Method for correcting geometrical distortion antifact in fMRI based on field map

A geometric distortion and multi-channel technology, applied in the field of graphics, can solve problems such as no correction method, difficulty in accurately registering structural images of functional magnetic resonance images, and wrong positioning of brain activation regions, so as to improve image quality and high signal-to-noise ratio , the correction effect is obvious
CN106204475AActive Publication Date: 2016-12-07XI AN JIAOTONG UNIV
2 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2016-12-07

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method for correcting a geometrical distortion antifact in an fMRI based on a field map. The method comprises the steps of reconstructing multi-channel phased array coil images (an amplitude image and a phase image), cutting the amplitude image to make a mask layer, carrying out phase unwrapping on the phase image, generating the field map, carrying out denoising of the field map, generating a voxel displacement diagram, and carrying out geometrical distortion correction. In the process of carrying out denoising of the field map, according to different noise sources, a corroded amplitude image is used to make the mask layer to remove edge noise and peak removing, median filtering and gauss smooth methods are used to remove internal noise, through the combination of two methods, the noise of the field map is removed effectively, the filed map is used to correct a function magnetic resonance image, the effect is obvious, the method is simple and efficient, the signal to noise ratio is high, and the image quality can be improved well.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of image processing, in particular to a method for correcting geometric distortion artifacts in fMRI based on a field map, in particular to multi-channel image reconstruction, amplitude map segmentation, phase map dewarping, and fieldmap generation and denoising, voxel displacement map generation and geometric distortion correction to realize the method of geometric distortion correction based on field map for functional nuclear magnetic resonance images. Background technique

[0002] fMRI is one of the main non-invasive methods to study brain activity and brain function, with millimeter-level spatial resolution. The proposal and development of the BOLD-fMRI method has made a breakthrough in the study of brain cognitive function, and it has become an important tool for neuroscience to explore the neural mechanism of the human brain. fMRI—generally refers to magnetic resonance imaging based on blood oxygen l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More