Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1983-08-02
1984-11-06
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1124
Patent
active
044809204
ABSTRACT:
Method and apparatus for producing a fringe pattern corresponding to height and depth gradients of an illuminated object with the fringe pattern lines used to define edges of stacked sheets provided as a filter for X-ray dosage tailoring. A camera is provided to produce the fringe pattern on a photographic film using a compact arrangement of light sources, lenses and gratings all within a convenient housing facilitating use yet at the same time providing sufficient resolution through separation of projection and imaging optics. A laser range finder is additionally provided to insure placement of the object to be X-rayed, typically a portion of the human torso, at a standard distance so that the ultimately produced X-ray filter will be properly sized. The filter is produced by cutting a set of lead sheets with edges corresponding to each of the separate contour lines in the exposed and developed film receiving the fringe pattern. Projection techniques are employed in order to size the film record of fringe patterns to a size appropriate for use as an X-ray filter, typically less than life size.
REFERENCES:
patent: 2759814 (1956-08-01), Kegeles
patent: 3614237 (1971-10-01), Kyle et al.
Fujita et al., "Moire Topographic Technique Applied to Design of Compensator for Telecobalt Therapy", Japanese Medical Radiology Academy Magazine, vol. 34, No. 6, (Jun. 25, 1974), pp. 416-417.
Keck et al., "Moire-Topographische Verfahren in der Medizin: Anwendung in der Strahlentherapie", Optik, 46, (1976), No. 4, 431-437.
Xenofos et al., "Theoretical Aspects and Practical Applications of Moire Topography", Phys. Med. Biol., 1979, vol. 24, No. 2, 250-261.
Boyer Arthur L.
Goitein Michael
Rosenberger R. A.
The Massachusetts General Hospital Corporation
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