Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-12-27
1996-07-02
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
36441316, 36441317, 378901, 382131, G06F15900, G01T 1166
Patent
active
055324908
ABSTRACT:
A SPECT camera system has three detector heads (12a, 12b, 12c). Each of the detectors have a fan-beam collimator (14) disposed toward an examination region (10). The detectors receive radiation travelling along a fan of rays from an apex (x.sub.f,y.sub.f) to a planar face of the detectors. The detectors generate electronic data indicative of a location (x.sub.s,y.sub.s) on the detector at which a radiation event is received along a ray q.sub..beta. (s). The detectors in a selected orbit R(.beta.) around a subject within the examination region (10). A backprojector (56) includes a backprojection trajectory calculating processor (60) that calculates a trajectory through image space, hence through an image memory (58), corresponding to each radiation ray q.sub..beta. (s). The backprojector weights (68) each data value (x.sub.s,y.sub.s) with a weighting function, preferably a Jacobian J(r,.phi.,.beta.), and adds (64) each weighted data value to a corresponding memory cell of the image memory (58). An indexer (62) indexes the memory addresses (66) in the image memory to index the memory cells to which the weighted data value is added and indexes the weighting function (54) such that the weighting function changes along the trajectory. With the preferred 1/r weighting function, where r is distance along a radial polar coordinate in image space, the resultant image is blurred. The blurring is removed by deconvolving (70) the blurred image representation in accordance with 1/r to generate a corrected image stored in a corrected image memory (80).
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patent: 5406479 (1995-04-01), Harman
"An Elliptical Orbit Backprojection Filtering Algorithm for SPECT", Gullberg, et al., 1992 IEEE Nuclear Sci. Symposium & Med. Imag. Conference Feb. 1993, pp. 1207-1209.
"An Elliptical Orbit Backprojection Filtering Algorithm for SPECT", Gullberg, et al., IEEE Trans. on Nucl. Science, vol. 40, No. 4, Oct. 1993 pp. 1102-1106.
Gullberg Grant T.
Zeng Gengsheng L.
Hannaher Constantine
The University of Utah
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