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A method for correcting the grayscale distortion of nuclear magnetic resonance images

A nuclear magnetic resonance image, grayscale distortion technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc., can solve the problem of impossible real-time image reconstruction, and achieve the effect of improving reliability and imaging quality.

Active Publication Date: 2016-12-21
JIANGSU MAGSPIN INSTR
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Problems solved by technology

However, the calculation time of reconstruction will increase by N / log2N times compared with the usual FFT method, making real-time image reconstruction impossible

Method used

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  • A method for correcting the grayscale distortion of nuclear magnetic resonance images
  • A method for correcting the grayscale distortion of nuclear magnetic resonance images
  • A method for correcting the grayscale distortion of nuclear magnetic resonance images

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the method for correcting the gray scale distortion of the nuclear magnetic resonance image of the present invention will be described in detail below.

[0019] In MRI theory, image space (r=(x,y,z)) and k-space (k=(k x ,k y ,k z )) The connection takes place via the Fourier transform. After the scanning object is excited by the rf pulse, the three-dimensional gradient space encoding is added to generate an oscillating signal. The three-dimensional Fourier transform can be written as:

[0020] s(k)=∫ρ(r)e -i2πk·r d 3 r

[0021] ρ ^ ( r ) = ∫ s ( k ) e i 2 π k · r d ...

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Abstract

The invention discloses a method for correcting the grayscale distortion of nuclear magnetic resonance images. The method obtains linear items and high-order nonlinear items by performing spherical harmonic function expansion on nonlinear gradient fields, and obtains linear items and high-order nonlinear items through conventional fast The Fourier transform FFT calculates the non-uniformity of the gradient field, and the non-uniform mapping relationship between the geometric position of the image and the brightness, and then calculates the weighting coefficient between the nonlinearity of the gradient field and the distortion of the image gray level, so as to complete the image gray level Correction. Compared with the prior art, the method for correcting the gray scale distortion of the nuclear magnetic resonance image in the present invention can quickly realize the correction of the gray scale distortion of the nuclear magnetic resonance image, thereby improving the imaging quality and improving the reliability of clinical diagnosis. The field of MRI is of great importance.

Description

technical field [0001] The invention relates to nuclear magnetic resonance imaging, in particular to a method for correcting the gray scale distortion of the nuclear magnetic resonance image. Background technique [0002] In MRI systems, image quality depends on the accuracy of the spatial encoding of the imaged object. Stereotaxic brain surgery, brain atrophy and longitudinal measurement of functional brain imaging, among others, use image deformation and correspondingly magnetic field homogeneity as decisive factors. Magnetic field inhomogeneities that can cause image grayscale inhomogeneity include electromagnetic eddy currents, gradient inhomogeneities, and B 0 and non-uniformity of B1. [0003] The development trend of gradients in recent years is characterized by short-cavity designs and high-speed flipping, but these designs encounter the problem of thermal stimulation of nerve endings caused by large flipping currents. Especially in some applications such as EPI (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/565
Inventor 赵华炜
Owner JIANGSU MAGSPIN INSTR
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