Magnetic resonance imaging using randomized radio frequency pulses
AssigneeThe Regents of the University of California
InventorEric C. Wong
Life of this patent
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Abstract
Methods, systems and apparatus for magnetic resonance imaging that facilitate applying a gradient waveform to generate a k-space trajectory in a subject, applying radio frequency (RF) pulses having a pseudorandom phase distribution, such that the RF pulses are applied to the subject at a plurality of non-uniform locations near a center of the k-space trajectory and collecting, based on the applied RF pulses and the applied gradient waveform, imaging data from the subject.
Claims20
A method of magnetic resonance imaging (MRI), the method comprising:
- applying, by a coil, a gradient waveform in order to generate a k-space trajectory in a subject;
- applying, by a pulse generator, radio frequency (RF) pulses having a pseudorandom phase distribution, such that the RF pulses are applied to the subject at a plurality of non-uniform locations near a center of the k-space trajectory, wherein the RF pulses are applied using a flip angle that is 2 degrees or less in order to determine a weighting of echo pathways;
- and
- collecting, imaging data from the subject that is sampled by a processor, based on the applied RF pulses and the applied gradient waveform, imaging data from the subject;
- wherein none of the sampled imaging data that is collected by the processor occurs at the center or origin of K-space even when a K-space trajectory passes through the center or origin of K-space;
- and
- generating an MRI image that is stored in a memory.
An apparatus configured for magnetic resonance imaging (MRI), comprising:
- a first coil that applies a gradient waveform in order to generate a k-space trajectory in a subject;
- a radio frequency (RF) pulse generator that generates RF pulses having a pseudorandom phase distribution;
- a second coil that applies the RF pulses such that the RF pulses are applied to the subject at a plurality of non-uniform locations near a center of the k-space trajectory and using a flip angle that is 2 degrees or less in order to determine a weighting of echo pathways;
- and
- a collector that collects, imaging data from the subject that is sampled based on the applied RF pulses and the applied gradient waveform, imaging data from the subject;
- wherein none of the sampled imaging data that is collected by the processor occurs at the center or origin of K-space even when a K-space trajectory passes through the center or origin of K-space;
- and generating an MRI image that is stored in a memory.
A magnetic resonance imaging (MRI) system, comprising:
- a data acquisition subsystem that acquires randomly encoded MRI data from a subject;
- and
- a compressed sensing subsystem that performs compressed sensing reconstruction on the randomly encoded MRI data in order to reconstruct an image of the subject,
- wherein the data acquisition subsystem includes a magnetization subsystem that is operable in order to apply, to the subject, gradient pulses in order to generate a k-space trajectory and radio frequency (RF) pulses at non-uniform locations near a center of the k-space trajectory, the RF pulses having pseudorandom phases such that the randomly encoded MRI data is amenable to a reconstruction by the compressed sensing subsystem,
- wherein the magnetization subsystem is also operable in order to apply the RF pulses using a flip angle that is 2 degrees or less in order to determine a weighting of echo pathways;
- and
- a collector that collects, the randomly encoded MRI data from the subject;
- wherein none of the randomly encoded MRI data that is collected by the collector occurs at the center or origin of K-space even when a K-space trajectory passes through the center or origin of K-space;
- and
- generating an MRI image that is stored in a memory.
Dependencies are inferred from the claim text.