| 摘要 |
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.
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