U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Radiation emitting device with moveable aperture plate

Patent 5148032 Issued on September 15, 1992. Estimated Expiration Date: Icon_subject June 28, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Automatic system for precise collimation of radiation
Patent #: 3947689
Issued on: 03/30/1976
Inventor: Wagner

Electron accelerator with a target exposed to the electron beam
Patent #: 4121109
Issued on: 10/17/1978
Inventor: Taumann ,   et al.

Radiographic system
Patent #: 4137460
Issued on: 01/30/1979
Inventor: Fitzsimmons ,   et al.

X-ray computed tomographic apparatus
Patent #: 4606062
Issued on: 08/12/1986
Inventor: Saito

Beam equalization method and apparatus for a kinestatic charge detector
Patent #: 4831260
Issued on: 05/16/1989
Inventor: DiBianca

Prostaglandin analogues, process for their preparation and pharmaceutical compositions containing them
Patent #: 4935446
Issued on: 06/19/1990
Inventor: Imaki, et al.

Radiation therapy device with moveable aperture plate Patent #: 5019713
Issued on: 05/28/1991
Inventor: Schmidt

Inventor

Assignee

Application

No. 723000 filed on 06/28/1991

US Classes:

250/492.1, IRRADIATION OF OBJECTS OR MATERIAL378/108, Dose regulated378/151Automatic

Examiners

Primary: Berman, Jack I.
Assistant: Nguyen, Hiep T.

Attorney, Agent or Firm

International Class

G21F 005/04

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.

Other References

  • "Automatic Variation of Field Size and Dose Rate in Radiation Therapy", Mantel et al., J. Radiation Oncology Biol. Phys., Jul.-Aug. 1977, vol. 2, No. 7 and 8, pp. 697-704
  • "Wedge-Shaped dose distributions by computer-controlled collimator motion", Kijewski et al., Med. Phys. 5(5), Sep./Oct. 1978, pp. 426-429
  • "Computer-controlled Radiation Therapy", Levene et al., Radiology 129, Dec. 1978, pp. 769-775
  • "Dose Optimization With Computer-Controlled Gantry Rotation, Collimator Motion and Dose Rate Variation", Chin et al., J. Radiation Oncology Biol. Phys., vol. 9, No. 5, May 1983, pp. 723-729
  • "A Primer on Theory and Operation of Linear Accelerators in Radiation Therapy", U.S. Department of Health and Human Services, Rockville, Md., Dec. 1981
  • Medical Physics, vol. 5, No. 5, Sep./Oct. 1978, pp. 426-429, Am. Assoc. Phys. Med.; P. K. Kijewski et al.: "Wedge-shaped dose distributions by computer controlled collimator motion
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