Background phase extracting method and system

An extraction method and background phase technology, applied in the field of magnetic resonance imaging, can solve problems such as unstable measurement accuracy

Active Publication Date: 2014-07-09
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a background phase extraction method, which aims to solve the probl...

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  • Background phase extracting method and system
  • Background phase extracting method and system

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Embodiment Construction

[0036] In order to make the object, technical solution and beneficial effects of the present invention more clear, 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.

[0037] A method for extracting background phase provided by a specific embodiment of the present invention, the phase map in the method is divided into: a fitting area and a fitted area, the method is as follows figure 1 shown, including the following steps:

[0038] S11. Select any TE among the multi-echo time TEs of the acquired gradient echo sequence;

[0039] S12. Calculate the phase diagram of any TE to filter out magnetic susceptibility interference ;

[0040] S13, the phase diagram Perform polynomial fitting to get the coefficient {W n (m)}, will {W n (m)} into the phase d...

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Abstract

The invention is applicable to the field of communication, and provides a background phase extracting method. The method includes the steps of selecting and collecting any TE of a plurality of time of echo (TE) of a gradient echo sequence; calculating the phase diagram phi(x,y) of any TE filtering out magnetic susceptibility interference; fitting the phase diagram phi(x,y) of a polynomial to obtain the coefficient, substituting the coefficient to a phase diagram expression to obtain an expression of the phase diagram phi(x,y), and calculating to obtain the reference phase phi(x,y) of a fitted area according to the expression; calculating the complex difference delta phi between the original phase of the fitted area in the phase diagram at any TE and the reference phase; calculating to obtain the temperature change value delta T through delta phi, wherein the delta T is the final temperature image. The background phase extracting method has the advantages of eliminating impact from motion artifact, magnetic susceptibility artifact and the like, and being high in measurement accuracy.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, in particular to a background phase extraction method and system. Background technique [0002] Due to the advantages of small trauma, fast recovery, and strong targeting, ablation therapy has gradually become an important means of minimally invasive treatment for many clinical diseases, especially tumors. Ablation refers to the use of physical means such as radio frequency, laser, microwave, freezing or High Intensity Focused Ultrasound (HIFU) under the guidance of real-time images to heat or freeze local tissue to cause coagulation necrosis to achieve the purpose of treatment. Real-time monitoring of the temperature and ablation range of the target tissue during ablation therapy is the key to determining the success of the treatment. Among many medical imaging methods, Magnetic Resonance Imaging (MRI) is one of the most ideal image guidance and temperature monitoring methods for ablat...

Claims

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Application Information

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IPC IPC(8): A61B5/055
Inventor 何梦玥邹超帖长军郭文莎钟耀祖刘新
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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