Magnetic resonance imaging

Details Magnetic resonance imaging Magnetic resonance imaging

2007-06-12

2007-06-12

Shrivastav, Brij (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

Reexamination Certificate

active

11154958

ABSTRACT:
Through advancing the phase of radio frequency (RF) excitation with each phase-encoding level, a method and apparatus increases the effectiveness of a Magnetic Resonance Imaging (MRI) device by correcting for main magnetic field inhomogeneities without noticeably decreasing the signal-to-noise ratio. The present invention also increases the effectiveness of fast imaging with steady precession (FISP) scans and allows FISP scans to image multiple slices. In an MRI device, a patient is subjected to a constant magnetic field, and RF pulses are used to excite the nuclei in the patient's body. The nuclei release a corresponding RF signal as the nuclei relax, which can be measured and mapped into a visual display. The RF pulses used to excite the nuclei in the body cooperate with a slice select gradient and a phase-encoding gradient. When the RF pulse is phase shifted with each phase-encoding gradient level, improved signal-to-noise ratios are observed.

REFERENCES:
patent: 3968424 (1976-07-01), Ernst
patent: 4795978 (1989-01-01), Zur et al.
patent: 4825159 (1989-04-01), Oppelt et al.
patent: 4843322 (1989-06-01), Glover
patent: 5086275 (1992-02-01), Roemer
patent: 6307368 (2001-10-01), Vasanawala et al.
patent: 6714807 (2004-03-01), Zur
patent: 6828792 (2004-12-01), Danby et al.
Vasanawala, Shreyas et al., “Linear Combination Steady-State Free Precession MRI,”Magnetic Resonance in Medicine, vol. 43: pp. 82-90 (2000).
Zur, R. et al. “Motion-Insensitive, Steady-State Free Precession Imaging,”Magnetic Resonance in Medicine, vol. 16: pp. 444-459 (1990).
Schwenk, A. “NMR Pulse Technique with High Sensitivity for Slowly Relaxing Systems,”Journal of Magnetic Resonance.vol. 5: pp. 376-389 (1971).

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