Three dimensional multislab, multi-shot 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 first refocusing pulse to a sample, wherein the sample is divided into a plurality of slabs that each include a plurality of slices;
applying, by the system, first and second motion encoding gradients to the sample, wherein the first motion encoding gradient is applied before the first refocusing pulse, and wherein the second motion encoding gradient is applied after the first refocusing pulse;
providing, by the system, a plurality of gradient blips to define a plurality of sample planes of one of the plurality of slabs;
acquiring, by the system, a k-space shot after the second motion encoding gradient is applied, wherein the k-space shot is acquired according to a stack of in-plane samples separated according to the plurality of gradient blips to obtain a three-dimensional k-space sample of one of the plurality of slabs; and
repeating, by the system, the applying of the first refocusing pulse, the applying of the first and second motion encoding gradients and the acquiring of the k-space shot over the plurality of slabs to obtain three dimensional multislab, multishot data.
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Abstract
A method and system provides an acquisition scheme for generating MRE 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 k-space shots over a volume of a sample divided into a plurality of slabs that each include a plurality of slices to obtain three dimensional multislab, multishot data, can apply refocusing pulses to the sample, can acquire navigators after the refocusing pulses, and can correct for phase errors based on an averaging of the navigators.
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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 first refocusing pulse to a sample, wherein the sample is divided into a plurality of slabs that each include a plurality of slices; applying, by the system, first and second motion encoding gradients to the sample, wherein the first motion encoding gradient is applied before the first refocusing pulse, and wherein the second motion encoding gradient is applied after the first refocusing pulse; providing, by the system, a plurality of gradient blips to define a plurality of sample planes of one of the plurality of slabs; acquiring, by the system, a k-space shot after the second motion encoding gradient is applied, wherein the k-space shot is acquired according to a stack of in-plane samples separated according to the plurality of gradient blips to obtain a three-dimensional k-space sample of one of the plurality of slabs; and repeating, by the system, the applying of the first refocusing pulse, the applying of the first and second motion encoding gradients and the acquiring of the k-space shot over the plurality of slabs to obtain three dimensional multislab, 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 processing system including 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 processing system, facilitate performance of operations, the operations comprising; providing a plurality of gradient blips to define a plurality of sample planes of one of a plurality of slabs; acquiring a k-space shot over the plurality of sample planes of the one of the plurality of slabs, wherein the plurality of slabs define a volume of the sample, and wherein the one of the plurality of slabs includes a plurality of slices corresponding to the plurality of sample planes; repeating the acquiring of the k-space shot for each of the plurality of slabs to obtain three dimensional multislab, multishot data; applying refocusing pulses to the sample; acquiring three-dimensional navigators after the refocusing pulses; and correcting for phase errors based on an averaging of the three-dimensional navigators. - View Dependent Claims (12, 13, 14, 15)
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16. A machine-readable storage device comprising executable instructions which, responsive to being executed by a processing system including a processor, facilitate performance of operations, the operations comprising:
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applying a first refocusing pulse to a sample that is divided into a plurality of slabs that each include a plurality of slices; applying first and second motion encoding gradients to the sample, wherein the first motion encoding gradient is applied before the first refocusing pulse, and wherein the second motion encoding gradient is applied after the first refocusing pulse; providing a plurality of gradient blips to define a plurality of sample planes of a slab of the plurality of slabs that define a volume of the sample; acquiring a k-space shot over the plurality of sample planes after the second motion encoding gradient is applied; and repeating the applying of the first refocusing pulse, the applying of the first and second motion encoding gradients and the acquiring of the k-space shot over the plurality of sample planes of each slab of the plurality of slabs of the sample to obtain three dimensional multislab, multishot data. - View Dependent Claims (17, 18, 19, 20)
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Specification