Prevention of steady state transverse magnetization in fast imag

Details Prevention of steady state transverse magnetization in fast imag Prevention of steady state transverse magnetization in fast imag

1987-07-29

1989-01-03

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3308

Patent

active

047959789

ABSTRACT:
Reduces artifacts in fast imaging sequences used in magnetic resonance imaging by changing the phase of the radio frequency pulse output of a synthesizer in order to prevent the transverse magnetization caused by the radio frequency pulses used for "tipping" aligned spins into the transverse plane from reaching a steady state condition. Steady state conditions are known to cause artifacts in the final images.

REFERENCES:
patent: 4443760 (1984-04-01), Edelstein et al.
patent: 4665365 (1987-05-01), Glover et al.
"Contrast in Rapid MR Imaging:T1 and T2 Weighted Imaging" by Buxton et al., vol. 11(1), pp. 7-16 (1987), J. Comp. Ass. Tomography.
"Mechanisms of Contrast in NMR Imaging" by Wehrli et al., J. Comp. Ass. Tom., vol. 8(3), pp. 369-380 (1984).
"Transverse Coherence in Rapid Flash NMR Imaging" by Frahm et al., J. Mag. Res., vol. 72, pp. 307-314 (1987).
"Visualization of Cerebral and Vascular Abnormalities by NMR Imaging. The Effects of Imaging Parameters on Contrast" by Crooks, L. E. et al., Radiology, vol. 144, pp. 843-852, (1982).
"Rapid Imaging Using Low Flip Angle Pulses" by Haase, A. et al., J. Mag. Res., vol. 66 (2), pp. 258-266 (1986).

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