Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-09-30
1987-10-06
Myracle, Jerry W.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
046985930
ABSTRACT:
NMR response data usable to form a T1 NMR image is obtained by using constant repetition rate data acquisition cycles but wherein different initial nuclei nutation angles are employed to elicit NMR spin echo signal responses. Because of the different initial nutation angles employed to elicit the NMR responses, those responses will differ in accordance with an exponential function of the T1 spin-lattice relaxation time constant of the region under test. Once such T1-dependent data is captured, the T1 time constant may be calculated or otherwise derived (e.g. by an empirical best fit to an exponential curve of known time constant) to produce a T1 value for each incremental volume element (voxel) of the volume under test (e.g. a planar volume). In this manner a visual image of the T1 NMR parameter is created when the complete array of derived T1 values is converted to gray-scale (or color) values and displayed as corresponding picture elements (pixels) in a raster-scanned CRT display or the like. Such an approach may provide a significant speed improvement in the overall data acquisition time required to derive a T1 NMR image. Such speed improvements may be especially useful where large numbers of multiple slices through the object under test are being examined.
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Myracle Jerry W.
O'Shea Kevin D.
The Regents of the University of California
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