Correction method and apparatus for magnetic resonance diffusion weighted imaging image

Abstract

In a correction method and apparatus for a magnetic resonance diffusion weighted imaging image, a diffusion weighted imaging image is corrected based on a launch site correction factor and / or a receiving field correction factor. The launch site correction factor is used for correcting inhomogeneity of a launch site, and the receiving field correction factor is used for correcting inhomogeneity of a receiving field. The imaging sequence of the diffusion weighted imaging image is thereby improved and the corresponding image reconstruction of the diffusion weighted imaging image, and the homogeneity of the diffusion weighted imaging image also can be improved, without measuring the intensity of the launch site, which significantly reduces the correction workload and is easy to automate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the field of medical appliances, and in particular to a correction method and apparatus for a magnetic resonance diffusion weighted imaging image.[0003]2. Description of the Prior Art[0004]Magnetic resonance diffusion weighted imaging (DWI) can detect water molecule diffusion motion in a viable tissue. The water molecule diffusion state (freedom and direction) in the tissue is detected by measuring the change in signal intensity of the tissue before and after applying a diffusion sensitive gradient field, and the detection result can indirectly reflect the tissue microscopic structure characteristics and changes thereof.[0005]DWI technology can be widely used for identifying infarction and other pathological states. However, inhomogeneous rotating magnetic field B1 causes inhomogeneous DWI image signal intensity, thereby decreasing image quality and easily causing misdiagnosis, and this ...

AI Technical Summary

Benefits of technology

The present invention provides a correction method and apparatus for magnetic resonance diffusion weighted imaging images. This method corrects the images using a launch site correction factor and / or a receiving field correction factor to improve the quality of the images and reduce the workload of the correction. The embodiments of the invention make it easier to improve the homogeneity of the images without measuring the intensity of the launch site B1+.

Problems solved by technology

However, inhomogeneous rotating magnetic field B1 causes inhomogeneous DWI image signal intensity, thereby decreasing image quality and easily causing misdiagnosis, and this defect is much more obvious in the case of a strong magnetic field.

However, measuring the intensity of the launch site B1+ will entail heavy workload, and therefore this correction method is difficult to implement and has a low degree of automation.

Images