| 摘要 |
A xenon gas system (B) introduces xenon gas into a patient's blood. The xenon concentration in the patient's blood is monitored (26) periodically as the concentration builds toward a saturation level (32). The absorption data is divided into at least three curved segments (32, 34, 36) each of which are approximated by a curve segment to determine absorption curve characteristics. The amplitude of the saturation curve segment is determined as first characteristic; the slope of the second curve segment is a second characteristic; and an end amplitude and time constant of an exponential third curve segment provide third and fourth characteristics indicative of blood xenon absorption. A CT scanner (A) generates a plurality of time displaced image representations, each of which is subtracted (52) from a reference image (30) to determine difference image representations. Each image representation includes a plurality of pixels that correspond to subregions of a region of interest within the patient. A look-up table (60) is addressed by the absorption curve characteristics and corresponding pixel values to retrieve corresponding partition coefficient, blood flow, and fit or confidence values for each pixel. A video display (76) displays images indicative of the partition coefficient, blood flow rate, or confidence value of the imaged pixels.
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