The invention provides a composite reconstruction method for a self-adaptation quantitative magnetisability distribution diagram based on the structural feature, and relates to quantitative magnetisability imaging. According to the priori magnetisability distribution diagram base reconstruction based on the amplitude image structural feature, a reconstruction model comprises a fidelity item with a compression perception characteristic and an amplitude priori regularization bound item with a sparse feature, a region of interest is added to extract a binary weighting matrix from an amplitude image, and binary weighting is conducted on original magnetisability distribution; according to magnetisability distribution diagram composite reconstruction based on the magnetisability distribution structural feature, the reconstruction model comprises a least square fidelity item, a structural feature regularization bound item, acquired by base reconstruction, of a magnetisability distribution diagram structure, and a smooth item used for improving a reconstruction magnetisability distribution effect, the magnetisability structural feature is defined as the ladder degree information of 3D image data in three directions in a priori mode; for a l1 norm optimization problem, an iterative threshold value method is used for processing; then, based on the convex function character of a l2 norm, a conjugate gradient method is used for solving.

Composite reconstruction method for self-adaptation quantitative magnetisability distribution diagram based on structural feature

A system and method for magnetic resonance imaging is provided The method includes acquiring a plurality of echo signals relating to a region of interest of a subject at a number of echo times; generating a plurality of phase images based on the plurality of echo signals; generating an unwrapped phase map by performing a phase unwrapping correction to the plurality of phase images; generating a virtual phase map based on the unwrapped phase map; determining a phase mask based on the virtual phase map; obtaining magnitude information of the plurality of echo signals; and generating a susceptibility weighted image based on the phase mask and the magnitude information

System and method for magnetic resonance imaging

The invention discloses a magnetic resonance quantitative magnetic susceptibility imaging multi-echo phase fitting method, which comprises the steps of obtaining magnetic resonance original data through multi-echo gradient echo sequence acquisition; obtaining noise intensity level by calculating tested first echo pattern noise; arranging a threshold for cross cutting a signal according to a pattern noise level; selectively cross cutting the magnetic resonance multi-echo signal, cross cutting echo whose signal amplitude is lower than the threshold, and only allowing echo whose signal amplitude is higher than or equal to the threshold participate phase fitting; obtaining a magnetic field distribution map by performing phase fitting to echo that satisfies the threshold by employing weight least spuares; and performing subsequent processing like time-domain unwinding and background field removing to the magnetic field distribution map. In this way, a magnetic susceptibility distribution map is retrieved from the field to the source. The magnetic resonance quantitative magnetic susceptibility imaging multi-echo phase fitting method has the advantages like rapid and accurate.

Magnetic resonance quantitative magnetic susceptibility imaging multi-echo phase fitting method

The invention discloses a magnetic resonance flip angle calculating method and system and a computer readable storage medium. The method comprises the steps that the initial flip angle configuration of a refocusing radio-frequency pulse is obtained; whether the initial flip angle configuration meets a first criterion or not is judged; based on a first judgment result, and the first flip angle configuration is determined, wherein the first flip angle configuration meets the first criterion; whether the first flip angle configuration meets a second criterion or not, wherein the second criterionis associated with a second parameter of an echo train length corresponding to the first flip angle configuration; based on a second judgment result, the second flip configuration is determined, wherein the second flip configuration meets a second criterion; based on the second flip angle configuration, a nuclear magnetic resonance signal is obtained. By means of the magnetic resonance flip anglecalculating method and system, the specific absorption rate of the refocusing radio-frequency pulse can be reduced, and meanwhile, the signal-to-noise ratio and the contrast ratio of an MR image keepunchanged.

Magnetic resonance flip angle calculating method and system and computer readable storage medium

A magnetic resonance imaging (MRI) apparatus for obtaining a magnetic resonance (MR) image using a multi-echo pulse sequence including a plurality of repetition times, including a memory configured to store an MR signal obtained using the multi-echo pulse sequence, and an image processor configured to determine a plurality of echo times included in the plurality of repetition times to provide the multi-echo pulse sequence including the plurality of echo times during the plurality of repetition times, and to obtain the MR image, based on the MR signal, wherein the plurality of repetition times includes a first repetition time adjacent to a second repetition time, wherein the plurality of echo times includes a first echo time of the first repetition time, a second echo time of the first repetition time, a first echo time of the second repetition time, and a second echo time of the second repetition time.

Magnetic resonance imaging apparatus and method for obtaining magnetic resonance image

An MRI system acquires a susceptibility-weighted image by acquiring a first RF echo signal in a first echo time for providing an image exclusive of susceptibility-weighting and acquiring a second RF echo signal in a second echo time longer than the first echo time for providing an image including susceptibility-weighting. A compensation gradient field is applied for compensating for field inhomogeneity and in response, a third RF echo signal is acquired in a third echo time longer than the second echo time. First, second and third images are generated in response to data derived from the first, second and third RF echo signals respectively and data of the first, second and third images is combined to provide image data representing an image compensating for magnetic resonance signal attenuation in the second image.

Magnetic resonance imaging apparatus and susceptibility-weighted imaging method using the same

The invention provides a magnetic resonance imaging device and a susceptibility-weighted magnetic resonance imaging method using the same. An MRI system acquires a susceptibility-weighted image by acquiring a first RF echo signal in a first echo time for providing an image exclusive of susceptibility-weighting and acquiring a second RF echo signal in a second echo time longer than the first echo time for providing an image including susceptibility-weighting. A compensation gradient field is applied for compensating for field inhomogeneity and in response, and a third RF echo signal is acquired in a third echo time longer than the second echo time. First, second and third images are generated in response to data derived from the first, second and third RF echo signals respectively and data of the first, second and third images is combined to provide image data representing an image compensating for magnetic resonance signal attenuation in the second image.

Magnetic resonance imaging device and susceptibility-weighted magnetic resonance imaging method using same

Susceptibility-weighted magnetic resonance imaging

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Magnetic resonance imaging apparatus and susceptibility-weighted imaging method using the same

Magnetic resonance imaging device and susceptibility-weighted magnetic resonance imaging method using same

Susceptibility-weighted magnetic resonance imaging