Image distortion correcting method and device based on image contour

A technology for image distortion correction and image contour, which is applied in image enhancement, image data processing, instruments, etc. It can solve the problems of increased scanning time, large difference in image contrast, and different degree and types of image distortion. shadow, the effect of increasing the scan time

Inactive Publication Date: 2012-07-04
北京海思威科技有限公司
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Problems solved by technology

[0014] However, as mentioned above, diffusion-weighted imaging usually needs to acquire multiple images with different b values, resulting in large differences in image contrast; in addition, different b values ​​and methods cause different eddy current field distributions, resulting in different degrees and types of image distortions. Exactly the same, image distortion correction has to be done image by image separately, which brings extra reference scan and increases scan time

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  • Image distortion correcting method and device based on image contour
  • Image distortion correcting method and device based on image contour
  • Image distortion correcting method and device based on image contour

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[0057] The method and device for correcting image distortion according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, some specific details, such as specific components, steps, and specific parameters in the embodiments, are used to provide a better understanding of the embodiments of the present invention. The invention is not limited to these specific elements, steps or parameters. In addition, specific descriptions of algorithms, means, etc. known in the prior art are omitted. It will be understood by those skilled in the art that the embodiments of the present invention can be practiced even without some details or combinations of other elements, steps, parameters, etc.

[0058] In order to clearly and briefly describe the embodiments of the present invention, the following mainly uses the diffusion weighted echo planar imaging (DW-EPI) technique in magnetic resonance...

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Abstract

The embodiment of the invention discloses an image distortion correcting method and device. The method comprises the following steps of: extracting an image contour of a source image; obtaining distortion information according to the image contour; and correcting the source image by using the distortion information so as to register the source image with a target image. By using the method and device, disclosed by the invention, the influences of the contrast, b value, direction variation and the like in a diffusion weighted magnetic resonance image on the correction are avoided; moreover, additional reference scanning is not needed so that convenient, fast and accurate image distortion correction is realized.

Description

technical field [0001] The invention relates to the field of diffusion weighted imaging, in particular to a method and a device for correcting distortion of an image formed by diffusion weighted imaging. Background technique [0002] Diffusion imaging is a very clinically valuable fMRI technique that detects the biological properties of water molecules or other molecules that can be diffused in human tissue with diffusion imaging in MRI equipment, thereby detecting many routine medical Lesions that cannot be found by imaging means (Non-Patent Document 1). Diffusion imaging is usually implemented using an echo planar imaging (EPI) sequence. The imaging speed of the EPI sequence is very fast, but it is easily affected by various artifacts, especially image distortion (Non-Patent Documents 2 and 3). In the EPI sequence, due to the main The image distortion caused by the additional magnetic field ΔB caused by the non-uniformity of the magnetic field in the frequency encoding di...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 周堃包尚联
Owner 北京海思威科技有限公司
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