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Method of correcting gradient deformation of magnetic resonant image based on spherical harmonic function

A technology of magnetic resonance image and spherical harmonic function, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, measurement of magnetic variables, etc.

Active Publication Date: 2007-10-03
SYMBOW MEDICAL TECH
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Problems solved by technology

This method is to calculate the correction parameters for image correction according to the design parameters of the gradient coil, but the design parameters of the gradient coil are only a main factor of image deformation, and the influence of other factors on image deformation is not considered, so the actual correction parameters There are still some differences with the design parameters

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  • Method of correcting gradient deformation of magnetic resonant image based on spherical harmonic function
  • Method of correcting gradient deformation of magnetic resonant image based on spherical harmonic function
  • Method of correcting gradient deformation of magnetic resonant image based on spherical harmonic function

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Embodiment Construction

[0058] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0059] The magnetic resonance image gradient deformation correction method based on the spherical harmonic function provided by the present invention is to calculate the three-dimensional offset of each pixel point on the image in the three-dimensional space according to the spherical harmonic function of the magnetic induction intensity, and calculate the offset The amount is compensated to the image coordinates of the pixel.

[0060] As shown in FIG. 1 , the present invention includes three parts: calculation of spatial offset, compensation and correction of image offset, and search for correction parameters.

[0061] 1. The steps to calculate the space offset are as follows:

[0062] (a) The magnetic field strength B of the magnetic resonance system z(r，θ，φ) In the spherical coordinate system can be expressed using formula 1.

[0063] B r(n，m) ...

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Abstract

The method of correcting gradient deformation of magnetic resonant image based on spherical harmonic function includes three steps of calculating spatial offset, compensating correction of image offset and searching correction of parameters. The 3D offset of each pixel in the 3D image is calculated based on the spherical harmonic function of magnetic induction intensity, and compensated to the image coordinate of the pixel. The present invention has high algorithm converging speed and high correction precision, and may be used widely magnetic resonant image led surgical treatment.

Description

technical field [0001] The invention relates to a magnetic resonance image gradient deformation correction method based on spherical harmonic functions. Background technique [0002] The nonlinearity of the gradient field will cause the geometric deformation of the image, and the geometric deformation of the image is different on different magnetic resonance imaging devices and in different fields of view (FOV) of the same magnetic resonance imaging device. Image correction for gradient field nonlinearity is necessary to improve the accuracy of MR image-guided surgery and the feasibility study of inter-MRI image studies. The basic process of magnetic resonance image gradient deformation correction is to first obtain the position offset of a limited number of control points in the imaging space of the magnetic resonance imaging equipment by a certain method, and then calculate the position of each pixel of the image to be corrected in the magnetic resonance imaging equipment....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/56G01R33/58
Inventor 赵磊代亮
Owner SYMBOW MEDICAL TECH
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