Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-08-24
1991-01-01
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
049821610
ABSTRACT:
A magnetic resonance imaging method of fast contemporaneous aquisition of differently weighted plural images using sequences having cycles composed of a plurality of different sub-cycles or modes which interact to produce a steady state free precession spin ensemble. Each sub-cycle has an rf excitation pulse and gradient magnetic field variations in orthogonal directions. For each sub-cycle, the excitation pulse flip angle, the sub-cycle duration, and the vector gradient integral over the sub-cycle is the same in each cycle. The sub-cycles differ from each other in at least one of pulse angle, duration and gradient integral. The gradient waveforms are chosen so that the steady state free precession spin ensemble, when represented in k-space, has spaced-apart differently weighted image transform lobes, a plurality of which are scanned by k-space excursions in each sub-cycle exciting gradient echo signals which may be separately collected for each image transform lobe of interest.
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North American Philips Corporation
Slobod Jack D.
Tokar Michael J.
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