Magnetic resonance system and method for time synchronization of different components of a magnetic resonance system
First Claim
1. A method for time synchronization of multiple components with each other in a magnetic resonance system, comprising:
- operating multiple components of a magnetic resonance data acquisition unit to generate a series of amplitude-modulated radio-frequency (RF) pulses and associated gradient fields, each of said amplitude modulated RF pulses comprising a signal envelope of that respective pulse that encompasses an RF portion at a frequency matched to a respective frequency of the nuclear spins, and thereby exciting said nuclear spins and deflecting magnetization of said nuclear spins in a slice of a subject in the data acquisition unit;
detecting at least two spin signals that result from the deflection of the magnetization of said nuclear spins;
in a processor, determining a phase difference between two of said spin signals;
in said processor, determining, from said phase difference, at least one time shift between two variables that are generated by different components of said data acquisition unit among said multiple components, selected from the group consisting of said envelope of said amplitude-modulated RF pulses, said RF portion of said amplitude-modulated RF pulses, and one or more of said gradient fields; and
from said processor, synchronizing said different components dependent on said at least one time shift.
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Abstract
A method for time synchronization of various components of a magnetic resonance system includes generating a series of amplitude-modulated radio-frequency pulses and associated gradient fields to deflect the magnetization of a slice detecting at least two spin signals, determining a phase difference between two of the spin signals, processing the phase difference in order to determine at least one time shift between two of the following variables that are generated by different components of the magnetic resonance system, an envelope of the amplitude-modulated radio-frequency pulses, a radio-frequency portion of the amplitude-modulated radio-frequency pulses, and one or more gradient fields, and synchronizing the associated components of the magnetic resonance system depending on the at least one time shift.
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Citations
10 Claims
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1. A method for time synchronization of multiple components with each other in a magnetic resonance system, comprising:
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operating multiple components of a magnetic resonance data acquisition unit to generate a series of amplitude-modulated radio-frequency (RF) pulses and associated gradient fields, each of said amplitude modulated RF pulses comprising a signal envelope of that respective pulse that encompasses an RF portion at a frequency matched to a respective frequency of the nuclear spins, and thereby exciting said nuclear spins and deflecting magnetization of said nuclear spins in a slice of a subject in the data acquisition unit; detecting at least two spin signals that result from the deflection of the magnetization of said nuclear spins; in a processor, determining a phase difference between two of said spin signals; in said processor, determining, from said phase difference, at least one time shift between two variables that are generated by different components of said data acquisition unit among said multiple components, selected from the group consisting of said envelope of said amplitude-modulated RF pulses, said RF portion of said amplitude-modulated RF pulses, and one or more of said gradient fields; and from said processor, synchronizing said different components dependent on said at least one time shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetic resonance system comprising:
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a magnetic resonance data acquisition unit comprising a plurality of components including radio-frequency coils and gradient coils; a control unit configured to operate the plurality of components of the magnetic resonance data acquisition unit to generate a series of amplitude-modulated RF pulses with said RF coils and associated gradient fields with said gradient coils, each of said amplitude modulated RF pulses comprising a signal envelope of that respective pulse that encompasses an RF portion at a frequency matched to a respective frequency of the nuclear spins, and thereby to excite said nuclear spins to deflect magnetization of nuclear spins in a slice of a subject in the data acquisition unit; said control unit being configured to operate said magnetic resonance data acquisition unit to detect at least two spin signals that result from the deflection of the magnetization of said nuclear spins; a processor configured to determine a phase difference between two of said spin signals; said processor being configured to determine, from said phase difference, at least one time shift between two variables that are generated by different components of said data acquisition unit among said plurality of components, selected from the group consisting of said envelope of said amplitude-modulated RF pulses, said RF portion of said amplitude-modulated RF pulses, and one or more of said gradient fields; and said processor being configured to synchronize said different components dependent on said at least one time shift.
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Specification