University of Minnesota

Champaign Imaging LLC

Curtis A Corum

Michael G Garwood

Steen Moeller

Djaudat S Idiyatullin

Ryan Chamberlain

Angela Lynn Styczynski Snyder

Carl J Snyder

A system includes a machine readable storage medium storing instructions and a processor to execute the instructions. The processor executes the instructions to receive magnetic resonance imaging (MRI) data of a patient obtained via a free induction decay (FID) sequence, each FID of the FID sequence indicating missing or corrupted points at the beginning of the FID. The processor executes the instructions to replace the missing or corrupted points of each FID with estimated points to generate a corrected FID sequence. The processor executes the instructions to estimate a phase that minimizes an imaginary DC value of each corresponding FID.

Robust and computationally efficient missing point and phase estimation for FID sequences

A system includes a machine readable storage medium storing instructions and a processor to execute the instructions. The processor executes the instructions to receive radial k-space magnetic resonance imaging (MRI) data of a patient and determine a series of dipole sources via direct dipole decomposition of the radial k-space MRI data. The processor executes the instructions to identify an activation within the patient based on the series of dipole sources.

Functional magnetic resonance imaging with direct dipole decomposition

A method for generating a magnetic resonance image includes applying a radio frequency (RF) pulse to a specimen. The method includes modulating a spatially varying magnetic field to impart an angular velocity to a trajectory of a region of resonance relative to the specimen. The method includes acquiring data corresponding to the region of resonance and reconstructing a representation of the specimen based on the data.

Steering resonance along a trajectory

A system includes a data receiver, a sinogram generator, a processor, a filter module, and an output module. The data receiver is configured to receive radial ordered magnetic resonance data. The sinogram generator is configured to generate a first sinogram corresponding to a view angle as a function of a readout direction for the magnetic resonance data. The processor is configured to generate an oscillogram having an angular frequency axis. The oscillogram corresponds to a Fourier transform of the first sinogram. The filter module is configured to selectively filter a peak in a projection formed along a selected axis of the oscillogram, the peak being related to an interference signal such as an RF interference. The selected axis is orthogonal to the angular frequency axis. The output module is configured to form a second sinogram corresponding to a transform of the filtered projection.

Method of oscillogram filtering for radial MRI data

A method includes applying a pulse train to a spin system in a scanner. The pulse train has a plurality of discontinuities in a time domain. The method includes receiving a response from the spin system. The response corresponds to a gated signal. The method includes accessing a correction factor corresponding to the scanner. The method includes calculating a correction to the response based on the correction factor. The method includes generating an output based on the correction.

Sideband processing for magnetic resonance

Positive contrast localization of magnetic (e.g. superparamagnetic) particles in vivo or in vitro by means of SWIFT-MRI using the imaginary component of MR image data in combination with an anatomic reference image derived from the real or magnitude component.

Localization of magnetic particles by means of swift-MRI

A magnetic resonance image is produced by shifting a gap during acquisition of spin data for a specimen. The spin data is generated by a gapped excitation sequence.

Pulse gap cycling for improved swift

A method includes receiving k-space data corresponding to magnetic resonance data for a subject and selecting a template for analysis. In addition, the method includes generating an image using the k-space data and using the template.

Dipole matched filter for MRI

This document discloses, among other things, a method for removing a bullseye artifact from a radial image generated using magnetic resonance and using a swept frequency pulse.

Multistep correction for angle consistent artifacts in radial sampled datasets

A magnetic resonance image is produced by radial imaging using one or more preparatory pulses. The magnetic preparation pulse can include one or more adiabatic pulses.

Adiabatic magnetization preparation for B1 and B0 insensitive high contrast MRI

RF pulse distortion correction

A method of magnetic resonance is provided that uses a frequency swept excitation wherein the acquired signal is a time domain signal is provided. In one embodiment, the method comprises, applying a sweeping frequency excitation and acquiring a time domain signal. The sweeping frequency excitation has a duration and is configured to sequentially excite isochromats having different resonant frequencies. Acquisition of the time domain signal is done during the duration of the sweeping frequency excitation. The time domain signal is based on evolution of the isochromats.

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Shoreview, MN, United States of America

Curtis A Corum