Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-10-05
1992-03-24
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
050992082
ABSTRACT:
An improved method and related apparatus is provided for magnetic resonance imaging with distortions due to magnetic field inhomogeneities and subject susceptibility corrected. The method includes providing a subject positioned within a main magnetic field, a source of RF signals, a receiver for receiving signals emitted from the subject responsive to the RF pulses and emitting responsive output signals, a computer for receiving the output signals from the receiver and establishing image information related thereto and a visual display for displaying images obtained from the image information. The improved method includes performing a first image generating sequence including generating a 90.degree. RF pulse while simultaneously applying a first slice selection gradient, a phase-encoding gradient and subsequently applying a first preparation gradient after which a 180.degree. refocussing pulse is generated. Subsequently a first read-out gradient is generated while the echo signal is read by the receiver. The sequences is repeated a sufficient number of times to create a first volume image. A second image generating sequence is performed which is similar to the first except that the slice selection gradient, the preparation gradient and the read-out gradient are changed by the same ratio. The second image thereby generated is combined by a computer to create a third, nondistorted image, which may then be delivered to a visual display or other application.
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Chang Hsuan
Fitzpatrick J. M.
Rooney Rita M.
Silverman Arnold B.
Tokar Michael J.
Vanderbilt University
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