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Radiotherapy apparatus with two light beam localizers

  • US 4,256,966 A
  • Filed: 08/24/1979
  • Issued: 03/17/1981
  • Est. Priority Date: 07/03/1979
  • Status: Expired due to Term
First Claim
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1. A radiation emitting apparatus, comprising in combination:

  • (a) a radiation source comprising an electron accelerator being adapted to project a beam of radiation along a central axis onto a surface to be irradiated, said radiation being focused at a focal point;

    (b) a first light-beam localizer for emitting a first plane light fan towards said surface;

    (c) a second light-beam localizer for emitting a second plane light fan towards said surface, said second light fan intersecting the first light fan in an intersecting line which coincides with said central axis, whereby said first and second light fans form an intersection of two light lines on said surface; and

    (d) means associated with said first light-beam localizer for projecting a scale towards said surface along with said first light fan, wherein said scale is provided with numerals which indicate in said intersection the distance between said focal point and said surface.

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