University of Minnesota

Duke University

Edward Auerbach

Kamil Ugurbil

Steen Moeller

Guillermo Sapiro

Pierre-Francois Van De Moortele

Xiaoping Wu

Essa Yacoub

Noam Harel

Sebastian Schmitter

Remi Patriat

Henry Braun

Tara Palnitkar

Oren Solomon

A system and method are provided for creating magnetic resonance (MR) images with reduced motion artifacts from the MR data from which the images are produced. The method includes selecting a candidate image from a plurality of candidate images reconstructed from the MR data. The method also includes registering the candidate image to a reference image, comparing the candidate image to a consistency map, and, based on comparing the candidate image using the consistency map, selecting a blending algorithm. The method also includes generating a blended image using the blending algorithm and the candidate image and repeating these steps for each candidate image. The method also includes performing a Fourier aggregation to generate a combined image and displaying the combined image with reduced motion artifacts compared to the plurality of candidate images.

System and method for control of motion in medical images using aggregation

A method for designing one or more multichannel, multiband radio frequency ('RF') pulses for use with a magnetic resonance imaging ('MRI') system is provided. The method includes determining a number of RF amplitude modulations and a number of RF phase modulations for each channel in a multichannel RF coil by minimizing an objective function that includes a complex-valued vector. The objective function also contains a system matrix that accounts for both a spatial sensitivity profile of each channel in the multichannel RF coil and a magnetic field map for each excitation band in the multiband RF pulse.

Multiband RF/MRI pulse design for multichannel transmitter

A method for iteratively calibrating a reconstruction kernel for use in accelerated magnetic resonance imaging (MRI) is provided. An MRI system is used to acquire k-space data from multiple slice locations following the application of a multiband radio frequency (RF) excitation pulse. An initial reconstruction kernel is generated from the acquired k-space data, and this initial reconstruction kernel is used to produce an initial image for each of the multiple slice locations by applying the initial reconstruction kernel to the acquired k-space data. The average phase of each slice location is then calculated from these images, and used to shift the phase values of the subsequently acquired k-space data. From the phase-shifted k-space data, an updated reconstruction kernel is then generated. This process is repeated iteratively until a stopping criterion is satisfied.

System and method for iteratively calibrated reconstruction kernel for accelerated magnetic resonance imaging

A system and method for producing images depicting a plurality of slice locations in a subject using a magnetic resonance imaging ('MRI'} system is provided. In particular, the system and method utilize time-shifted multiband radio frequency ('RF'} pulses to lower peak voltage and peak power requirements when using conventional multiband RF pulses. A time-shifted multiband RF pulse includes at least two component RF pulses, which may be single-band or multiband pulses. The component RF pulses are designed such that they do not have temporal footprints that completely overlap; although, they may have temporal foot-prints that partially overlap or do not overlap at all. The MRI system is used to acquire magnetic resonance signals formed in response to a time-shifted multiband RF pulse and, from these acquired signals, images depicting each of the plurality of slice locations in the subject are reconstructed.

System and method for reducing radio frequency peak voltage and power requirements in magnetic resonance imaging using time-shifted multiband radio frequency pulses

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Minneapolis, MN, United States of America

Edward Auerbach