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Tomographic apparatus including means to illuminate the bounded field of view from a plurality of directions

  • US 4,899,283 A
  • Filed: 11/23/1987
  • Issued: 02/06/1990
  • Est. Priority Date: 11/23/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus useful in producing a tomographic image of a selected slice of an object to be examined, said apparatus comprising:

  • a source of penetrating radiation,sweep means for forming energy from said source into a pencil beam and for repeatedly sweeping said pencil beam over a line in space to define a sweep plane,means for supporting said object to be examined so that said pencil beam intersects said object along a path passing through said object and said selected slice,line collimating means for filtering radiation scattered by said object, said line collimating means having a field of view which intersects said sweep plane in a bounded line so that said line collimating means passes only radiation scattered by elementary volumes of said object lying along said bounded line,positioning means for repositioning said object so that a linear segment of said selected slice of said object is illuminated by said sweeping pencil beam from a plurality of different directions,radiation detector means responsive to radiation passed by said line collimating means for generating at least a different signal sequence for each of said different directions of illumination of said linear segment of said selected slice of said object, andprocessing means responsive to said signal sequences for producing a line image component of a tomographic image.

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