Method of providing an RF pulse for use in NMR

Details Method of providing an RF pulse for use in NMR Method of providing an RF pulse for use in NMR

1995-08-21

1997-04-08

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324314, G01R 3320

Patent

active

056191383

ABSTRACT:
The invention relates to a method of determining prefocused pulses with sufficiently low power and short duration to allow multi-slice in-vivo spectroscopic imaging of humans. The method has two main stages, analytic and numerical. In the analytic stage a magnetization response is selected with certain desired characteristics such as prefocused time. During the numerical stage, the response is then transformed into an RF pulse for use in magnetic resonance imaging. The theoretical response to the RF pulse is evaluated and characteristics such as duration and amplitude may be altered to meet further requirements. The theoretical response is then transformed into an RF pulse for use in magnetic resonance imaging or for further application of the numerical stage.

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Wu et al, "Delayed Focus Pulses for MRI: An evolutionary Approach" Mag. Res. in Med. vol. 20 pp. 165-170 (1991).
Rourke et al, "Half solitons as solutions to the Zakharov-Shabat eigenvalue problem for rational reflection coefficient with application in the design of selective pulses in NMR" Phys. Rev. A vol. 46 No. 7, 1 Oct. 1992.

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