Method for producing physical gradient waveforms in magnetic resonance imaging
First Claim
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1. A method for producing gradient waveforms in an MRI system, the steps comprising:
- specifying a logical gradient waveform for each gradient to be used in a pulse sequence;
detecting the break points in all the specified logical gradient waveforms;
producing a logical vector table which stores the amplitude of each specified logical gradient waveform at each detected break point;
producing a physical vector table by rotating the amplitudes stored in the logical vector table at each detected break point and storing physical amplitudes for each break point; and
producing physical gradient waveforms for each gradient axis on the MRI system by playing out the physical amplitudes stored in the physical vector table at successive break points.
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Abstract
An MRI system produces magnetic field gradients along physical axes during a patient scan. The gradients are specified as logical gradient waveforms in a pulse sequence and these are stored in a logical vector table. A physical vector table is produced by rotating amplitude values in the logical vector table, and the resulting rotated amplitude values are used to calculate the heating in each gradient axis of the MRI system.
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Citations
6 Claims
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1. A method for producing gradient waveforms in an MRI system, the steps comprising:
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specifying a logical gradient waveform for each gradient to be used in a pulse sequence; detecting the break points in all the specified logical gradient waveforms; producing a logical vector table which stores the amplitude of each specified logical gradient waveform at each detected break point; producing a physical vector table by rotating the amplitudes stored in the logical vector table at each detected break point and storing physical amplitudes for each break point; and producing physical gradient waveforms for each gradient axis on the MRI system by playing out the physical amplitudes stored in the physical vector table at successive break points. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification