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Image reconstruction method in NMR imaging
Image reconstruction method in NMR imaging
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机译:核磁共振成像中的图像重建方法
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摘要
According to this invention the requirement for the amplitude of the oscillating gradient magnetic field is relaxed by reconstructing an image while using simultaneously echoes SP(kx, y) produced in the case where the positive oscillating gradient magnetic field (Gx) is applied to the object to be tested and echoes SN(kx, y) produced in the case where the nagative is applied thereto, i.e. by using data points on segments of a trajectory of data points ascending from left to right in the spatial frequency domain (kx, ky) and those on segments of a trajectory of data points ascending from right to left. That is, the image M(x, y) is obtained by Fourier-transforming at first the echoes SP(kx, ky) and SN(kx, ky) with respect to ky; multiplying complex numbers a₁ and a₂ to gP(kx, y) and gN(kx, y) obtained by this transformation; adding the results thus obtained, i.e. forming g(kx, y) = a₁ gP(kx, y) + a₂ gN(kx, y); and finally Fourier-transforming this g(kx, y) with respect to kx.
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机译:根据本发明,通过同时使用在将正振荡梯度磁场(Gx)施加到物体上产生的回波SP(kx,y)的同时重建图像,来放松对振荡梯度磁场的振幅的要求。进行测试并回波在应用负数的情况下产生的SN(kx,y),即通过在空间频域(kx,ky)中从左向右升序的数据点轨迹的段上使用数据点数据点轨迹线段上的那些从右到左递增。即,图像M(x,y)是通过首先相对于ky通过回波SP(kx,ky)和SN(kx,ky)的傅立叶变换而获得的。通过该变换获得的复数a 1和a 2乘以gP(kx,y)和gN(kx,y);加上由此获得的结果,即形成g(kx,y)= a 1 gP(kx,y)+ a 2 gN(kx,y);最后,相对于kx对该g(kx,y)进行傅立叶变换。
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