Method and apparatus suitable for ocular blood flow analysis
First Claim
1. A film analysis system for determining the optical density of an image on successive film frames at the same preselected image sites, the image position on the frames being subject to change from frame to frame, the system comprising:
- a film carrier;
a sensing optical system for illuminating a film on the carrier and for projecting the light from an illuminated point onto a photodetector;
drive means for providing relative movement between the sensing optical system and the film carrier to illuminate selected points on the film; and
drive control means, including a control data memory, for controlling automatic relative movement of the sensing optical system and the film carrier from an initial film position to subsequent positions in accordance with stored position control data to successively illuminate preselected image sites.
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Abstract
Glaucoma and other diseases may be detected by the analysis of angiograms to determine ocular blood flow. Using rapid sequence photography an ocular image is recorded on successive film frames. To determine the optical density of the film at selected image sites, the image position on the frames being subject to change from frame to frame, each frame is initially positioned manually at a starting position relative to a density sensing system. Then, X-Y stepping motors move the film under control of a digital processor to position the film frame at each selected image site. A detector is insensitive to light from a viewing optical system because of a filter included in that system. A crosshair image-point indicator is included on a filter in the viewing system.
61 Citations
17 Claims
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1. A film analysis system for determining the optical density of an image on successive film frames at the same preselected image sites, the image position on the frames being subject to change from frame to frame, the system comprising:
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a film carrier; a sensing optical system for illuminating a film on the carrier and for projecting the light from an illuminated point onto a photodetector; drive means for providing relative movement between the sensing optical system and the film carrier to illuminate selected points on the film; and drive control means, including a control data memory, for controlling automatic relative movement of the sensing optical system and the film carrier from an initial film position to subsequent positions in accordance with stored position control data to successively illuminate preselected image sites. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11)
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9. A film analysis system for viewing an image on a film while determining the optical density of an image point comprising:
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a detector for detecting a passband of light frequencies; a viewer for viewing the image on the film; a sensing optical system for illuminating the image point on the film and for directing the point illuminating light from the image point to the detector; a viewer optical system for illuminating the image on the film and for directing the image illuminating light from the film to the viewer, the viewer optical system including an optical filter ahead of the film for filtering a stopband of frequencies from the image illuminating light, the stopband coinciding with the detector passband.
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12. A method of determining the optical density of a recorded image at preselected image sites for successive instants in time comprising:
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providing a plurality of image frames, each taken as a known instant in time; positioning each image frame relative to a density sensing system at a predetermined starting position of the image; moving each image frame and the density sensing system relative to each other under electronic control to predetermined image sites in accordance with stored position control data; and sensing the image density at each image site. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification