters (102) for each of the echo positions. These parameters include relative echo centre positions (96) and unitary complex correction vectors (106) . The calibration data lines for each of the preselected positions are one-dimensionally Fourier transformed ( 82 ) and multiplied ( 90 ) by the same complex conjugate reference echo (80) . These data lines are then inverse Fourier transformed (92) to generate an auxiliary data array (94) . A relative echo centre position is computed (96) which represents a fractional shift of the true centre relative to the reference echo. A complex sum is computed (104) from the relative echo centre position and normalised (106) to generate a unitary correction vector. The phase-correction parameters are used to phase-correct (116) imaging data lines. The phase-corrected imaging data lines are sorted (122) to build an image plane which is one-dimensionally Fourier transformed (128) in the phase-encoding direction to produce a final corrected image (130) for display on a monitor (134) .
摘要翻译： 发射机（24）和梯度放大器（20）发射射频激励和其它脉冲，以诱发磁共振在选择的磁偶极子，并导致磁共振在每个预选的回波的多个被聚焦成一系列回波（66）的 继位的各激励。 一种接收机（38），转换每个回波到数据线。 具有接近相位编码零校准数据线被收集并用于产生针对每个回波位置的校正参数（102）。 这些参数包括相对于回波中心位置（96）和整体的复杂校正矢量（106）。 对于每个预先选择的位置的校准数据线是由相同的复共轭参考回波（80）转化（82）的一维傅立叶和相乘（90）。 这些数据线然后逆傅里叶变换（92），在辅助数据阵列（94）来生成。 的相对回波中心位置被计算（96）其中darstellt真相对于基准回波中心的部分移位。 复数总和被计算（104）从相对回波中心位置和获救（106），以产生一个单一的校正向量。 相位校正参数用于进行相位正确（116）成像的数据线。 相位校正后的成像数据线排序（122），以建立一个图像平面中的所有其是转化的一维傅立叶（128）中的相位编码方向，以产生在监视器上进行显示的最终校正的图像（130）（134） ，
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公开(公告)号：EP0329299A3
公开(公告)日：1991-01-09
申请号：EP89300892.0
申请日：1989-01-30
IPC分类号： G01N24/08
CPC分类号： G01R33/56545 , G01R33/561
摘要： An incomplete set of three dimensinal magnetic resonance data (F(k₁, k₂, k₃) is collected and stored in acquired data memory (60). The incomplete data set is complete with respect to first and second directions and incomplete with respect to a third direction. However, the acquired data set has data along the third direction between ±n central values and half the remaining values. One dimensional inverse Fourier transforms (64, 66) are performed with respect to the first and second directions to create an intermediate data set (68). A phase correction array or plurality of phase correction vectors p( r ) are generated from the intermediate data and stored in a phase correction memory (82). A symmetric data set (100) is created as the complex conjugate of the intermediate data set. The intermediate and symmetric data sets are one dimensionally inverse Fourier transformed (92, 104) with respect to the third direction one vector at a time to produce vectors of first and second complex image arrays (f A , F S ) corrected (96, 108) with the corresponding phase correction vector, and combined (110) into a line of a resultant three dimensional image representation (112).
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