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Method for correcting planar echo two-dimensional spatial selective pulses

A two-dimensional space, planar echo technology, applied in the direction of magnetic resonance measurement, etc., can solve the problem that the K-space trajectory cannot be guaranteed, and achieve the effect of improving the two-dimensional excitation profile, improving image quality, and improving performance

Active Publication Date: 2020-05-12
ALLTECH MEDICAL SYST
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Problems solved by technology

The existing technology can greatly improve the accuracy of the gradient output waveform by means of eddy current compensation, shimming technology, gradient system PID correction, gradient delay correction, and gradient nonlinear correction, but it still cannot guarantee accurate excitation K-space trajectory

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  • Method for correcting planar echo two-dimensional spatial selective pulses
  • Method for correcting planar echo two-dimensional spatial selective pulses
  • Method for correcting planar echo two-dimensional spatial selective pulses

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Embodiment Construction

[0027] 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.

[0028] The correction method of the planar echo two-dimensional space selective pulse disclosed by the present invention is as follows:

[0029] Such as figure 2 As shown, the excitation pulse K-space trajectory compensation method is to increase the delay compensation amount Gdelay2DRF between the gradient channel and the RF channel of the excitation pulse, and move the excitation K-space trajectory so that the excitation K-space centers of the odd and even rows are aligned, so that Greatly improve the performance of the excitation pulse; Gdelay2DRF is the compensation amount based on the system having performed gradient delay correction, eddy current compensation, shimming correction, etc., and its value can be positive or negative, which is obtained by measuri...

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Abstract

The invention discloses a method for correcting planar echo two-dimensional spatial selective pulses. The method comprises the steps of: increasing a delay compensation amount between a gradient channel and a radio frequency channel of a two-dimensional spatial selective excitation pulse, and moving the position of excitation K space, so as to enable the centers of the excitation K spaces in odd and even rows to be aligned. For the two-dimensional spatial selective pulse adopting the planar echo to excite the K space track, the method can ensure that the centers of the K spaces excited by theodd and even sub SINC waveforms are aligned, and can greatly improve the two-dimensional excitation contour, thereby improving the image quality of small-view imaging.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance, in particular to a method for correcting planar echo two-dimensional space selective pulses. Background technique [0002] In recent years, small-field imaging technology has gradually been applied to a variety of advanced clinical applications of magnetic resonance. For example, the small-field three-dimensional fast spin echo sequence can reduce the scanning time; in the small-field diffusion-weighted imaging, the resolution can be improved, and image distortion and artifacts can be reduced. [0003] Small field-of-view imaging techniques rely on two-dimensional spatially selective excitation pulses. The design of two-dimensional spatially selective excitation pulse mainly includes the design of excitation K-space trajectory and window function design, the most typical ones are echo-planar excitation trajectory and rectangular window function (corresponding to the SINC envelope in e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/32
CPCG01R33/32
Inventor 罗海朱高杰王文周陈梅泞王园园王世杰蒋辉刘霞
Owner ALLTECH MEDICAL SYST
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