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Radiation therapy imaging apparatus

  • US 4,995,068 A
  • Filed: 10/02/1989
  • Issued: 02/19/1991
  • Est. Priority Date: 10/02/1989
  • Status: Expired due to Term
First Claim
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1. Radiation therapy imaging apparatus for providing images of a patient being treated on a radiation therapy apparatus for verification and monitoring of patient positioning and verification of alignment and shaping of the radiation field of the radiation therapy apparatus, wherein said radiation therapy apparatus includes a high-energy treatment head for applying a radiation dose to a patient positioned on a treatment table, and a gantry rotatable about an isocentric axis and carrying said treatment head for permitting said radiation dose to be applied to the patient from any of a range of angles about said isocentric axis;

  • the radiation therapy imaging apparatus including a radiation therapy image detector which comprises a video camera mounted on said gantry diametrically opposite said treat head, an elongated light-excluding enclosure enveloping said camera to exclude ambient light from said camera, a fluoroscopic plate positioned on a distal end of said enclosure remote from said camera and aligned with said head to produce a fluoroscopic image in response to radiation applied from said head through said patient, mirror means in said enclosure and oriented for reflecting said image to said camera to permit monitoring on a viewing screen of the positioning of the radiation field in respect to the patient, and means for retracting at least the distal end of said enclosure from a position in which the fluoroscopic plate is disposed opposite the treatment head without disturbing the position of the camera on said gantry, so that said enclosure can be collapsed and kept from projecting under said treatment table when the patient is being positioned on the treatment table.

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