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Diagnostic apparatus for measuring changes of arterial and venous blood volumes in brain with respiration signal modulation
Diagnostic apparatus for measuring changes of arterial and venous blood volumes in brain with respiration signal modulation
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机译:用于通过呼吸信号调制来测量大脑中动脉和静脉血容量变化的诊断设备
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摘要
A diagnostic apparatus includes light sources which emit near infrared light rays of different wavelengths. The light rays are introduced into human brain to be subjected to diagnosis and the light rays transmitted through the brain are picked up. There are provided a first detector which detects occurrences of respirations of the subject and outputs a respiration signal, and a second detector which detects occurrences of heartbeats of the subject and outputs a heartbeat signal. The light transmitted through the brain is derived in synchronism with both the respiration signal and the heartbeat signal and first and second modulated light transmission signals are produced which are respectively modulated by the respiration signal and the heartbeat signal. The first and second modulated light transmission signals are separately analyzed to provide variations in concentration of oxygenated media &Dgr;X.sub. 02 and disoxygenated media &Dgr;X contained in venous and arterial blood of the brain, respectively. Based thereon, oxygen saturations of both venous and arterial blood flowing in the brain are separately computed and displayed in a monitor screen.
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