Echo planar imaging sequence image reconstruction method

An echo plane imaging and sequence image technology, which is applied in the measurement of magnetic variables, measurement devices, instruments, etc., and can solve the problems of long acquisition time, poor effect, and inability to correct image deformation.

Active Publication Date: 2014-09-10
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0009] In order to solve the problems of poor elimination of N/2 artifacts, inability to correct image distortion, and long acquisition time in the e

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[0073] In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0074] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways than those described herein, and thus the present invention is not limited by the specific embodiments disclosed below.

[0075] As mentioned in the background art, in the process of echo plane imaging sequence image reconstruction, due to the difference in the positive and negative polarities of the readout gradient, the readout data is not completely consistent, such as the echo center is inconsistent, each line in K space The interval of the lines is not equal, which is an N / 2 artifact on the image. At the same time, due ...

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Abstract

The invention provides an echo planar imaging sequence image reconstruction method comprising the following steps: acquiring echo planar imaging data Si and simultaneously acquiring three non-phase-encoded reference echo signals R1, R2 and R3; working out a parameter required for correcting the echo planar imaging data according to the reference echo signals; performing one-dimensional Fourier transform on the echo planar imaging data along a readout direction to obtain a transform result FSi, correcting FSi with the use of the correction parameter, and working out corrected echo planar imaging data; and performing one-dimensional Fourier transform on the corrected echo planar imaging data along a phase encoding direction to obtain an image. According to the echo planar imaging sequence image reconstruction method provided by the invention, in the presence of a stray field, the quick imaging advantage of echo planar sequence imaging can be kept, N/2 artifacts can be effectively removed, and image deformation due to the existence of the stray field can be corrected.

Description

【Technical field】 [0001] The invention relates to the field of magnetic resonance imaging, in particular to a method for reconstructing an echo plane imaging sequence image. 【Background technique】 [0002] In the current magnetic resonance imaging process, the echo plane imaging sequence is a fast magnetic resonance imaging sequence that only requires a single excitation pulse to obtain a complete image. The magnetic resonance gradient system is periodically transformed to produce a series of gradient echoes; the image of the stimulated plane is obtained by applying a Fourier transform to the resulting echo sequence. [0003] In conventional echo plane imaging, the phase-encoding gradient and frequency-encoding gradient of the sequence are respectively as follows figure 1 A and b represented in , due to imperfect hardware system, such as eddy current, data acquisition delay, magnetic field drift, etc., there are differences in the data read out under positive and negative f...

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Application Information

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IPC IPC(8): G01R33/565
Inventor 张卫国吴环蒋先旺
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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