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:
Dec. 25, 2007
Filed:
Jun. 23, 2005
Per Carlsson, Stockholm, SE;
Lars Hedin, Hallstahammar, SE;
Per Carlsson, Stockholm, SE;
Lars Hedin, Hallstahammar, SE;
Elekta AB (publ), Stockholm, SE;
Abstract
Calibration of a radiation therapy system comprising a radiation unit with a fixed focus point, a fixation unit for fixing a treatment volume in a patient, and a positioning system. The positioning system comprises a fixed framework, a movable carriage for carrying and moving the entire patient, motor(s), a control system for controlling the motor(s), and at least one engagement point for releasably mounting the fixation unit in fixed engagement with the positioning system. A fixation unit coordinate system defined in relation to the fixation unit is provided. Linearity errors for the motional axes of the carriage and the angular offset between the motional axes and the coordinate system is determined, whereby the relationships between the axes of the coordinate system and the motional axes of the positioning system are determined. The positioning system is then mounted in fixed relationship with the radiation therapy unit and the focus point in relation to the positioning system is determined, whereby the relationship between the focus point and the coordinate system is also determined.