Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1995-10-04
1997-10-14
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3354
Patent
active
056776276
ABSTRACT:
A magnetic resonance (MR) multislice method, in which in each cycle nuclear magnetization is successively excited in a respective group of measuring slices which are situated at a distance from one another and the MR signals generated under the influence of at least one gradient magnetic field are acquired, is such that the groups of measuring slices excited in different cycles exhibit a spatial offset relative to one another which is smaller than the distance between the measuring slices excited in a cycle and the gradient magnetic fields are varied from one cycle to another. The nuclear magnetization distribution in a reconstruction slice is reconstructed from the MR signals acquired in the various cycles and originating from measuring slices which neighbour one another in space and are situated to both sides of the reconstruction slice. In such a multislice method, reconstruction is improved in that the direction of the gradient of the gradient magnetic field active during the acquisition of the MR signal is varied from one cycle to another in such a manner that the directions occurring in all cycles together are distributed over an angular range of 360.degree., the directional differences being greater as the offset between the groups of measuring slices associated with the cycles is greater. Further the MR signals from measuring slices situated at a small distance from the reconstruction slice enter the reconstruction with a weighting factor which is higher than that of the MR signals from measuring slices situated at a greater distance from the reconstruction slice.
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O'Shea Sandra L.
Phillips Roger C.
Slobod Jack D.
U.S. Philips Corporation
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