METHOD AND APPARATUS FOR MEASURING TISSUE BY LIGHT

The invention relates to a method and a device for quantitative determination of the oxygen saturation in the blood from photometric measured values, which are obtained periodically by means of a photometer with a monochromator. Hitherto, essentially only qualitative conclusions could be drawn from...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MANFUREETO KESURAA, MANFUREETO BURUNNAA, REGIINA ERAAMAN
Format:	Patent
Sprache:	eng
Schlagworte:	COLORIMETRY DIAGNOSIS HUMAN NECESSITIES HYGIENE IDENTIFICATION INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING MEDICAL OR VETERINARY SCIENCE PHYSICS RADIATION PYROMETRY SURGERY TESTING
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Beschreibung
Zusammenfassung:	The invention relates to a method and a device for quantitative determination of the oxygen saturation in the blood from photometric measured values, which are obtained periodically by means of a photometer with a monochromator. Hitherto, essentially only qualitative conclusions could be drawn from photometric spectra. According to the invention, a first spectrum is taken from the periodic signal sequence, a predetermined number of additional spectra are chosen by shape comparison, a Fourier transformation of the spectra is carried out in the frequency domain and, on the basis of the amplitudes in the frequency domain, a calibration curve of at least two measurement samples is determined. The related device with an evaluation circuit comprises in this case at least one evaluation unit, a shape comparison unit, a unit for Fourier transformation and a calibration device. Routine use is therefore possible.