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Regularization correction method of magnetic resonance phase array coil image uniformity

A phased array coil, image uniform technology, applied in image enhancement, image data processing, instruments and other directions, can solve the problem of uneven reconstructed image, affecting the automatic segmentation and registration of the doctor's diagnosis image, achieve good uniformity, improve Uniform, computationally simple effects

Inactive Publication Date: 2012-06-27
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0006] The invention provides a method for regularizing and correcting the image uniformity of a magnetic resonance phased array coil, the purpose of which is to solve the problem that the received signal is modulated by the position-related sensitivity of the coil unit when the phased array coil is used as the receiving coil in magnetic resonance , the reconstructed image is uneven, which affects the doctor's diagnosis and the automatic segmentation and registration of the later image.

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  • Regularization correction method of magnetic resonance phase array coil image uniformity
  • Regularization correction method of magnetic resonance phase array coil image uniformity
  • Regularization correction method of magnetic resonance phase array coil image uniformity

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Embodiment

[0031] Example: Phased Array Head Coil Pair Charged with CuSO Using Four Channels 4 The F23 homogeneous water model of the solution was imaged under 1.5T MRI, and the scanning sequence was FSE sequence (TR / TE=3000 / 100, ETL=20, Matrix size=256×256, FOV=220mm), figure 1 For the uneven image after scanning without using the method of the present invention, figure 2 For the gray distribution curve of the middle row of the image, it can be seen from the figure that the image obtained from the uniform water model has a large unevenness.

[0032] A Regularization Correction Method for Image Homogeneity of Magnetic Resonance Phased Array Coils

[0033] The main technical points involved in the invention are as follows:

[0034] 1. Calculation of coil sensitivity volume data:

[0035] Low-resolution multi-slice pre-scans of 3D sequences were performed using a homogeneous gross coil (in superconducting magnetic resonance) and an imaging coil, respectively. In order to improve the p...

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Abstract

Based on a theory that a reconstructed image in magnetic resonance is modulated by a phased array coil unit sensitivity, the invention provides a regularization correction method of a magnetic resonance phase array coil image uniformity. According to the method of the invention, a general coil with the uniform sensitivity in the superconductive magnetic resonance and each phased array imaging coil channel are used to carry out pre-scan so as to obtain the coil sensitivity. Through introducing a regular function, noise of the reconstructed image can be inhibited. Simultaneously, in the superconductive resonance, the general-coil pre-scan image is taken as a reference image in a regularization function so that the good uniformity can be obtained. A calculating speed is very fast. The method has little influence on image reconstruction time.

Description

Technical field: [0001] The invention mainly relates to a method for regularizing and correcting the image uniformity of a magnetic resonance phased array coil, which belongs to the technical field of magnetic resonance imaging. Background technique: [0002] Magnetic resonance imaging (MRI) has been widely used in clinical practice due to its advantages of no radiation, high resolution, multi-directional and multi-parameters. Image uniformity is a key indicator for measuring MRI imaging systems. Image inhomogeneity will not only directly affect the accuracy of the doctor's diagnosis, but also adversely affect the use of image post-processing techniques such as automatic image segmentation. [0003] Image inhomogeneity means that in different local areas of the same tissue in the image, the mean and variance of image pixel gray values ​​or other image characteristics have great deviations. The uniformity of MRI images is usually affected by many factors, such as the unifor...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 郭红宇
Owner SHENYANG POLYTECHNIC UNIV
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