Multiband, multishot magnetic resonance elastography
First Claim
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1. A method of magnetic resonance elastography, the method comprising:
- applying, by a system including a processor, a multiband radio frequency (RF) excitation pulse to a sample, wherein the sample is divided into a plurality of slabs that each include a plurality of non-adjacent slices;
applying, by the system, first and second motion encoding gradients and a multiband RF refocusing pulse to the sample, wherein the first motion encoding gradient is applied before the multiband RF refocusing pulse, and wherein the second motion encoding gradient is applied after the multiband RF refocusing pulse;
acquiring, by the system, a blipped, spiral-in three dimensional navigator data;
providing, by the system, a gradient blip normal to the non-adjacent slices to define a sample plane;
acquiring, by the system, in-plane k-space data after the second motion encoding gradient is applied and after the gradient blip is provided; and
repeating the applying of the multiband RF excitation pulse, the applying of the first and second motion encoding gradients and the multiband RF refocusing pulse, and the acquiring of the in-plane k-space data over the plurality of slabs to obtain three dimensional multiband, multishot data.
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Abstract
A method and system provides an acquisition scheme for generating magnetic resonance elastography displacement data with whole-sample coverage, high spatial resolution, and adequate SNR in a short scan time. The method and system can acquire in-plane and through-plane k-space shots over a volume of a sample divided into a plurality of slabs that each include a plurality of non-adjacent slices to obtain three dimensional multiband, multishot data, can apply multiband radio frequency refocusing pulses to the sample, can acquire navigators before readout, and can correct for non-linear motion errors.
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Citations
20 Claims
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1. A method of magnetic resonance elastography, the method comprising:
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applying, by a system including a processor, a multiband radio frequency (RF) excitation pulse to a sample, wherein the sample is divided into a plurality of slabs that each include a plurality of non-adjacent slices; applying, by the system, first and second motion encoding gradients and a multiband RF refocusing pulse to the sample, wherein the first motion encoding gradient is applied before the multiband RF refocusing pulse, and wherein the second motion encoding gradient is applied after the multiband RF refocusing pulse; acquiring, by the system, a blipped, spiral-in three dimensional navigator data; providing, by the system, a gradient blip normal to the non-adjacent slices to define a sample plane; acquiring, by the system, in-plane k-space data after the second motion encoding gradient is applied and after the gradient blip is provided; and repeating the applying of the multiband RF excitation pulse, the applying of the first and second motion encoding gradients and the multiband RF refocusing pulse, and the acquiring of the in-plane k-space data over the plurality of slabs to obtain three dimensional multiband, multishot data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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an actuator for applying a vibration to a sample; a magnetic resonance system for facilitating applying magnetic resonance elastography to the sample; a processor coupled with the actuator and the magnetic resonance system; and a memory that stores executable instructions which, responsive to being executed by the processor, facilitate performance of operations, comprising; applying first and second motion encoding gradients and a multiband radio frequency (RF) excitation pulse to the sample, wherein the multiband RF excitation pulse is applied before the first motion encoding gradient, and wherein the second motion encoding gradient is applied after a multiband RF refocusing pulse; acquiring a blipped, spiral-in three dimensional navigator data; providing a gradient blip to define a sample plane; acquiring in-plane k-space data after the gradient blip is provided; and repeating the applying of the multiband RF excitation pulse, the first and second motion encoding gradients, the multiband RF refocusing pulse and the acquiring of the in-plane k-space data over a plurality of slabs comprising non-adjacent slices to obtain three dimensional multiband, multishot data. - View Dependent Claims (12, 13, 14, 15)
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16. A computer-readable storage device comprising computer instructions which, responsive to being executed by a processor, facilitate performance of operations, comprising:
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applying a multiband radio frequency (RF) excitation pulse to a sample that is divided into a plurality of slabs that each include a plurality of non-adjacent slices; applying first and second motion encoding gradients and a multiband RF refocusing pulse to the sample, wherein the first motion encoding gradient is applied before the multiband RF refocusing pulse and the second motion encoding gradient is applied after the multiband RF refocusing pulse; acquiring a blipped, spiral-in three dimensional navigator data; providing an encoded gradient blip to define a sample plane; acquiring an in-plane k-space shot comprising the plurality of non-adjacent slices after the second motion encoding gradient is applied; and repeating the applying of the multiband RF excitation pulse, the applying of the first and second motion encoding gradients and the multiband RF refocusing pulse, and the acquiring of the spiral-in three dimensional navigator data and the in-plane k-space shot over the plurality of slabs of the sample to obtain three dimensional multiband, multishot data. - View Dependent Claims (17, 18, 19, 20)
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Specification