3 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.

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.