The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 1996
Filed:
Dec. 20, 1993
Yu-Lung Hsieh, Salt Lake City, UT (US);
Gengsheng L Zeng, Salt Lake City, UT (US);
Grant T Gullberg, Salt Lake City, UT (US);
University of Utah, The, Salt Lake City, UT (US);
Abstract
A SPECT camera (A) includes a plurality of detector heads (12a, 12b, 12c) which rotate around an examination region (10). A reconstruction processor (50) reconstructs output projection data from the detector heads into a three-dimensional image representation which is stored in an image memory (62). Selected data from the image memory (62) is converted to a human-readable display on a video monitor (66). To adjust automatically for detector head misalignment, a calibration phantom (B) which has two orthogonal lines of scintillators (20.sub.1, 20.sub.2, 20.sub.3, 20.sub.4, 20.sub.5) arranged orthogonal to each other with a common scintillator in both lines is positioned in the examination region. As the detector heads rotate around the phantom, a misalignment parameter generator (40) generates the displacement distance of the actual rotation from the theoretical rotation axis (.zeta.), the actual rotation radius (R), a projection of the location of the focal point on a detector plane of the detector head in the transaxial direction (C.sub..xi.), and a focal length of the collimator (F). A correction processor (42) corrects the reconstruction processor (50) in accordance with the generated misalignment parameters. In the preferred embodiment, the correction processor provides a revised weighting function to the reconstruction processor and modifies its backprojection algorithm.