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Radiation emitting device with moveable aperture plate

  • US 5,148,032 A
  • Filed: 06/28/1991
  • Issued: 09/15/1992
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. A radiation emitting device for irradiating an object with a radiation beam, said radiation emitting device comprising:

  • a radiation source for generating a radiation beam, said source including a pulse generating unit for generating pulses and wherein variation of the pulse repetition frequency of said pulses varies the dose rate of said radiation beam;

    an aperture plate arrangement located in the trajectory of said radiation beam between said radiation source and said object and including a plurality of plates for determining a radiation field at said object;

    a drive control unit coupled to said aperture plate arrangement for moving at least one plate of said plurality of plates at a constant speed;

    a dose rate measuring unit located in the trajectory of said radiation beam for measuring the dose rate of said radiation beam; and

    a dose control unit coupled to said radiation source, said dose rate measuring unit and to said drive control unit for varying the pulse repetition rate of said pulses, and hence the dose rate of said radiation beam during irradiation in correlation with the movement of said plate at constant speed.

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