Patent ID: 7672435
Filing Date: 2010-03-02
Classification: A61N,G21K

Abstract:
1. A radiation therapy apparatus comprising: a multi-leaf collimator device having a pair of collimator components which respectively include a plurality of leaves arranged close to one another such that the leaves face one another across an irradiation axis, and configured to set a desired irradiation field by individually moving the leaves; a driving gear engaged with a gear tooth of the each leaf, respectively; a torque wire connected to a shaft center of the driving gear, respectively; a driving unit configured to drive the driving gears through the torque wire; a plurality of patterned leaves obtained by forming a predetermined pattern in the leaves in a moving direction along its moving path; and a moving amount detecting unit configured to detect a moving amount of the each patterned leaf respectively, by obtaining a plurality of positions of the each patterned leaf based on the pattern.