Method for calibrating the amplitude of radiofrequency excitatio

Details Method for calibrating the amplitude of radiofrequency excitatio Method for calibrating the amplitude of radiofrequency excitatio

1987-05-04

1988-04-19

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

047392673

ABSTRACT:
Calibration of radiofrequency excitation involves application of two successive pulses of identical waveform and amplitude. The excitations are applied in series of excitations of variable amplitude from one excitation to the next in order to determine the calibrated value of the excitation pulses to be employed by transition of the amplitude of the received signal through a minimum value. It is demonstrated that this procedure prevents the calibration from being impaired by inhomogeneities of the orienting field of the apparatus. Spatial and spectral inhomogeneities of the excitation are also eliminated by applying throughout the calibration a selection gradient to the body under examination. Defects are eliminated by frequency filtering of the detected signal.

REFERENCES:
patent: 4486709 (1984-12-01), Bendall
patent: 4516582 (1985-05-01), Redington
patent: 4532473 (1985-07-01), Wehrli
patent: 4549139 (1985-10-01), MacFall
patent: 4563647 (1986-01-01), Young

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