Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-04-12
1978-03-28
Lieberman, Eli
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250445T, 350162SF, 250550, H01J 3912
Patent
active
040816737
ABSTRACT:
An improved apparatus and method for generating the two-dimensional filtered back-projected image of a slice of an object. In accordance with the invention there is provided a photodetector means and illuminating means directed toward the photodetector means. A carrier means is disposed between the illuminating means and the photodetector means, the carrier means having a plurality of substantially parallel elongated projections on the surface thereof. Each projection has an optical characteristic (transmissivity or reflectivity) representing the density characteristic of the slice of the object as measured at a particular relative rotational angle. A mask means is disposed between the illuminating means and the photodetector, the mask means comprising a plurality of cycles of a substantially sinusoidally shaped pattern of varying amplitude. Means are provided for moving the carrier means and the mask means with respect to each other. Finally, a display or recording means, synchronized with the moving means, is responsive to the output of the photodetector for displaying the back-projected image. In the preferred embodiment of the invention the mask means comprises a movable endless loop and the pattern is a substantially sinusoidal transparency whose amplitude varies between zero and a predetermined maximum. In this embodiment, the mask has an optical characteristic transverse the length thereof which corresponds to a predetermined filter function.
REFERENCES:
patent: 2281931 (1942-05-01), Frank
patent: 3216318 (1965-11-01), Gaffard
patent: 3292148 (1966-12-01), Giuliano et al.
patent: 3540797 (1970-11-01), Glenn, Jr.
patent: 3563634 (1971-02-01), Parks et al.
patent: 3768907 (1973-10-01), Williams
Barrett Harrison H.
Swindell William
Lieberman Eli
Moore David K.
Novack Martin
University Patents Inc.
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