MR imaging apparatus

Details MR imaging apparatus MR imaging apparatus

1994-12-13

1996-05-28

Tokar, Michael

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

1286532, G01V 300

Patent

active

055215050

ABSTRACT:
An MR imaging apparatus using NMR phenomenon includes a main magnet, a first to a third gradient field coils, a RF coil, a RF emitter, a slice-selecting gradient field pulse generator, a reading gradient field pulse generator, a phase-encoding gradient field pulse generator and a data processor. The phase-encoding gradient field pulse generator effects phase-encoding, such that phase-encoding gradient field pulses have varied strengths to vary integrated phase encode amounts of spin echo signals from a positive (or negative) value through zero to a negative (or positive) value according to an order of generation; to vary, in a reversed direction, integrated phase encode amounts of each group of gradient echo signals having the same place in an order of generation thereof within respective pulse intervals; and to give the integrated phase encode amounts of each group of gradient echo signals greater absolute values than the integrated phase encode amounts of the spin echo signals.

REFERENCES:
patent: 4748410 (1988-05-01), Macovski
patent: 4993075 (1991-02-01), Sekihara
patent: 5270654 (1993-12-01), Feinberg et al.
patent: 5285158 (1994-02-01), Mistretta et al.
Proceedings of the Society of Magnetic Resonance in Medicine, Twelfth Annual Scientific Meeting, vol. 3, Aug. 14-20, 1993, p. 1233.
Magnetic Resonance in Medicine, vol. 26, No. 2, Aug. 1, 1992, Duluth, MN, pp. 355-360.
Magnetic Resonance in Medicine, vol. 20, No. 2, Aug. 1, 1991, Duluth, MN, pp. 344-349.
"Grase (Gradient-and Spin-Echo) Imaging: A Novel Fast MRI Technique,": Magnetic Resonance in Medicine 20, pp. 344-349, Koichi Oshio et al. Aug. 20, 1991.

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