Magnetic resonance relaxation along a fictitious field
First Claim
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1. A magnetic resonance (MR) system comprising:
- a driving module configured to apply a perturbation to a sample;
a processor configured to generate RF modulated pulses, the RF modulated pulses configured to define a plurality of at least three different rotating frames of reference relative to the perturbation, the plurality of at least three different rotating frames of reference including at least two frames in which each frame of the at least two frames includes a fictitious field and wherein at least one fictitious field is time variant, the fictitious fields are produced by an interaction of the plurality of the at least three different rotating frames of reference, and each different rotating frame is associated with an effective field, wherein the fictitious fields and the effective fields are associated with the generated modulated pulses and the modulated pulses are produced by a recursive expansion; and
a readout module coupled to the processor and configured to generate an output based on a relaxation of spins of the sample as a function of the perturbation in order to display or store a magnetic resonance output with the readout module.
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Abstract
A system includes a driving module, a processor, and a readout module. The driving module is configured to apply a perturbation to a sample. The processor is configured to define a plurality of different rotating frames relative to the perturbation, wherein each frame has a corresponding fictitious field. The readout module is coupled to the processor and is configured to generate an output based on relaxation of the sample as a function of the perturbation.
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Citations
22 Claims
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1. A magnetic resonance (MR) system comprising:
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a driving module configured to apply a perturbation to a sample; a processor configured to generate RF modulated pulses, the RF modulated pulses configured to define a plurality of at least three different rotating frames of reference relative to the perturbation, the plurality of at least three different rotating frames of reference including at least two frames in which each frame of the at least two frames includes a fictitious field and wherein at least one fictitious field is time variant, the fictitious fields are produced by an interaction of the plurality of the at least three different rotating frames of reference, and each different rotating frame is associated with an effective field, wherein the fictitious fields and the effective fields are associated with the generated modulated pulses and the modulated pulses are produced by a recursive expansion; and a readout module coupled to the processor and configured to generate an output based on a relaxation of spins of the sample as a function of the perturbation in order to display or store a magnetic resonance output with the readout module. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetic resonance method comprising:
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applying a perturbation to a system; generating RF modulated pulses, the RF modulated pulses configured to define a plurality of at least three different rotating frames relative to the perturbation, the plurality of at least three different rotating frames including at least two frames in which each frame of the at least two frames includes fictitious field and wherein at least one fictitious field is time dependent, the fictitious fields produced by interaction of the plurality of at least three different rotating frames, and wherein each different rotating frame is associated with an effective field and wherein the fictitious fields and the effective fields are associated with the modulated pulses and the modulated pulses are produced by a recursive expansion; and applying a readout module to the system after applying the perturbation in order to display or store a magnetic resonance output with the readout module. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory processor-implemented method which, when executed, causes a magnetic resonance system to generate a magnetic resonance image, the method comprising:
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selecting a rank for a fictitious frame of reference that images a region of interest in a spin system, wherein the selected rank corresponds to at least three different fictitious frames of reference; generating a sequence of modulated pulses that excites the spin system with the sequence of modulated pulses having a sweeping frequency and both a modulated amplitude and phase in which the effective field varies with time in the fictitious frame, wherein the effective field is associated with the sequence of modulated pulses and wherein the sequence of modulated pulses are produced by a recursive expansion; acquiring magnetic resonance data corresponding to the spin system, the data corresponding to relaxation of spins in the region of interest based on excitation from the sequence of modulated pulses; and generating an MR image with a processor based on the acquired data. - View Dependent Claims (20, 21)
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22. A magnetic resonance (MR) system comprising:
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a driving module configured to apply a perturbation to a sample; a processor configured to generate modulated pulses to define at least n different rotating frames of reference where n is an integer of at least three, the rotating frames of reference including at least n−
1 frames in which each of the n−
1 frames includes a fictitious field and wherein at least one fictitious field is time variant, the fictitious fields produced by interaction of the plurality of at least n different rotating frames of reference, and wherein each different rotating frame of reference is associated with an effective field and wherein the fictitious fields and the effective fields are associated with the modulated pulses and the modulated pulses are produced by a recursive expansion; anda readout module coupled to the processor and configured to generate an output based on relaxation of spins of the sample as a function of the perturbation that is displayed or stored by the MR system.
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Specification