Dynamic MRI (Magnetic Resonance Imaging) construction system based on non-convex low rank

Abstract

The invention provides a dynamic MRI construction system based on non-convex low rank, comprising an imaging module and a processing module, the imaging module comprising a primary magnet for providing an external magnetic field, a gradient coil for providing a secondary magnetic field, an RF transmission unit for applying an RF pulse sequence, and an RF receiving unit for receiving the RF pulse sequence, the RF receiving unit is used for receiving signals excited by protons under the action of a magnetic field and RF pulses, and the processing module is used for controlling an RF pulse sequence applied by the RF transmission unit and performing image construction processing on the received signals; when the system constructs an image, the image tensor is iteratively processed and is calculated by using a cost function to obtain the image tensor with a low-rank characteristic, so that the constructed image is clearer on the premise of no distortion.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a dynamic MRI construction system based on non-convex low rank. Background technique [0002] When using nuclear magnetic resonance to acquire images in the body of an object, since each organ is active and in a non-stationary state, the obtained images will appear ghosting, which is not conducive to observing the state in the body. Now a dynamic MRI construction system is needed to obtain The image can eliminate ghosting under the premise of no distortion, and more clearly reflect the state of the body; [0003] Many MRI construction systems have been developed now. After a lot of searches and references, we found that the existing construction systems, such as the systems disclosed in the publication numbers KR1020100131151A, KR1020140070060A, CN107037385B and KR101378875B1, can obtain multiple MRI images for each pixel of the MRI image. The physical parameter values ​​of the s...

AI Technical Summary

Problems solved by technology

[0002] When using nuclear magnetic resonance to obtain images in the subject's body, since each organ is active and in a non-stationary state, the obtained image will appear ghosting, which is not conducive to observing the state in the body. Now a dynamic MRI construction system is needed, so that the obtained The image eliminates ghosting without distortion, and more clearly reflects the state of the body;

[0003] Many MRI construction systems have been developed now. After a large number of searches and references, we found that the existing construction systems are such as the systems disclosed in the publication numbers KR1020100131151A, KR1020140070060A, CN107037385B and KR101378875B1, which can obtain multiple MRI images for each pixel of the MRI image. The physical parameter value of the signal is used to construct a multi-dimensional data matrix, that is, a virtual MRI digital object; the virtual MRI data acquisition and image reconstruction are performed to obtain a virtual MRI image using the virtual MRI digital object as a scanning sample; the virtual MRI digital object is used as a scanning sample, using different The imaging sequence and sequence parameters are used to collect virtual data of different sections to obtain atlases with different weights, and to reconstruct two-dimensional or three-dimensional images. However, this system cannot handle ghosting well, and the clarity of the images needs to be improved.

Images