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Image distortion correction method based on single sweep quadrature space-time coding magnetic resonance imaging

A technology of orthogonal space-time coding and image distortion correction, which is applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problem of image quality degradation and achieve good stability and high efficiency

Active Publication Date: 2014-06-25
XIAMEN UNIV
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Problems solved by technology

Although spatial coding can present better image quality due to its robustness to inhomogeneous fields compared with echo-planar images, the image quality will also degrade under inhomogeneous fields, especially when there are severe B 0 When an inhomogeneous field exists

Method used

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  • Image distortion correction method based on single sweep quadrature space-time coding magnetic resonance imaging
  • Image distortion correction method based on single sweep quadrature space-time coding magnetic resonance imaging

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Embodiment

[0053]We demonstrate the single-scan orthogonal space-time encoding method and the distortion correction based on this method on live SD rats to verify the feasibility of the present invention. Experimental tests were performed on a Varian7T imager (Agilent Technologies, Santa Clara, CA, USA). The imaging sample used in the experiment was about 250 grams of living SD rats. Before the experiment, the rats were injected with 10% chloral hydrate solution at a ratio of 0.4mg / 100g to anesthetize the rats. experiment of. Before the experiment, the rat was fixed on the experimental bed and then introduced into the imager. On the operating table of the magnetic resonance imager, open the corresponding operating software of the imager, and locate the rat site of interest. Here we choose to perform coronal imaging on the brain of the rat. After the imaging area is positioned, we perform tuning, automatic shimming, frequency and power correction. Although the automatic shimming is per...

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Abstract

The invention discloses an image distortion correction method based on single sweep quadrature space-time coding magnetic resonance imaging. The method comprises steps of enabling protons to spin in the space to obtain a secondary phase related to the space position in the triggering stage by combining 90-degree and 180-degree linear sweep frequency pulse (chirp pulses) with an orthogonally distributed space encoding gradient, in a sampling stage, performing data sampling through positive and negative gradient echo train lengths which switch quickly to quickly obtain T2-weighted spatial domain magnetic resonance imaging data, performing reconstruction and correction on the distorted magnetic resonance images through a reconstruction algorithm of high resolution and an image distortion correction method so as to obtain a quality magnetic resonance image with high resolution. The image distortion correction method based on quadrature space-time coding magnetic resonance imaging provided by the invention can not only perform distortion correction according to own data without extra reference scanning, but also have capabilities of resisting a non-uniform field and operating normally in a strong non-uniform field.

Description

technical field [0001] The invention relates to a magnetic resonance imaging method, in particular to an image distortion correction method for magnetic resonance imaging. Background technique [0002] In magnetic resonance imaging, people have been striving to increase the imaging speed or improve the imaging resolution within a fixed time. Ultra-fast imaging technology plays an important role in some experiments that require high time resolution, such as functional MRI (fMRI), free-breathing heart imaging (free-breathing heart imaging), and some high-dimensional experiments, such as diffusion tension. Diffusion tensor imaging (DTI). Among many ultra-fast methods, single-scan echo planar imaging (EPI) has become the most popular ultra-fast imaging technology due to its high time resolution. It is well known that echo-planar imaging can fill the entire k-space with a single shot by sampling through a series of echo train gradients. However, this sampling method is easily ...

Claims

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Application Information

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IPC IPC(8): G01R33/565
Inventor 蔡淑惠李敬蔡聪波陈林陈忠
Owner XIAMEN UNIV
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