6 results about "Echo-planar imaging" patented technology

Disclosed in the present invention are a 3D navigator-based 3D gradient spin-echo diffusion imaging method, and a device. The method comprises: first, using a global saturation module to destroy previous residual transverse magnetization; second, by means of a diffusion encoding module, embedding a pair of trapezoidal cosine oscillation gradients or pulse gradients into radio frequency pulses of 90°x-180°y-90°-x, and separating diffusion encoding from signal acquisition; then using a fat saturation module to suppress a fat signal; using a 3D gradient spin-echo readout method to acquire an image signal; and finally, acquiring a 3D navigation echo signal in the last spin echo for correcting a phase error between multiple excitations. The present invention can effectively eliminate phase errors between multiple acquisitions and realize high-resolution whole-brain diffusion imaging. Compared with 2D echo planar imaging, the present invention increases the signal-to-noise ratio of diffusion magnetic resonance imaging, thereby supporting higher-resolution whole-brain 3D diffusion magnetic resonance imaging.

Techniques are provided for performing echo planar imaging (EPI) data correction. This includes obtaining positive and negative readout gradient calibration data of an imaging target through non-accelerated EPI acquisitions; respectively adopting first and second DPG kernels to be fitted and respectively used to eliminate phase errors of positive and negative readout gradients to fit the positive and negative readout gradient calibration data of the imaging target, with the fitting targets being positive and negative readout gradient data, respectively, in ghost-free target ACS data, and obtaining, after the fitting, a first and a second DPG kernel for final use; obtaining imaging data of the imaging target through an EPI acquisition; adopting the first and second DPG kernels to correct the phase errors of the imaging data to obtain phase-error-free imaging data.

The application relates to the technical field of nuclear magnetic resonance image reconstruction, and provides a multi-echo image reconstruction method, device and nuclear magnetic resonance imaging equipment, and the reconstruction method has high stability.In the application, based on a multi-shot echo planar imaging sequence, first multi-echo data corresponding to echo signals in a preset space are obtained; a basis part for constructing a reconstruction function is obtained according to the difference between second multi-echo data corresponding to the multi-echo image to be reconstructed in the preset space and the first multi-echo data; the basis part is added with a first constraint and a second constraint to obtain the reconstruction function; the first constraint is a constraint on a low-rank term in the multi-echo image to be reconstructed; the second constraint is a constraint on a residual term in the multi-echo image to be reconstructed; and the multi-echo image is reconstructed according to the low-rank term and the residual term for minimizing the reconstruction function.

Systems and methods are described for investigating brain-wide CSF flow dynamics and understanding the role of neural activity, including an Echo-Planar Time-resolved Imaging (EPT)I CSF flowmetry technique that can simultaneously acquire i) phase-contrast 4D CSF flow, ii) T2*-BOLD fMRI, and iii) T2- and S0-contrast changes. EPTI eliminates the distortion and blurring artifacts in Echo-Planar Imaging (EPI), as well as resolving multi-echo images within the readout, allowing for the separation of various contrasts including T2*, T2, and flow-encoded S0. This separation is particularly useful for obtaining clean BOLD-fMRI signals.

A method for correcting echo planar imaging artifacts includes correcting at least one echo planar imaging artifact in an image to obtain a correct image. A trained neural network is used to correct the at least one echo planar imaging artifact. The image is obtained through echo planar imaging.