Nuclear magnetic resonance imaging with high speed and interactive pulse sequence control
First Claim
1. A method for pulse sequence control in a nuclear magnetic resonance imaging, comprising the steps of:
- measuring characteristic parameters affecting a pulse sequence;
simulating an execution of the pulse sequence by using simulated RF pulses, simulated gradient magnetic fields, simulated static magnetic field, and simulated nuclear spin density distribution, according to the characteristic parameters measured at the measuring step, to obtain a result of a simulation as a spin motion and an echo signal resulting from the simulated RF pulses, the simulated gradient magnetic fields, the simulated static magnetic field, and the simulated nuclear spin density distribution; and
automatically adjusting the pulse sequence to an optimum setting according to the result of the simulation obtained at the simulating step.
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Abstract
A nuclear magnetic resonance imaging capable of controlling a generation of a desired pulse sequence to be used interactively, realizing the adjustment of the pulse sequence easily and accurately, and realizing the high speed pulse sequence execution. The pulse sequence is automatically generated from a basic pulse sequence form and a parameter block storing the imaging parameters affected by the imaging conditions specified interactively. The pulse sequence is then automatically adjusted to an optimum setting by simulating an execution of the pulse sequence by using simulated RF pulses, gradient magnetic fields, static magnetic field, and nuclear spin density distribution, according to the characteristic parameters measured in advance. In the actual execution of the pulse sequence, the event codes stored in the event memory of the sequence controller are decoded by a plurality of decoders in parallel, and the rewriting of the event memory is realized by using a rewriting table having entries specifying a manner of rewriting each slot of each entry in the event memory, and flags in the event memory indicating an appropriate rewriting table entry for each slot.
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Citations
14 Claims
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1. A method for pulse sequence control in a nuclear magnetic resonance imaging, comprising the steps of:
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measuring characteristic parameters affecting a pulse sequence; simulating an execution of the pulse sequence by using simulated RF pulses, simulated gradient magnetic fields, simulated static magnetic field, and simulated nuclear spin density distribution, according to the characteristic parameters measured at the measuring step, to obtain a result of a simulation as a spin motion and an echo signal resulting from the simulated RF pulses, the simulated gradient magnetic fields, the simulated static magnetic field, and the simulated nuclear spin density distribution; and automatically adjusting the pulse sequence to an optimum setting according to the result of the simulation obtained at the simulating step. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for pulse sequence control in a nuclear magnetic resonance imaging, comprising:
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measurement means for measuring characteristic parameters affecting a pulse sequence; simulator means for simulating an execution of the pulse sequence by using simulated RF pulses, simulated gradient magnetic fields, simulated static magnetic field, and simulated nuclear spin density distribution, according to the characteristic parameters measured by the measurement means, to obtain a result of a simulation as a spin motion and an echo signal resulting from the simulated RF pulses, the simulated gradient magnetic fields, the simulated static magnetic field, and the simulated nuclear spin density distribution; and pulse sequence adjustment means for automatically adjusting the pulse sequence to an optimum setting according to the result of the simulation obtained by the simulator means. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification