Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1994-01-26
1996-12-24
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
055876579
ABSTRACT:
A magnetic resonance imaging apparatus comprises a static magnetic field forming magnet, gradient coils, a transmitter for transmitting an excitation pulse directed at a phantom, with the phantom having a non-magnetic material containing candidate nuclear species for magnetic resonance and having a periodic structure along the phase encoding direction. The magnetic resonance imaging apparatus further has a receiver for receiving echo signals from the non-magnetic material with the echo signals being outputted as echo data, a sequencer for controlling the gradient coils, the transmitter and the receiver thereby generating a plurality of echo signals of varying echo times at each excitation pulse while varying the strength of the phase-encoding gradient magnetic field pulses. The sequencer further controls the acquisition of the echo data required to reconstruct a MR image in split scans on the Fourier space. The resonance imaging apparatus further has a display unit for displaying the distribution of the echo data output from the receiver on the Fourier space. Finally, the imaging apparatus has an input unit for adjusting a reference strength of the phase-encoding gradient magnetic field pulse so that echo data corresponding to spatial frequencies in the phase-encoding direction, which are the inverse and an integral multiple of a predetermined period of the periodic structure of the non-magnetic material in the phantom, is maximized.
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Arana Louis M.
Kabushiki Kaisha Toshiba
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