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Roller-supported, modular, isocentric gantry and method of assembly

  • US 4,917,344 A
  • Filed: 04/07/1988
  • Issued: 04/17/1990
  • Est. Priority Date: 04/07/1988
  • Status: Expired due to Term
First Claim
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1. An earthquake resistant, roller-supported, modular, isocentric gantry for supporting and rotating a radiation beam transport and delivery system on an axis of rotation around a stationary patient so as to precisely deliver a treatment beam to a predetermined target isocenter within the patient and on the axis of rotation from several different angles during patient treatment, the gantry comprising:

  • an inner support structure including vertically extending, parallel and concentric front and rear circular rings separated by axially extending brace members and supported by rollers for rotation on an axis of rotation, the rear ring carrying an entry element of the beam transport and delivery system for turning on the axis of rotation and the front ring or an axially extending brace member carrying means supporting an exit element of the beam transport and delivery system to precisely deliver the treatment beam at the target isocenter on the axis of rotation independent of the rotational position of the inner support structure;

    motor drive means for rotating the inner support structure on the axis of rotation;

    an outer annular segmented truss secured to and circumscribing the inner support structure and carrying intermediate elements of the beam transport and delivery system for turning on the axis of rotation with the inner support structure; and

    means extending between the rear ring and the truss for supporting other intermediate elements of the beam transport and delivery system between the rear ring and the truss.

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