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

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Gur, David ,  Herron, John Moore ,  Pedersen, Robert Hans

IPC: A61B5/08 ,  A61B6/03

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.

公开(公告)号：EP0180876A3

公开(公告)日：1987-08-26

申请号：EP85113646

申请日：1985-10-26

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Gur, David ,  Herron, John Moore ,  Pedersen, Robert Hans

IPC: A61B05/08 ,  A61B06/03

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.