Chemical shift coding imaging method and device
A technology of chemical shift and imaging method, which is applied in the direction of measuring device, using nuclear magnetic resonance imaging system for measuring, using magnetic variable measurement, etc., can solve the problems of poor water and fat separation effect and low accuracy, and achieve improved effect and accuracy degree of effect
Active Publication Date: 2019-05-07
SHANGHAI UNITED IMAGING HEALTHCARE
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[0008] In view of this, an embodiment of the present invention provides a chemical shift encoding imaging method and device to solve the problem of poor water-fat separation due to the low accuracy of field map estimation in the prior art
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035] figure 1 The flow chart of the implementation of the chemical shift encoding imaging method provided by the embodiment of the present invention is shown, and the details are as follows:
[0036] In step S101, the magnitude of each pixel in the first image is determined, and a phase factor fitting error spectrum corresponding to each pixel is generated.
[0037] For the convenience of description, in the embodiment of the present invention, the water-fat separation imaging is taken as an example to illustrate the multi-echo chemical shift encoding imaging. The simplified MR (Magnetic Resona...
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The invention is suitable for the technical field of magnetic resonance imaging, and especially relates to a chemical shift coded imaging method and device. The Chemical shift coded imaging method comprises determining the amplitude of each pixel in a first image and a phase factor fitting error spectrum; marking a pixel as a seed point when the amplitude of the pixel is larger than a first parameter value and a unique local minimum value in the phase factor fitting error spectrum is smaller than a second parameter value, and determining the phase factor value of the seed point in dependence on the unique local minimum value; marking a pixel as a pixel point to be estimated when the amplitude of the pixel is smaller than or equal to the first parameter value or a plurality of local minimum values in the phase factor fitting error spectrum are smaller than the second parameter value; determining the phase factor value, of the pixel point to be estimated, which has maximum comparability with the phase factor values of the surrounding seed points; and obtaining a field pattern corresponding to the first image in dependence on the phase factor values of the seed points and the pixel points to be estimated. According to the invention, the field pattern estimating accuracy is improved, and therefore the water-fat separation effect is improved.
Description
technical field [0001] The invention belongs to the technical field of magnetic resonance imaging, in particular to a chemical shift encoding imaging method and device. Background technique [0002] Magnetic resonance chemical shift encoding imaging is an imaging method based on the chemical shift difference between components in the tissue, which is obtained by collecting signals at different echo times and fitting a mixed signal model. The most commonly used chemical shift-encoded imaging in clinical practice is hydrolipid separation imaging, which is mainly used in applications such as fat suppression and fat quantification. Main magnetic field B 0 When uniform, B 0 The field map changes continuously and slowly. Currently, the greatest challenge to multiecho chemical shift-encoded imaging is the B 0 Therefore, the separation effect of this technology on water-lipid separation imaging depends on its B 0 The accuracy of the field map estimates. [0003] Multi-echo che...
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IPC IPC(8): G01R33/48G01R33/485
CPCG01R33/4828G01R33/485
Inventor 郑海荣刘新程传力邹超
Owner SHANGHAI UNITED IMAGING HEALTHCARE