Radiation emitting device with moveable aperture plate
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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Abstract
In a radiation emitting device, particularly in a radiation therapy device, isodose curves are adjusted both by a moveable plate that is controlled during irradiation and by varying the dose rate of the radiation beam during irradiation. By superimposing the effects of moving the plate and varying the dose rate of the radiation beam, it is possible to vary the isodose curve in the object of irradiation, so that a wide range of variation in the possible isodose curves is obtained. If the plate is moved at a constant speed, e.g. various wedge-shaped isodose curves can be easily achieved.
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5 Claims
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1. A radiation emitting device for irradiating an object with a radiation beam, said radiation emitting device comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification