Nutation angle measurement during MRI prescan

Details Nutation angle measurement during MRI prescan Nutation angle measurement during MRI prescan

1993-09-30

1995-05-16

O'Shea, Sandra

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, 324313, G01R 3320

Patent

active

054164125

ABSTRACT:
A prescan for an MRI system (FIG. 1) automatically sets the rf power level to produce an excitation field that nutates spins in the image plane the amount prescribed by the scan. Nutation angle is measured with a pulse sequence comprised of three slice selective excitation pulses that produce a set of frequency encoded NMR echo signals (E.sub.1, S.sub.1, E.sub.2, E.sub.23, E.sub.13). Nutation angle is calculated at locations in the image slice from the Fourier transformation of these signals and the maximum nutation angle is employed to calculate the final rf power level setting for the scan.

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