The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 1976
Filed:
Mar. 14, 1975
Raymond D McIntyre, Los Altos Hills, CA (US);
Varian Associates, Palo Alto, CA (US);
Abstract
In an x-ray treatment machine a charged particle accelerator or cobalt source is provided for producing a field of high energy x-ray radiation for application to a body, for treatment thereof. The radiation machine includes collimators and field shaping structures for shaping the field of x-ray radiation applied to the body. The high energy x-ray radiation intercepted by the field shaping and collimating structures produces high energy secondary electrons by a number of different atomic processes. These energetic secondaries contaminate the shaped radiation field applied to the body being treated. The contaminating high energy electrons, if not eliminated, substantially increase the dosage of radiation delivered to the surface of the body. However, electron deflecting means, such as magnet structures, are provided for interposing in the electron contaminated field of x-ray radiation, so as to provide an electron deflecting flux for deflecting the contaminating electrons and reducing the dose due to these electrons by spreading them out more uniformly over the treated surface. In addition, an electron absorbing screen is interposed in the secondary electron contaminated radiation field for further absorbing the unwanted high energy secondary electrons.