PHYSIOLOGICAL PROPERTY DETERMINATION APPARATUS
First Claim
1. A physiological property determination apparatus for determining a physiological property of a person, the physiological property determination apparatus comprising:
- at least two light sources for emitting at least two light beams having different wavelengths into tissue of the person,a light detector having a two-dimensional detection surface for detecting light, which has travelled through the tissue, wavelength-dependently and for generating a wavelength-dependent two-dimensional image based on the detected light, wherein the two-dimensional detection surface comprises a two-dimensional arrangement of detection elements, each detection element generating wavelength-dependent detection signals for generating the wavelength-dependent two-dimensional image,a controller for separately controlling the intensities of the light beams of the different light sources such that the light detector is not overloaded, anda physiological property determination unit for determining the physiological property based on the generated wavelength-dependent two-dimensional image, wherein the physiological property by linearly combining the detection signals, wherein, before linearly combining the detection signals, the detection signals are weighted, wherein the detection signals, which correspond to tissue regions where the perfusion is larger, obtain a larger weight than detection signals which correspond to tissue regions where the perfusion is smaller.
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Abstract
The invention relates to a physiological property determination apparatus (1) for determining a physiological property like a pulse rate of a person. The apparatus may be configured to be worn on the wrist like a watch. A controller (8) separately controls at least two light sources (3, 4, 5) for emitting at least two light beams having different wavelengths into tissue of the person and a light detector (6) having a two-dimensional detection surface (12) detects light, which has travelled through the tissue, wavelength-dependently and generates a wavelength-dependent two-dimensional image based on the detected light. Based on the generated wavelength-dependent two-dimensional image the physiological property is determined. The separate control of the light sources allows for an independent optimization of the illumination and detection processes for each wavelength, which in turn can lead to an improved determination of the physiological property based on the wavelength-dependent two-dimensional image.
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Citations
14 Claims
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1. A physiological property determination apparatus for determining a physiological property of a person, the physiological property determination apparatus comprising:
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at least two light sources for emitting at least two light beams having different wavelengths into tissue of the person, a light detector having a two-dimensional detection surface for detecting light, which has travelled through the tissue, wavelength-dependently and for generating a wavelength-dependent two-dimensional image based on the detected light, wherein the two-dimensional detection surface comprises a two-dimensional arrangement of detection elements, each detection element generating wavelength-dependent detection signals for generating the wavelength-dependent two-dimensional image, a controller for separately controlling the intensities of the light beams of the different light sources such that the light detector is not overloaded, and a physiological property determination unit for determining the physiological property based on the generated wavelength-dependent two-dimensional image, wherein the physiological property by linearly combining the detection signals, wherein, before linearly combining the detection signals, the detection signals are weighted, wherein the detection signals, which correspond to tissue regions where the perfusion is larger, obtain a larger weight than detection signals which correspond to tissue regions where the perfusion is smaller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12)
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8. (canceled)
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13. A physiological property determination method for determining a physiological property of a person, the physiological property determination method comprising:
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emitting at least two light beams having different wavelengths into tissue of the person by at least two light sources, detecting light, which has travelled through the tissue, wavelength-dependently and generating a wavelength-dependent two-dimensional image based on the detected light by a light detector having a two-dimensional detection surface, wherein the two-dimensional detection surface comprises a two-dimensional arrangement of detection elements, each detection element generating wavelength-dependent detection signals for generating the wavelength-dependent two-dimensional image, separately controlling the intensities of the light beams of the different light sources by a controller such that the light detector is not overloaded, and determining the physiological property based on the generated wavelength-dependent two-dimensional image by a physiological property determination unit, wherein the physiological property determination unit determines the physiological property by linearly combining the detection signals, wherein, before linearly combining the detection signals, the detection signals are weighted, wherein the detection signals, which correspond to tissue regions where the perfusion is larger, obtain a larger weight than detection signals which correspond to tissue regions where the perfusion is smaller.
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14. (canceled)
Specification