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Exact patient positioning by compairing reconstructed x-ray images and linac x-ray images

  • US 6,516,046 B1
  • Filed: 09/22/2000
  • Issued: 02/04/2003
  • Est. Priority Date: 11/04/1999
  • Status: Expired due to Term
First Claim
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1. A method for exact positioning of a patient for radiotherapy or radiotherapy comprising the steps:

  • a) pre-positioning the patient relative to a linear accelerator, b) producing at least one X-ray image of the patient or one of his/her body parts in the vicinity of the radiation treatment target, c) mapping said X-ray image, d) generating at least one reconstructed image from a three-dimensional set of patient scanning data corresponding to said X-ray image, e) superimposing said reconstructed image and said X-ray image, and detecting the positional error electronically or computer-controlled on the basis of special landmarks in both images, and f) correcting the position of the patient on the basis of the detected positional error, and wherein pre-positioning is carried out by means of a computer-controlled and camera-controlled navigation and tracking system with the aid of artificial marker arrangements on the patient and on the treatment devices.

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