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Method for two-dimensional geometric correction of magnetic resonance image

A magnetic resonance image and geometric correction technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as inability to effectively extract control points, inability to estimate the deformation field of control points, etc., so as to overcome the limitations of regional conditions and achieve a good correction effect. Effect

Inactive Publication Date: 2013-04-03
EAST CHINA NORMAL UNIV +1
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Problems solved by technology

[0004] In view of the defects in the above-mentioned prior art that the control points cannot be effectively extracted and the deformation field beyond the coverage of the control points cannot be estimated, the present invention proposes a two-dimensional geometric correction method for magnetic resonance images, including:

Method used

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  • Method for two-dimensional geometric correction of magnetic resonance image
  • Method for two-dimensional geometric correction of magnetic resonance image
  • Method for two-dimensional geometric correction of magnetic resonance image

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Embodiment

[0066] In this embodiment, the water model is placed as figure 2 In the upper left position of the positioning board shown, the outer contour of the water model fits with the cross mark line, the scanning sequence used is tr_mpr_tra_p2_iso, the voxel is 1.0mm*1.0mm*1.0mm, the FOV is: 256mm*256*mm, The FOV center deviates from the magnet center R101.7mm, P18.8mm, H101.0mm, the number of layers collected is 144, and the data set Data1 is obtained.

[0067] Place the water model as figure 2 In the upper right position of the positioning board shown, the outer contour of the water model fits with the cross mark line, the scanning sequence used is tr_mpr_tra_p2_iso, the voxel is 1.0mm*1.0mm*1.0mm, the FOV is: 256mm*256*mm, The FOV center deviates from the magnet center by L120.7mm, P18.8mm, and H109.0mm, and the number of collected layers is 144, and the data set Data2 is obtained.

[0068] Place the water model as figure 2 In the lower right position of the positioning board...

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Abstract

The invention discloses a method for two-dimensional geometric correction of a magnetic resonance image. The method includes: forming a water model, and recording number and position information of mesh points of the water model to serve as number and position information of initial control points; collecting multiple water model images in different areas of the magnetic resonance image by the aid of the water model, and extracting the number and the position information of control points in each water model picture; enabling the controls points of the water model images to correspond to the mesh points of the water model; combining the multiple water model images according to the different areas of the magnetic resonance image, computing deformation quantity between the position information of the mesh points and the position information of the control points, and estimating a deformation field according to the deformation quantity; and correcting the magnetic resonance image according to the deformation field. The method has the advantages that a small-sized water model can be used for parameter-free correction of large-sized imaging areas, and a calibration process of magnetic resonance image correction is improved.

Description

technical field [0001] The invention relates to the field of magnetic resonance imaging, in particular to a method for two-dimensional geometric correction of magnetic resonance images. Background technique [0002] Geometric correction is a digital image processing technique that corrects images that are geometrically distorted. Geometric distortion widely exists in the edge of the TV screen, the edge of the camera lens and the magnetic resonance image, and the present invention specifically refers to the geometric distortion of the magnetic resonance image. The geometric distortion of the magnetic resonance image is mainly caused by the non-linearity of the gradient field generated on the hardware of the magnetic resonance imaging instrument, and the distortion is more serious in the region farther away from the center of the magnet. The geometric correction technology of magnetic resonance images is of great help to medical diagnosis. [0003] The usual method to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50
Inventor 何玉娇杨光昝国锋宁瑞鹏姜小平李建奇
Owner EAST CHINA NORMAL UNIV
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