Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies
    1.
    发明公开
    Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies 失效
    仪表的氙含量,观察脑血流。

    公开(公告)号:EP0180876A2

    公开(公告)日:1986-05-14

    申请号:EP85113646.5

    申请日:1985-10-26

    CPC classification number: A61B6/481 A61B5/0813 A61B6/507

    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.

    Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies
    2.
    发明公开
    Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies 失效
    用于测量氙气血液流量研究中的氙浓度的装置

    公开(公告)号:EP0180876A3

    公开(公告)日:1987-08-26

    申请号:EP85113646

    申请日:1985-10-26

    CPC classification number: A61B6/481 A61B5/0813 A61B6/507

    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.

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