Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1980-06-19
1984-01-03
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
2502521, G01T 120, G01D 1800
Patent
active
044244460
ABSTRACT:
A map of a radiation field produced by a gamma camera is corrected for three types of spatially dependent errors in a manner that corrects for each error independently of the others. The errors corrected for are dislocations which result from the non-linearity of the optics, photomultipliers and electronics of the camera, energy window variations resulting from inhomogeneity of the optical system which includes the crystal, light guide, and photomultipliers, and the non-uniform sensitivity of the head resulting from the non-uniform stopping power of the crystal and collimator of the camera head. The map is corrected by obtaining a set of correction factors associated with each type of error using a calibration technique that insures independence between the various correction factors, and applying the correction factors to the map obtained in a nuclear imaging process in a way that independently corrects the map for each type of error.
REFERENCES:
patent: 3745345 (1973-07-01), Muehllehner
patent: 3978336 (1976-08-01), Roux
patent: 4095108 (1978-06-01), Inbar et al.
patent: 4212061 (1980-07-01), Knoll et al.
patent: 4223388 (1980-09-01), Nishikawa et al.
patent: 4228515 (1980-10-01), Genna et al.
Gafni Giora
Grimberg Ernest
Inbar Dan
Koren Jacob
Elscint Ltd.
Howell Janice A.
Smith Alfred E.
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