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:
Feb. 10, 2009
Filed:
Feb. 27, 2007
Fan Yi, Beijing, CN;
Fan Yi, Beijing, CN;
GE Medical Systems Global Technology Company, LLC, Waukesha, WI (US);
Abstract
The present invention is intended to provide a collimator control method that does not cause blades to get stuck. In a homing phase, blades are positioned based on a blade sense signal sent from a sensor. If the sensor has not sensed the blades but the rotational velocity of a motor has decreased to fall below a predetermined velocity, control states are switched. In a working phase, when an overshoot made by the blades returning to zero positions exceeds a predetermined limit, the control states are switched. Moreover, the rotating direction of the motor is reversed in order to withdraw the blades. Moreover, a collimator is reset to the control state based on tentative zero positions or the control state based on the sense signal sent from the sensor according to whether the sensor has failed.