Diaphragm arrangement for adjustable aperture, especially for er

Details Diaphragm arrangement for adjustable aperture, especially for er Diaphragm arrangement for adjustable aperture, especially for er

1975-06-27

1977-05-31

Smith, Alfred E.

Radiant energy

Radiation controlling means

Shields

250512, G21F 504

Patent

active

040271676

ABSTRACT:
An adjustable diaphragm arrangement, or device, for defining an aperture ch confines a beam of radiation, especially for radiation therapy, in which cup shaped diaphragm elements, the edges of which define the edge of the aperture and which elements are concave toward a common point at or near the source of radiation, are tiltably mounted for simultaneous movement to control the size of the aperture, and may, in addition, be rotatable to vary the orientation of the aperture, all of the aforesaid movements being carried out without change in the axis of the beam of radiation. The parts of the device may be formed of a material which strongly absorbs radiation.

REFERENCES:
patent: 2542196 (1951-02-01), Haupt
patent: 2836729 (1958-05-01), Snarr et al.
patent: 3115580 (1963-12-01), Brewer
patent: 3156824 (1964-11-01), Peyser

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