Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1986-06-27
1988-03-01
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324312, 128653, G01R 3320
Patent
active
047288906
ABSTRACT:
A pulse sequencer (40) controls a resonance excitation controls circuit (22), an inversion pulse controls circuit (24), a slice select gradient controls circuit (32), a read gradient controls circuit (34), and a phase encode gradient controls circuit (36) to cause an appropriate gradient pulse imaging sequence to be generated in the image region. The operator selects an appropriate imaging sequence such as a spin echo, inversion recovery, multi-echo, radient echo, or other conventional imaging sequence and the parameters, such as the number of repetitions, from an image pulse sequence and motion desensitization memory (44, 46). In the exemplary pulse sequences of FIGS. 2-4, this memory directs the formation of RF pulses (62, 66), slice selection pulses (60, 64) and read gradient pulse (70), phase encode gradient pulse (72), and the appropriate additional gradient pulses for rephasing signals from one or more of static, constant velocity, accelerating, and pulsatilitory tissue in the image region. By rephasing the magnetic resonance signal components from tissue moving with the selected motion characteristics such that the corresponding moments in time are set equal to zero, motion artifacts from moving tissue are suppressed.
REFERENCES:
patent: 4516075 (1985-05-01), Moran
patent: 4549139 (1985-10-01), MacFall
patent: 4549140 (1985-10-01), MacFall
patent: 4564017 (1986-01-01), Glover
patent: 4567893 (1986-02-01), Charles
patent: 4581581 (1986-04-01), Pelc
patent: 4616180 (1986-10-01), Compton
McNally James E.
Pattany Pradip M.
Levy Stewart J.
O'Shea Kevin D.
Picker International Inc.
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