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Method for performing parallel magnetic resonance imaging

A technology of magnetic resonance imaging and magnetic resonance imaging, which is applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., and can solve the problems of high reduction factor being infeasible and so on.

Inactive Publication Date: 2013-12-11
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Problems solved by technology

However, despite the use of regularization, high reduction factors (values ​​beyond R=2) are generally considered to be poor when using low magnetic field strengths (up to 1.5 Tesla), since the reconstructed image suffers from severe aliasing artifacts. not possible

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  • Method for performing parallel magnetic resonance imaging
  • Method for performing parallel magnetic resonance imaging
  • Method for performing parallel magnetic resonance imaging

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Embodiment Construction

[0058] Before describing the present invention in detail, some basic facts about pMRI, especially SENSE, need to be reviewed.

[0059] MRI is an imaging technique that can be performed in 2D (two-dimensional) or directly in 3D (three-dimensional) depending on the associated RF pulse design. In the 2D case, adjacent slices are used to cover the volume. Since this method enables faster k-space scanning, PMRI can be used in both cases regardless of its resolution (ie in 2D or 3D). For brevity, only the 2D case is shown in the following.

[0060] A bank of C-coils is used to measure the spin density p into the object under study, eg the brain in the patient's head. Image acquisition is based on a specific imaging sequence; in an exemplary embodiment of the invention, anatomical MRI is based on a 3DMPRAGE sequence, whereas the involved functional MRI is performed using 2D echo planar imaging (EPI). The following description will focus on the 2D case; then, the signal d received ...

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Abstract

A method of parallel magnetic resonance imaging of a body, comprising: - acquiring a set of elementary magnetic resonance images of said body from respective receiving antennas having known or estimated sensibility maps and noise covariance matrices, said elementary images being under-sampled in k-space; and performing regularized reconstruction of a magnetic resonance image of said body; wherein said step of performing regularized reconstruction of a magnetic resonance image is unsupervised and carried out in a discrete frame space. A method of performing dynamical and parallel magnetic resonance imaging of a body, comprising: acquiring a set of time series of elementary magnetic resonance images of said body from respective receiving antennas having known or estimated sensibility maps and noise covariance matrices, said elementary images being under-sampled in k-space; and performing regularized reconstruction of a time series of magnetic resonance images of said body.

Description

technical field [0001] The present invention relates to a method for performing parallel magnetic resonance imaging (pMRI) of the human body, including parallel, dynamic (time-resolved) magnetic resonance imaging, such as functional magnetic resonance imaging (fMRI). Background technique [0002] In medical magnetic resonance imaging (MRI), especially when it comes to dynamic imaging like fMRI, the main concern is to reduce the overall acquisition time. Indeed, short acquisition times allow for improved spatial / temporal resolution of the acquired fMRI data, which leads to more efficient statistical analyses. Furthermore, by reducing the overall imaging time, some additional artifacts caused by patient movement can be avoided. For this reason, parallel imaging systems have been developed: using multiple receiver surface coils with complementary sensitive profiles placed around an underlying object or body to simultaneously acquire the following images in the frequency domain...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/561G01R33/563
CPCG01R33/5611G01R33/5616G01R33/56308G01R33/561
Inventor 卢菲特·查理塞巴斯蒂安·梅里奥菲利普·丘丘让-克里斯托夫·佩斯凯
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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