Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-03-30
1988-05-24
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
047468645
ABSTRACT:
In an MRI system of this invention, a pulsed RF magnetic field, and pulsed slice, phase encoding, and read gradient fields are applied to an object to be examined placed in a uniform static magnetic field in accordance with a predetermined sequence by a controller, thereby causing an MR phenomenon. Echo signals based on the MR phenomenon are acquired so as to obtain an image of MR data. The controller alternately and repetitively executes a first operation for applying the read gradient field while repetitively inverting it so as to produce the echo signal, and a second operation for applying, as the radio-frequency magnetic field, a 180.degree. pulse which can compensate for an echo signal phase error due to a nonuniformity and offset of the static magnetic field so as to generate the echo signal. The controller also inverts the phase encoding gradient field each time the 180.degree. pulse is applied.
REFERENCES:
patent: 4165479 (1979-08-01), Mansfield
patent: 4625170 (1986-11-01), Yamamoto
patent: 4689567 (1987-08-01), Maudsley
Journal of Magnetic Resonance 29, 355-373 (1978) Biological and Medical Imaging by NMR P. Mansfield and I. L. Pykett.
Kabushiki Kaisha Toshiba
Tokar Michael J.
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