Methods, apparatus, devices, and storage media of determining radio frequency pulse correction parameters

CN115902736BActive Publication Date: 2026-07-21UNITED IMAGING RES INST OF INNOVATIVE MEDICAL EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNITED IMAGING RES INST OF INNOVATIVE MEDICAL EQUIP
Filing Date
2022-11-23
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In high-field local excitation imaging in magnetic resonance imaging, the gradient with alternating polarity of the radio frequency pulse and the layer direction leads to eddy current effects, resulting in N/2 ghosts in the image. This reduces the possibility of downsampling the local excitation image, and existing software eddy current correction methods are time-consuming.

Method used

Two rounds of radio frequency pulses are applied to the target layer, with layer selection gradients of opposite polarity. The phase data difference is read, and the correction parameters of the radio frequency pulses, including time delay and phase compensation, are obtained by fitting.

Benefits of technology

It effectively reduces eddy current correction time, improves the efficiency and accuracy of eddy current correction, and enhances the downsampling capability of local excitation images.

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Abstract

The application relates to the technical field of nuclear magnetic resonance imaging, and provides a method, a device and equipment for determining a radio frequency pulse correction parameter and a storage medium, which can reduce the time required for determining the radio frequency pulse correction parameter. In the application, two rounds of radio frequency pulses for a target layer are applied to obtain two groups of phase data of the target layer; wherein the polarity of a slice selection gradient applied together with the radio frequency pulses is opposite in the application of the two rounds of radio frequency pulses; the phase data corresponding to the same position in the target layer in the two groups of phase data is subtracted to obtain a group of phase data differences; and the group of phase data differences is fitted to obtain the correction parameter of the radio frequency pulse.
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