Phase correction method and apparatus thereof, and magnetic resonance system
A phase correction and phase technology, applied in the field of medical imaging, can solve the problems of inaccurate image phase correction, inaccurate model establishment, and complex extraction methods, so as to improve accuracy, simplify extraction methods, and avoid inaccurate parameters.
Active Publication Date: 2017-10-24
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology
[0006] In the process of implementing phase correction in the existing technology, it is necessary to use a third-party database and extract homogeneous regions through organ segmentation methods, and the extraction method is complicated
In addition, when establishing a linear model, the linear model can only be determined according to the non-convoluted phase, resulting in inaccurate model establishment, which in turn makes the phase correction of the image inaccurate
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[0067] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0068] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0069] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.
[0070] It should be understood that the term "an...
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An embodiment of the invention provides a phase correction method and an apparatus thereof, and a magnetic resonance system and relates to the medical image technology field. The phase correction method comprises the following steps of firstly, acquiring a plurality of echo images; then, acquiring a pixel point image gradient of the plurality of echo images; secondly, according to the pixel point image gradient, acquiring a homogeneous area of the plurality of echo images; acquiring a pixel point phase and an amplitude of the homogeneous area; according to the pixel point phase and the amplitude, and based on a linear model of phase deviation, determining a linear model parameter and determining a first linear model of the phase deviation in a complex field; and then according to the first linear model of the complex field, correcting phases of the plurality of echo images. In the technical scheme, a complex degree of phase correction is reduced to some extent and accuracy of the phase correction is increased.
Description
【Technical field】 [0001] The invention relates to the technical field of medical imaging, in particular to a phase correction method, device and magnetic resonance system. 【Background technique】 [0002] In magnetic resonance imaging, the scanning measurement sequence (such as spin echo sequence, planar echo sequence, etc.) and the scanned object generate magnetic resonance signals. According to the magnetic resonance signals, MRI (Magnetic Resonance Imaging, magnetic resonance imaging) is established through image reconstruction. Images to show the different tissues of the scanned object. [0003] During the magnetic resonance imaging process, the changing magnetic field may generate eddy currents in the metal body, and the eddy currents will generate a magnetic field B1, which is opposite to the direction of the radio frequency emission field of the scanning sequence in the magnetic resonance system, so that the phase dispersion of the magnetic resonance signal occurs , t...
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Login to View More IPC IPC(8): G01R33/565
CPCG01R33/56518G01R33/56545G01R33/5608G06T5/50G06T2207/10088G06T5/70G06T2207/30168G06T7/251G06T7/269
Inventor 郭延恩张仲奇
Owner SHANGHAI UNITED IMAGING HEALTHCARE