Plane echo imaging method and system

Abstract

Provided is a plane echo imaging method. The plane echo imaging method includes the follow steps: dividing a K space into a lot of subspaces; carrying out an under-sampling over the multiple subspaces and obtaining a K space data; reconstructing the K space data and obtaining a reconstructed image. The plane echo imaging method divides the K space into a lot of subspaces, and carried out the under-sampling over the multiple subspaces and obtains the K space data and finally reconstructs the K space data to obtain the reconstructed image. Due to the fact that compared with a full sampling, the sampling numbers are dramatically decreased, on the basis of guaranteeing the rapid imaging, the gradient switching rate and climbing gradient are reduced, and the vortex is prevented from influencing the image imaging quality by the distortion and other artifact influences. The plane echo imaging method and the system can reduce the sampling points, so that the plane echo imaging can not only guarantee the improvement of the image quality, but the calculation process and the reconstruction process are simple, convenient and feasible. The invention further provides the imaging system.

Description

【Technical field】 [0001] The invention relates to the field of magnetic resonance imaging, in particular to a planar echo imaging method and system. 【Background technique】 [0002] In 1977, Mansfield (Mansfield) first proposed the echo planar imaging EPI (echo planarimaging) sequence. Compared with basic imaging sequences such as spin echo and gradient echo, which can only fill one or several data lines in K space with one excitation, the biggest feature of echo planar imaging sequences is that only one excitation is required to obtain Data across the entire imaging plane, reducing imaging time. The readout gradient field is composed of a series of gradient fields with continuously changing directions, and each gradient field is phase-encoded separately. Generally, it only takes 30-120ms to complete 64-128 phase encodings. [0003] The echo-planar imaging sequence is currently the fastest scanning sequence. However, echo-planar imaging has higher requirements on the gradi...

AI Technical Summary

Problems solved by technology

The rapid imaging feature of echo-planar imaging is very easy to cause eddy currents, which makes the image quality affected by artifacts such as distortion, resulting in lower image quality and limiting its clinical application. Therefore, it is important to improve the imaging quality of echo-planar imaging sequences. Significance and application value

[0004] However, for the quality of echo-planar imaging, researchers have done a lot of work in terms of sequence correction, magnetic field correction, eddy current compensation, etc., but the above methods are complicated and cumbersome, which is not conducive to the promotion and application of echo-planar imaging methods

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