Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-02-01
1989-01-31
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
128653, G01R 3320
Patent
active
048018848
ABSTRACT:
An apparatus for identifying nuclear magnetic spectra from spatially selectable regions of an examination subject supplies pulse signals to the examination subject in the following sequence. A first, non-selective 90.degree. RF pulse is supplied to the patient so that the magnetization of the examination subject is oriented out of the z-direction into an x-y plane perpendicular thereto. A first, selective 180.degree. RF pulse is then supplied simultaneously with a first magnetic gradient G.sub.z which effects a dephasing of the spins outside of a first, selected slice S.sub.1. A second, selective 180.degree. RF pulse is then supplied simultaneously with a second magnetic gradient G.sub.x disposed perpendicularly to the first magnetic gradient. The second magnetic gradient effects a dephasing of the spins outside of a second selected slice S.sub.2. A second, selective 90.degree. RF pulse is then supplied simultaneously with a third magnetic gradient G.sub.y, which is disposed perpendicularly relative to the first and second magnetic gradients. A third 90.degree. RF pulse is then supplied, and the signal emitted by the examination subject in response thereto is evaluated.
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Hentschel Dietmar
Klose Uwe
Ladebeck Ralf
Oppelt Arnulf
Levy Stewart J.
O'Shea Kevin D.
Siemens Aktiengesellschaft
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