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:
Aug. 25, 1992
Filed:
Nov. 23, 1988
Walter W Lindstrom, Shaker Hts., OH (US);
Picker International, Inc., Highland Hts., OH (US);
Abstract
A patient breathing through a mask (34) receives breathing air from a breathing air system (A). A xenon gas supply (12) selectively supplies xenon or other enhancement gases into the breathing air. During each exhalation portion of a respiratory cycle, a portion of the exhaled gas passes through a narrow tube (40) to a xenon concentration detector (44) and a carbon dioxide concentration detector (46). A carbon dioxide concentration comparing circuit (54) compares the carbon dioxide concentration values with characteristics (56) of carbon dioxide concentration during an end-tidal portion of the exhalation respiratory cycle. Xenon concentrations read during the end-tidal portion of the respiratory cycle (62) are utilized to project a blood absorption curve (64). A plurality of CT images are generated by a CT scanner (B) as the blood xenon concentration increases. A look-up table array (90) preprogrammed in accordance with the Kety equations is addressed by the blood xenon concentration curve and the pixel values of the CT images to generate partition coefficient and flow values.