Multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling

An imaging method and under-sampling technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as slow speed of magnetic resonance imaging, and achieve the effects of improving use efficiency, saving use cost, and speeding up

Active Publication Date: 2015-03-25
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a multi-layer magnetic resonance fast imaging method based on adjacent layer information and under-sampling for the problem that the above-mentioned magnetic resonance imaging speed exists in the prior art.

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  • Multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling
  • Multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling
  • Multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling

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Embodiment 1

[0026] A multilayer magnetic resonance fast imaging method based on adjacent layer information and undersampling, comprising the following steps:

[0027] Step 1. Perform a full sampling scan on the first layer of the layer sequence that needs to be scanned, and reconstruct the image through Fourier transform;

[0028] Step 2, enter the scanning of the next layer, analyze the K-space data of the previous layer adjacent to the current scanning layer, and obtain the position information of the local large signal point and the global large signal point;

[0029] Step 3. According to the position information of the global large signal point and the local large signal point obtained in step 2, plan the undersampling scanning trajectory of the current level;

[0030] Step 4. Scan the current level according to the under-sampled scanning trajectory obtained in step 3 to obtain the under-sampled K-space data of the current level;

[0031] Step 5, the undersampled K-space data obtaine...

Embodiment 2

[0039] Step 1. The number of mouse head scanning layers is 5 layers, the thickness of each layer is 0.4mm, and the resolution is 128*128. Firstly, for the first layer that needs to scan the layer sequence, use the spin echo (SE) sequence, set TR=2s, TE=8.667ms, and the sampling trajectory is Cartesian sampling method, and perform full sampling scanning to obtain the K-space data. Fourier transform reconstruction image;

[0040] Step 2. Enter the scan of the next layer, calculate the amplitude value of the K-space data of the previous layer adjacent to the current scanning layer, and obtain the local large point positions of the eight neighborhoods and the global large point in the K-space of the previous layer through statistics. point location. After statistics, the number of local large signal points in the eight neighborhoods in K space accounts for 15% of the total number of points, and the number of selected global large signal points is consistent with the number of loc...

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Abstract

The invention discloses a multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling. The method includes: firstly, acquiring distribution positions of local large signal points and global large signal points of a K-space from a scanned layer adjacent to a to-be-scanned layer; secondly, planning an undersampling scan track of the to-be-scanned layer according to the distribution positions to complete scanning; finally, adopting a nonlinear conjugate gradient iterative method for image reconstruction by aiming at norm minimization for optimizing undersampling data in a sparse transform domain. The multi-layer magnetic resonance fast imaging method based on adjacent layer information and undersampling has the advantages that scanning time is shortened by reduction of sampling points, and imaging quality and stability are improved by guidance of information of the adjacent layer.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging (Magnetic Resonance Imaging, MRI), in particular to a multi-layer magnetic resonance fast imaging method based on adjacent layer information and under-sampling. Background technique [0002] Magnetic resonance imaging is an imaging technology that utilizes the nuclear magnetic resonance phenomenon that occurs when the atomic nuclei in a substance are excited by radio frequency pulses in a magnetic field to generate magnetic resonance signals, which are processed by an electronic computer to reconstruct an image of the internal structure of the substance. As a new medical imaging diagnostic technology, magnetic resonance imaging has developed rapidly in recent years. Magnetic resonance imaging is non-radioactive and generally provides more information than other imaging techniques, which can better support disease diagnosis. [0003] However, compared with other medical imaging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
CPCA61B5/055
Inventor 吕植成周欣孙献平刘买利叶朝辉阮伟伟
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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