Surgery – Truss – Pad
Patent
1986-11-24
1988-12-27
Smith, Ruth S.
Surgery
Truss
Pad
128659, 128719, A61B 600
Patent
active
047933577
ABSTRACT:
A xenon gas system (B) introduces xenon gas into a patients's blood. The xenon gas concentration in the patient's blood is monitored and the characteristics of the patient's blood absorption curve are determined (34). A look-up table array (60) includes a plurality of look-up tables, each look-up table corresponding to one of a plurality of preselected blood absorption curves. A look-up table selection circuit (36) selects the look-up table which most closely corresponds to the projected blood absorption curve. A CT scanner (A) generates a plurality of image representations at preselected intervals after commencement of xenon gas interpolation, which images are stored in an image memory array (44). Xenon gas concentration values from corresponding pixels of each image representation are utilized to address the look-up table corresponding most closely to the patient's blood absorption curve in order to retrieve precalculated partition coefficient, blood flow rate, and confidence values. The retrieved values may be interpolated (80, 82) to compensate for a patient's blood absorption curve falling among a plurality of curves or the measured xenon concentration values falling between the preselected addressable values of the look-up tables. A display (96) displays images indicative of the partition coefficient, the blood flow rate, and the confidence value.
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Picker International Inc.
Smith Ruth S.
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