System and method for magnetic resonance imaging using three-dimensional, distributed, non-Cartesian sampling trajectories
First Claim
Patent Images
1. A magnetic resonance imaging (MRI) system, comprising:
- a magnet system configured to generate a polarizing magnetic field about at least a bore of the MRI system that is configured to receive a subject to be imaged;
a magnetic gradient system including a plurality of magnetic gradient coils configured to apply at least one magnetic gradient field to the polarizing magnetic field;
a radio frequency (RF) system configured to apply an RF field to the subject and to receive magnetic resonance signals therefrom;
a computer system programmed to;
control the RF system to generate a base waveform having a trajectory beginning at an axis located at a center of k-space and extending to a periphery of k-space or beginning at the periphery of k-space and extending to end sampling at the axis located at the center of k-space;
control the RF system and the magnetic gradient system to generate a plurality of repetitions of the base waveform, each repetition of the base waveform rotationally offset by a predetermined angle about the axis with respect to adjacent repetitions of the base waveform to form a plurality of interleaved trajectories;
control the RF system and the magnetic gradient system to generate a plurality of repetitions of the plurality of interleaved trajectories initiated from locations aligned along the axis to sample k-space in three dimensions, wherein a cross-section of the plurality of repetitions of the plurality of interleaved trajectories extending along the axis is mirror-symmetric;
wherein samples along the trajectory are distributed at points with radial spacing
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for sampling k-space is provided that substantially simplifies the demands placed on the clinician to select and balance the tradeoffs of a particular selected sampling methodology. In particular, the present invention provides particularly advantageous sampling methodologies that simplify the selection of a particular k-space sampling methodology and, furthermore, the tradeoffs within a particular sampling methodology.
13 Citations
16 Claims
-
1. A magnetic resonance imaging (MRI) system, comprising:
-
a magnet system configured to generate a polarizing magnetic field about at least a bore of the MRI system that is configured to receive a subject to be imaged; a magnetic gradient system including a plurality of magnetic gradient coils configured to apply at least one magnetic gradient field to the polarizing magnetic field; a radio frequency (RF) system configured to apply an RF field to the subject and to receive magnetic resonance signals therefrom; a computer system programmed to; control the RF system to generate a base waveform having a trajectory beginning at an axis located at a center of k-space and extending to a periphery of k-space or beginning at the periphery of k-space and extending to end sampling at the axis located at the center of k-space; control the RF system and the magnetic gradient system to generate a plurality of repetitions of the base waveform, each repetition of the base waveform rotationally offset by a predetermined angle about the axis with respect to adjacent repetitions of the base waveform to form a plurality of interleaved trajectories; control the RF system and the magnetic gradient system to generate a plurality of repetitions of the plurality of interleaved trajectories initiated from locations aligned along the axis to sample k-space in three dimensions, wherein a cross-section of the plurality of repetitions of the plurality of interleaved trajectories extending along the axis is mirror-symmetric; wherein samples along the trajectory are distributed at points with radial spacing - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method comprising:
-
designing, with a computer system, a pulse sequence for use with a magnetic resonance imaging (MRI) system comprising; a base waveform having a trajectory beginning at an axis located at a center of k-space and extending to a periphery of k-space or beginning at the periphery of k-space and extending to end at the axis located at the center of k-space; a plurality of repetitions of the base waveform, each repetition of the base waveform rotationally offset by a predetermined angle about the axis with respect to adjacent repetitions of the base waveform to form a plurality of interleaved trajectories; a plurality of repetitions of the plurality of interleaved trajectories initiated from locations aligned along the axis to sample k-space in three dimensions, wherein a cross-section of the plurality of repetitions of the plurality of interleaved trajectories extending along the axis is mirror-symmetric; wherein samples along the trajectory are distributed at points with radial spacing - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method for controlling a magnetic resonance imaging (MRI) system to acquire medical imaging data from a subject, the method comprising:
-
designing a pulse sequence comprising a base waveform having a trajectory beginning at an axis located at a center of k-space and extending to a periphery of k-space or beginning at the periphery of k-space and extending to end at the axis located at the center of k-space; a plurality of repetitions of the base waveform, each repetition of the base waveform rotationally offset by a predetermined golden angle about the axis with respect to adjacent repetitions of the base waveform to form a plurality of interleaved trajectories; a plurality of repetitions of the plurality of interleaved trajectories initiated from locations aligned along the axis to sample k-space in three dimensions, wherein a cross-section of the plurality of repetitions of the plurality of interleaved trajectories extending along the axis; wherein samples along the trajectory are distributed at points (k) with radial spacing; performing the pulse sequence using the MRI system to collect medical imaging data of the subject; and reconstructing an image of the subject from the medical imaging data, wherein samples along the trajectory are distributed at points with radial spacing - View Dependent Claims (16)
-
Specification