CN-122017705-A - Magnetic resonance imaging method, system, intelligent terminal and storage medium

CN122017705ACN 122017705 ACN122017705 ACN 122017705ACN-122017705-A

Abstract

The application relates to a magnetic resonance imaging method, a system, an intelligent terminal and a storage medium, and relates to the technical field of magnetic resonance imaging, wherein the method comprises the steps of collecting a first echo signal in a first time period after radio frequency pulse is applied to obtain reference data, wherein the first echo signal adopts a non-phase encoding gradient; acquiring a second echo signal in a second time period to obtain imaging data, wherein the second echo signal adopts a phase encoding gradient, obtaining a phase compensation amount according to the reference data, carrying out phase compensation on the imaging data according to the phase compensation amount to obtain compensated imaging data, and carrying out image reconstruction on the compensated imaging data to obtain a magnetic resonance image. The application has the effect of eliminating artifacts in the magnetic resonance image.

Inventors

QIAO PENG
XU JINRUI
ZHU JIANFENG
GE YUWEI
ZHANG JICHANG
ZHANG YUNYAN
HAN JIANJIAN

Assignees

鑫高益医疗设备股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260126

Claims (10)

1. A method of magnetic resonance imaging comprising: after the radio frequency pulse is applied, a first echo signal in a first time period is acquired to obtain reference data, wherein the first echo signal adopts a non-phase encoding gradient; acquiring a second echo signal in a second time period to obtain imaging data, wherein the second echo signal adopts a phase encoding gradient; According to the reference data, obtaining a phase compensation quantity; Performing phase compensation on the imaging data according to the phase compensation quantity to obtain compensated imaging data; And carrying out image reconstruction on the compensated imaging data to obtain a magnetic resonance image.
2. The method of claim 1, wherein deriving the phase compensation amount from the reference data comprises: Acquiring an acquisition channel of a hardware coil; Grouping the reference data according to the acquisition channels to obtain channel phase data sets, wherein the total number of the channel phase data sets is consistent with the number of the acquisition channels; Acquiring a base point phase of the channel phase data set; generating a phase matrix based on the channel phase data set; Performing compensation processing on the phase matrix to obtain a compensation phase matrix; and obtaining the phase compensation quantity according to the compensation phase matrix and the base point phase.
3. The method of claim 2, wherein said compensating the phase matrix to obtain a compensated phase matrix comprises: calculating the average value of the channel phase data set to obtain a phase average value; Calculating the difference value between the phase matrix and the phase average value to obtain a difference value phase matrix; performing low-pass filtering treatment on the difference phase matrix to obtain a filtered phase matrix; and calculating the sum of the filtering phase matrix and the phase average value to obtain the compensation phase matrix.
4. The method of claim 1, wherein the period of the low pass filtering is a period of a radio frequency pulse, and the cut-off frequency is 1Hz to 2Hz.
5. The method of magnetic resonance imaging according to claim 2, wherein said deriving the phase compensation amount from the compensation phase matrix and the base point phase comprises: Calculating the ratio of the time length of the first time period to the time length of the second time period to obtain a proportionality coefficient; calculating the difference value between the compensation phase matrix and the base point phase to obtain a difference value phase matrix; And calculating a difference phase matrix divided by the value of the proportionality coefficient to obtain the phase compensation quantity.
6. The method of magnetic resonance imaging according to claim 2, wherein the acquiring the base point phases of the channel phase data set comprises: Determining a center layer of the channel phase data set; selecting the highest value of the reference echo amplitude of the central layer, wherein the number of the highest value of the reference echo amplitude is consistent with the number of phase codes; And carrying out unwrapping treatment on the highest value of the reference echo amplitude value to obtain the base point phase.
7. The method of claim 1, wherein phase compensating the imaging data according to the phase compensation amount to obtain compensated imaging data, comprising: Expanding the number of the phase compensation amounts to the number of sampling points of the imaging data to form a phase compensation set; And performing dot multiplication processing on the imaging data and the phase compensation quantity in the phase compensation set to obtain the compensated imaging data.
8. A magnetic resonance imaging system for performing the magnetic resonance imaging method as claimed in any one of claims 1 to 7, comprising: The acquisition module is used for acquiring the first echo signal and the second echo signal; A memory for storing a program of the magnetic resonance imaging method; a processor, a program in the memory being capable of being loaded by the processor for execution and for carrying out the magnetic resonance imaging method.
9. An intelligent terminal comprising a memory and a processor, wherein the memory has stored thereon a computer program that can be loaded by the processor and that performs the method according to any of claims 1 to 7.
10. A computer readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which performs the method according to any of claims 1 to 7.

