Variable rate magnetic resonance selective excitation for reducing rf power and specific absorption rate
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Feb 27, 1987
filing date -
Feb 27, 1987
priority date (Note) -
Expired
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Abstract
In magnetic resonance imaging where a subject is placed in a static field and the subject is selectively excited by applying an RF magnetic field in the presence of a gradient magnetic field, the peak RF power of the RF magnetic field is reduced by decreasing the peak amplitude of the RF magnetic field while concurrently reducing the magnitude of the gradient magnetic field. The incremental time duration for the RF magnetic field portion which is reduced in amplitude is proportionately increased. In using an RF pulse having front and back sidelobes with a positive lobe therebetween, the duration of the RF pulse can be reduced by increasing the magnitudes of the sidelobes and concurrently reducing the time periods of the sidelobes. A minimum SAR embodiment can be realized.
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