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:
Nov. 24, 1992
Filed:
Sep. 04, 1990
Carl J Brunnett, Willoughby Hills, OH (US);
Chris J Vrettos, Willoughby, OH (US);
Picker International, Inc., Highland Heights, OH (US);
Abstract
A CT scanner (10) includes a radiation source (12) mounted for rotation about a scan circle (14). A ring of radiation detectors (30) includes narrow detectors (30.sub.n) and wide detectors (30.sub.w). The narrow and wide detectors are separately sampled (42.sub.n, 42.sub.w) and operated on with different digital filters (50.sub.n, 50.sub.w). The wider detectors have a more limited frequency response (32) which typically includes an out of phase response portion (36); whereas, the output signal from the narrow detetector has a higher frequency response (34), i.e. better resolution. The filters (50.sub.n, 50.sub.w) are selected to yield optimum signal to noise ratio. When the data is merged (60), the resultant data has a modulation transfer function with response (62) which has a higher frequency component or improved resolution relative to response (70) that would be obtained from detectors of uniform width of the average of the narrow and detector widths.