Collimator control method and apparatus, and radiography system

Details Collimator control method and apparatus, and radiography system Collimator control method and apparatus, and radiography system

2007-02-27

2009-02-10

Song, Hoon (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Collimator

C378S145000

Reexamination Certificate

active

07489765

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.

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Zou, et al., “Design and Implementation of A DMLC Control System”, Proc. Intl. Conf. Comm., Circuits and Systems, May 2005, p. 1181-1185.

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