43 results about "Multiparametric Magnetic Resonance Imaging" patented technology

The method includes positioning a patient within a receiving space of a stand-up MRI apparatus and imaging the region of interest of the patient while the patient moves the region of interest. Further in accordance with the method the patient may be positioned such that the patient faces a pole face of a magnet of the MRI apparatus. The apparatus comprises a patient support which allows imaging of a patient's spine with a gravitational load on the spinal system.

A system and method for providing a dark-blood technique for contrast-enhanced cardiac magnetic resonance, improving visualization of subendocardial infarcts or perfusion abnormalities that may otherwise be difficult to distinguish from the bright blood pool. In one technique the dark-blood preparation is performed using a driven-equilibrium fourier transform (DEFT) preparation with motion sensitizing gradients which attenuate the signal in the ventricular cavities related to incoherent phase losses resulting from non-steady flow within the heart. This dark-blood preparation preserves the underlying contrast characteristics of the pulse sequence causing a myocardial infarction to be bright while rendering the blood pool dark. When applied to perfusion imaging, this dark-blood preparation will help eliminate artifacts resulting from the juxtaposition of a bright ventricular cavity and relatively dark myocardium.

In a method and magnetic resonance apparatus for segmenting image data of an examination object, raw data of the examination object are achieved with the operation of a magnetic resonance scanner. Quantitative image data of the examination object are then calculated in a processor from the raw data. At least one physical variable of the examination object is quantitatively ascertained pixelwise and is displayed. The quantitative image data are segmented for identification of predetermined objects in the quantitative image data, and displayed in a display unit.

An MRI method includes: performing a first data acquisition block of a pulse sequence to acquire a first MR data from a plurality of slices of a subject during a period of fully recovered longitudinal magnetization within the plurality of slices disposed at different locations in the subject; performing a second data acquisition block of the pulse sequence including a magnetization preparation module followed by a recovery period and an imaging sequence executed during the recovery period, to acquire a second MR data from the plurality of slices during the recovery period; and generating a T1 map of the subject based on the first MR data and the second MR data, of the plurality of slices.

The present invention discloses a design method of a biplane magnetic resonance imaging system gradient coil. The method comprises the steps of: performing three-dimensional continuous triangular meshdivision for a gradient coil area, according to a boundary element method, calculating a coil inductance matrix generated by the gradient coil area mesh node for a target field point, calculating thecurrent and the direction of the gradient coil plane through a coil target gradient value, an inductance constraint condition and a Tikhonov Regularization, and finally employing a stream function method to obtain actual winding distribution of the gradient coil. The design method of a biplane magnetic resonance imaging system gradient coil solves the problem that the coil inductance is large inthe gradient coil.

The invention discloses a system for transcranial magnetic stimulation. The system comprises a stimulation unit, a magnetic resonance unit and a synchronization unit, wherein the synchronization unitis used for controlling the synchronization of the stimulation unit and magnetic resonance unit. The system can carry out real-time and accurate evaluation on the therapeutic effect of a TMS and can acquire magnetic resonance imaging signals of a preset area of a target in real time while carrying out transcranial magnetic stimulation on the target; real-time magnetic resonance imaging is carriedout according to the magnetic resonance imaging signals. According to a real-time magnetic resonance imaging result, current waveform parameters of a stimulated area of the target or a coil of the stimulation unit are continuously adjusted until an expected magnetic resonance imaging result of the preset area is obtained.

The invention discloses a method and system for dynamic magnetic resonance imaging. A norm sparsity constraint is carried out on a spatial basis on the basis of a conventional PS (Partial Separability) method, so that image artifact and reconstruction noise are more effectively reduced, the image quality is greatly improved, and the reconstruction of a high temporal-spatial resolution dynamic magnetic resonance image is effectively realized. The method comprises the following steps: acquiring K-t spatial navigation data and dynamic image data, which are collected in a sampling mode based on a partial separability method; constructing a dynamic imaging reconstruction model containing a spatial basis function and a temporal basis function based on the partial separability method; acquiring the temporal basis function according to the navigation data; based on the dynamic imaging reconstruction model, estimating the spatial basis function by a least square method according to the temporal basis function and the dynamic image data; utilizing the temporal basis function and the dynamic image data to carry out interpolation recovery on the k spatial dynamic image data, and then carrying out Fourier transformation so as to acquire a reconstructed dynamic magnetic resonance image.

The invention provides a real-time magnetic resonance imaging data collecting and analyzing method and system. The method comprises the steps that scanning is conducted on a testee, and a magnetic resonance scan image sequence is generated in real time; real-time processing is conducted on the magnetic resonance scan image sequence to obtain scan image data subjected to real-time treatment. The system comprises a magnetic resonance scanning module and a data processing module. According to the real-time magnetic resonance imaging data collecting and analyzing method and system, the magnetic resonance scan image sequence is generated through the magnetic resonance scanning module in real time, the magnetic resonance scan image sequence is transmitted to the data processing module in time so as to enable the data processing module to conduct image processing, and therefore real-time collecting and analyzing of magnetic resonance imaging data are achieved. The real-time magnetic resonance imaging data collecting and analyzing system is stable in framework performance, safe, reliable and strong in expandability. In brain science research, compared with offline function magnetic resonance imaging, the real-time function magnetic resonance imaging is more accurate in feedback regulation mode and better in real-time performance.

A method for proton resonance frequency shift (PRF) and T₁-based temperature mapping using a magnetic resonance imaging (MRI) system includes acquiring, using the MRI system, a set of magnetic resonance (MR) data from a region of interest of a subject by performing a variable-flip-angle multi-echo gradient-echo 3D stack-of-radial pulse sequence. The pulse sequence is configured to acquire radial k-space data in a plurality of segments, each segment acquired with each of a plurality of flip angles. The method further includes generating at least one T₁ map based on the set of MR data, generating at least one PRF temperature map based on the set of MR data, generating at least one T₁-based temperature map based on the set of MR data and displaying the PRF temperature map and the T₁-based temperature map. In another embodiment, the MR data may be used to generate a plurality of quantitative parameter maps for each of the plurality of MR parameters such as T₁, proton-density fat fraction (PDFF), and R₂*.