Frequency-domain-based method for lipid and water suppression treatment of magnetic resonance spectrum imaging data

A frequency domain, water treatment technology, applied in the field of medical imaging, can solve the problems of shortening the overall processing time, incomplete water and fat suppression in the acquisition sequence, etc.

Inactive Publication Date: 2017-09-01
杭州全景医学影像诊断有限公司
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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for processing MRSI data based on frequency-domain fat suppression and water suppression, to solve the problem of incomplete water suppression and fat suppression in the collection sequence, and to combine the fat suppression and water suppression process into the process of quantitatively processing MRSI data, Meet the needs of quantification and fat and water suppression at the same time, which can shorten the overall processing time

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  • Frequency-domain-based method for lipid and water suppression treatment of magnetic resonance spectrum imaging data
  • Frequency-domain-based method for lipid and water suppression treatment of magnetic resonance spectrum imaging data
  • Frequency-domain-based method for lipid and water suppression treatment of magnetic resonance spectrum imaging data

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[0022] Such as figure 1 As shown, the present invention provides a method for suppressing fat and water based on frequency-selected magnetic resonance spectrum data, comprising the steps of:

[0023] 1. Convert the collected single-pixel MRSI time-domain data to the frequency-domain FID signal by one-dimensional Fourier transform, and obtain the frequency-domain data Y k .

[0024] 2. Divide and select the frequency range of lipid and the frequency range of water signal.

[0025] In the field of magnetic resonance spectroscopy imaging, metabolites are distinguished by using different chemical shifts of each metabolite. Chemical shifts are represented by a map, with each line or set of lines corresponding to a specific metabolite. In order to make the displayed chemical shift independent of the field strength, usually, the relative value δ in parts per million (ppm) is used to express the chemical shift:

[0026]

[0027] Among them, f ref is the resonance frequency of ...

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Abstract

The invention belonging to the field of medical imaging provides a frequency-domain-based method for lipid and water suppression treatment of magnetic resonance spectrum imaging data. The method comprises: one-dimensional Fourier transform is carried out on collected single voxel magnetic resonance spectrum time-domain data to obtain a frequency-domain FID signal; according to prior knowledge, four lipid peaks and one water signal frequency range are determined; a nonlinear parameter attenuation coefficient in a spectrum time-domain model by using a singular value decomposition method; on the basis of a spectrum peak frequency in the prior knowledge and the attenuation coefficient obtained by quantification, the amplitude and phase of a linear parameter are estimated by using an amplitude-phase adaptive FIR filtering method; the frequency range is changed and the previous two steps are executed circularly until quantification of the four group of lipid and water signal parameters is completed; the time-domain FID model and the lipid and water signal quantification parameters form lipid and water time-domain signals; and one-dimensional Fourier transform is carried out on the time-domain signals, difference processing is carried out on the frequency domain and an original spectral signal, thereby obtaining magnetic resonance spectrum imaging data after lipid and water suppression treatment.

Description

technical field [0001] The invention relates to the field of medical imaging. Background technique [0002] Nowadays, the water suppression sequence and lipid suppression sequence are widely used to suppress the MRSI data acquisition stage, but this method is not completely suppressed, and there will be residual components, which makes the trace metabolites be submerged in the water signal and lipid signal. With the development of medical research, it is already possible to diagnose diseases and grade tumors through information such as the ratio of metabolite content, but the fat and water suppression through pretreatment in the research can no longer meet the demand. Contents of the invention [0003] The main purpose of the present invention is to provide a method for processing MRSI data based on frequency-domain fat suppression and water suppression, to solve the problem of incomplete water suppression and fat suppression in the collection sequence, and to combine the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54
CPCG01R33/54
Inventor 陈晨李成州许远帆王石峰
Owner 杭州全景医学影像诊断有限公司
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