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US 2002/0118338 A1Published application
Ophthalmologic apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshimi Kohayakawa
Life of this patent
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Abstract
An ophthalmologic apparatus has a first light source for the measurement of a blood flow velocity by the Doppler shift method, and a second light source which differs in wavelength from the first light source and used for tracking of a blood vessel to be measured. This apparatus can simultaneously obtain a blood oxygen concentration from the difference in reflectance between two light sources from the measurement position on the blood vessel.
Claims9
An ophthalmologic apparatus comprising:
- (1) blood flow velocity detection means including
- first projection means for projecting a first light beam on a fundus,
- first light-receiving means for receiving reflected light of the first light beam, and
- blood flow velocity measurement means for measuring a blood flow velocity on the basis of an output from said first light-receiving means;
- and
- (2) blood oxygen concentration detection means including
- second projection means for projecting a second light beam on the fundus,
- second light-receiving means for receiving reflected light of the second light beam, and
- arithmetic means for computing a blood oxygen concentration by using an output from said first light-receiving means and an output from said second light-receiving means.
6 more elements
An ophthalmologic apparatus comprising:
- (1) blood flow velocity measurement means for measuring a blood flow velocity on the basis of reflected light of a first light beam projected on a blood vessel of a fundus;
- and
- (2) blood oxygen concentration measurement means for measuring a blood oxygen concentration on the basis of the first reflected light beam and reflected light of a second light beam which differs in wavelength from the first light beam.
Dependencies are inferred from the claim text.