G - Physics – 02 – B
Patent
G - Physics
02
B
88/0.1
G02B 1/00 (2006.01) G02B 5/00 (2006.01) G02B 27/42 (2006.01)
Patent
CA 1145168
A B S T R A C T 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.
382512
Boyer Arthur L.
Goitein Michael
Massachusetts General Hospital (the)
R. William Wray & Associates
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