Description

Magnetic resonance imaging method, system, intelligent terminal and storage medium Technical Field The present application relates to the field of magnetic resonance imaging technology, and in particular, to a magnetic resonance imaging method, a magnetic resonance imaging system, an intelligent terminal, and a storage medium. Background In the field of medical imaging, magnetic resonance imaging technology is continually evolving and making significant progress. Magnetic resonance imaging is an important medical examination means, provides detailed internal structure information of human body for doctors, and is helpful for diagnosis and treatment of diseases. Along with the progress of science and technology, the magnetic resonance imaging technology has improved resolution, imaging speed and other aspects to a certain extent, so that the magnetic resonance imaging technology has higher and higher value in clinical application, can help doctors to judge the illness state more accurately, and makes a more appropriate treatment scheme. The related technology is that a human body is placed in a strong magnetic field, hydrogen atomic nuclei (such as hydrogen in water molecules) in the human body are excited by utilizing radio frequency pulses to generate resonance and emit signals, then signals at different positions are positioned by a system through a space coding technology (gradient magnetic field) and are collected by a receiving coil, and finally, the collected signals are processed and reconstructed by a computer to generate a magnetic resonance image reflecting the internal tissue structure and functions of the human body. For the related art, the spatial position of the magnet center of the strong magnetic field can generate periodic variation, so that the acquired data has periodic amplitude and phase variation, and artifacts exist in the generated magnetic resonance image. Disclosure of Invention In order to eliminate artifacts in magnetic resonance images, the application provides a magnetic resonance imaging method, a magnetic resonance imaging system, an intelligent terminal and a storage medium. In a first aspect, the present application provides a magnetic resonance imaging method, which adopts the following technical scheme: a magnetic resonance imaging method, comprising: after the radio frequency pulse is applied, a first echo signal in a first time period is acquired to obtain reference data, wherein the first echo signal adopts a non-phase encoding gradient; acquiring a second echo signal in a second time period to obtain imaging data, wherein the second echo signal adopts a phase encoding gradient; According to the reference data, obtaining a phase compensation quantity; Performing phase compensation on the imaging data according to the phase compensation quantity to obtain compensated imaging data; And carrying out image reconstruction on the compensated imaging data to obtain a magnetic resonance image. By adopting the technical scheme, the stable phase error caused by system hardware can be directly and exclusively captured and separated by collecting the first echo signal without the phase encoding gradient as reference data. And then, the imaging data is corrected by using the phase compensation quantity obtained by the reference data, so that the artifacts caused by systematic errors can be precisely eliminated, and the definition and the diagnosis accuracy of the image are obviously improved. Optionally, acquiring an acquisition channel of the hardware coil; Grouping the reference data according to the acquisition channels to obtain channel phase data sets, wherein the total number of the channel phase data sets is consistent with the number of the acquisition channels; Acquiring a base point phase of the channel phase data set; generating a phase matrix based on the channel phase data set; Performing compensation processing on the phase matrix to obtain a compensation phase matrix; and obtaining the phase compensation quantity according to the compensation phase matrix and the base point phase. By adopting the technical scheme, the reference data are grouped according to the hardware acquisition channels, so that the unique phase errors of each independent channel can be finely identified and separated, and the mutual confusion of the errors among the channels is avoided. The phase compensation amount generated based on the method has channel pertinence, so that artifacts caused by channel inconsistency can be effectively corrected, the image uniformity is improved, and the overall quality of multi-channel imaging is improved. Optionally, calculating the average value of the channel phase data set to obtain a phase average value; Calculating the difference value between the phase matrix and the phase average value to obtain a difference value phase matrix; performing low-pass filtering treatment on the difference phase matrix to obtain a filtered phase matrix; and calculating the