Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-11-18
1996-09-03
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
25036307, 250369, 378901, G01T 1161, G01T 1163
Patent
active
055526055
ABSTRACT:
A SPECT camera system has detector heads (14a, 14b, 14c) each having a collimator (18) facing toward an examination region (10). The detectors receive emission radiation from a radioisotope injected into a subject in the examination region and, preferably, also receive transmission radiation from a transmission source (20) disposed across the examination region. The detectors rotate around the subject through a plurality of projection angles. The detectors generate projection views from the received radiation for each projection angle. The projection views are stored in a projection view memory (26). A reconstruction processor (38) reconstructs the projection views into a volumetric image representation that is stored in a volumetric image memory (40). A reprojector (42) reprojects the volumetric image and volume of interest along each projection angle producing a set of reprojection views and regions of interest. A view comparator (50) compares each corresponding projection and reprojected view within the region of interest along a common projection direction. A translator (52) translates or offsets each projection view in accordance with the comparison to produce a corrected or shifted projection view. The corrected projection views are then reconstructed to produce a motion corrected volumetric image representation. This procedure may be iterated to optimize the motion correction.
REFERENCES:
patent: 4858128 (1989-08-01), Nowak
patent: 5173608 (1992-12-01), Motomura et al.
patent: 5210421 (1993-05-01), Gullberg et al.
patent: 5287276 (1994-02-01), Crawford et al.
patent: 5337231 (1994-08-01), Nowak et al.
Fields Carolyn E.
Glick Edward J.
Picker International Inc.
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