Biological light measuring apparatus and method
First Claim
1. An optical measurement apparatus for living body comprising:
- a measurement channel including an irradiation use optical fiber which is set at an irradiation position on a body surface in an inspection area of a subject and irradiates an inspection light having a predetermined frequency of from visible to near infrared range and a light receiving use optical fiber which is set at a light receiving portion adjacent the irradiation use optical fiber on the body surface in the inspection area and receives the inspection light irradiated from the adjacent irradiation use optical fiber and penetrated through inside the subject;
a light detection unit which detects the amount of inspection light received by the light receiving use optical fiber in an electrical signal; and
a signal calculation and processing unit including a hemoglobin signal calculating unit which calculates a hemoglobin signal representing a hemoglobin concentration inside the subject through which the inspection light has penetrated based on the electrical signal detected by the light detection unit and an optical fiber setting adequacy evaluation unit which evaluates adequacy of setting on the body surface in the inspection area of the irradiation use optical fiber or the light receiving use optical fiber both of which constitute the measurement channel,wherein;
the signal calculation and processing unit further includes a pulse wave calculation unit which calculates an intensity of a pulse wave component due to heartbeats of the subject contained in the hemoglobin signal calculated by the hemoglobin signal calculation unit,the optical fiber setting adequacy evaluation unit evaluates adequacy of setting on the body surface of the subject of the irradiation use optical fiber or the light receiving use optical fiber based on the intensity of the pulse wave component calculated by the pulse wave calculation unit, andthe intensity of the pulse wave component calculated by the pulse wave calculation unit is an intensity at the center frequency among the pulse wave component.
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Accused Products
Abstract
An optical fiber setting adequacy evaluation unit is disclosed for evaluating a setting adequacy on a body surface in an inspection area of irradiation use optical fibers. The evaluation unit can also be used for setting the accuracy of light receiving use optical fibers at both ends of respective measurement channels in an optical measurement apparatus for living body. The evaluation unit evaluates the setting adequacy on the body surface of a subject of the irradiation use optical fibers or of light receiving use optical fibers for the respective measurement channels. The evaluation is performed based on pulse wave intensities of the respective measurement channels calculated by a pulse wave calculation unit. The pulse wave calculation unit calculates intensities of the pulse wave due to heartbeats of a subject contained in hemoglobin signals of the respective measurement channels calculated by a hemoglobin signal calculation unit.
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Citations
15 Claims
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1. An optical measurement apparatus for living body comprising:
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a measurement channel including an irradiation use optical fiber which is set at an irradiation position on a body surface in an inspection area of a subject and irradiates an inspection light having a predetermined frequency of from visible to near infrared range and a light receiving use optical fiber which is set at a light receiving portion adjacent the irradiation use optical fiber on the body surface in the inspection area and receives the inspection light irradiated from the adjacent irradiation use optical fiber and penetrated through inside the subject; a light detection unit which detects the amount of inspection light received by the light receiving use optical fiber in an electrical signal; and a signal calculation and processing unit including a hemoglobin signal calculating unit which calculates a hemoglobin signal representing a hemoglobin concentration inside the subject through which the inspection light has penetrated based on the electrical signal detected by the light detection unit and an optical fiber setting adequacy evaluation unit which evaluates adequacy of setting on the body surface in the inspection area of the irradiation use optical fiber or the light receiving use optical fiber both of which constitute the measurement channel, wherein; the signal calculation and processing unit further includes a pulse wave calculation unit which calculates an intensity of a pulse wave component due to heartbeats of the subject contained in the hemoglobin signal calculated by the hemoglobin signal calculation unit, the optical fiber setting adequacy evaluation unit evaluates adequacy of setting on the body surface of the subject of the irradiation use optical fiber or the light receiving use optical fiber based on the intensity of the pulse wave component calculated by the pulse wave calculation unit, and the intensity of the pulse wave component calculated by the pulse wave calculation unit is an intensity at the center frequency among the pulse wave component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical measurement apparatus for living body comprising:
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a measurement channel including an irradiation use optical fiber which is set at an irradiation position on a body surface in an inspection area of a subject and irradiates an inspection light having a predetermined frequency of from visible to near infrared range and a light receiving use optical fiber which is set at a light receiving portion adjacent the irradiation use optical fiber on the body surface in the inspection area and receives the inspection light irradiated from the adjacent irradiation use optical fiber and penetrated through inside the subject; a light detection unit which detects the amount of inspection light received by the light receiving use optical fiber in an electrical signal; and a signal calculation and processing unit including a hemoglobin signal calculating unit which calculates a hemoglobin signal representing a hemoglobin concentration inside the subject through which the inspection light has penetrated based on the electrical signal detected by the light detection unit and an optical fiber setting adequacy evaluation unit which evaluates adequacy of setting on the body surface in the inspection area of the irradiation use optical fiber or the light receiving use optical fiber both of which constitute the measurement channel, wherein; the signal calculation and processing unit further includes a pulse wave calculation unit which calculates an intensity of a pulse wave component due to heartbeats of the subject contained in the hemoglobin signal calculated by the hemoglobin signal calculation unit, the optical fiber setting adequacy evaluation unit evaluates adequacy of setting on the body surface of the subject of the irradiation use optical fiber or the light receiving use optical fiber based on the intensity of the pulse wave component calculated by the pulse wave calculation unit, the intensity of the pulse wave component calculated by the pulse wave calculation unit is fourth order statistics around the center frequency among the pulse wave component.
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12. A method of optical measurement for living body comprising:
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(1) step of irradiating inspection light having a predetermined wavelength of from visible to near infrared range with an irradiation use optical fiber set at an irradiation position on a body surface in an inspection area of a subject; (2) step of receiving the inspection light which is irradiated from the adjacent irradiation use optical fiber and penetrated through inside the subject with a light receiving use optical fiber at a light receiving position adjacent the irradiation use optical fiber on the body surface in the inspection area; (3) step of detecting the amount of the inspection light received by the light receiving use optical fiber in a form of electrical signal; (4) step of calculating a hemoglobin signal representing hemoglobin concentration inside the subject through which the inspection light has penetrated based on the detected electrical signal; and (5) step of evaluating setting adequacy on the body surface in the inspection area of the irradiation use optical fiber or the light receiving use optical fiber, wherein the step (5) includes; (6) step of calculating an intensity of a pulse wave component due to heartbeats of the subject contained in the hemoglobin signal calculated in the step (4), and (7) step of evaluating a setting adequacy on the body surface of the subject of the irradiation use optical fiber or the light receiving use optical fiber based on the intensity of the pulse wave component calculated in the step (6), and wherein the intensity of the pulse wave component calculated in the step (6) is an intensity at the center frequency among the pulse wave component. - View Dependent Claims (13, 14, 15)
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Specification