Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-11-13
1992-11-10
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
051627302
ABSTRACT:
A method, in the form of a pulse sequence for operating a magnetic resonance imaging tomography apparatus according to a modification of the echo planar method includes the generation of a read-out gradient consisting of sub-pulses having reversing polarity, the read-out gradient being activated in each scan after an RF excitation. A phase coding gradient, also consisting of a number of sub-pulses, is activated at each polarity change of the read-out gradient. The sub-pulses of the phase coding gradient have a polarity which alternates from sub-pulse to sub-pulse, and an amplitude-time area which increases in steps. An improved signal-to-noise ratio is achieved with this pulse sequence and N/2 ghosts are avoided.
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patent: 4740748 (1988-04-01), Rzedzian
patent: 4767991 (1988-08-01), Rzedzian
patent: 4794337 (1988-12-01), Twieg
patent: 4868502 (1989-09-01), Hanakawa et al.
"Recent Advances in Magnetic Resonance Imaging", Riederer, Proceedings of the IEEE, vol. 76, No. 9, Sep. 1988 (pp. 1095-1105).
Fischer Hubertus
Schmitt Franz
Arana Louis
Siemens Aktiengesellschaft
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