Apparatus for measuring xenon concentration in xenon cerebral bl

Details Apparatus for measuring xenon concentration in xenon cerebral bl Apparatus for measuring xenon concentration in xenon cerebral bl

1984-11-07

1985-08-20

Gantz, D. E.

Surgery

Truss

Pad

128719, 128716, 128730, A61B 600

Patent

active

045357803

ABSTRACT:
Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies operates under the control of a microprocessor which is used to monitor the patient's breathing cycle and to control a sampling pump in order to assure that only end-tidal gas is sampled. A xenon gas mixture is delivered to a patient by means of a mask assembly. At the end of each exhale cycle, the patient's end-tidal gas is held in a chamber on the exhale side of the mask assembly. At the start of the next inhale cycle, the microprocessor activates the sampling pump which draws end-tidal gas into a thermal conductivity detector. The output of the detector is transmitted through an A/D converter and the resultant value stored in the microprocessor memory along with the time of the sample. At the completion of a CT scan series, the accumulated data in the microprocessor is transferred to the CT-system-housed computer to be used in the reconstruction of cerebral blood-flow images using conventional techniques.

REFERENCES:
patent: 3913379 (1975-10-01), Rusz et al.
Seylaz et al., "Analytical Problems Associated with the Noninvasive Measurements of Cerebral Blood Flow in Cerebrovascular Diseases", Medical & Biological Eng. & Computing, Jan. 1980, pp. 39-47.

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