Patent ID: 6449340
Filing Date: 2002-09-10
Classification: A61B,G21K

Abstract:
A collimator for shaping a beam of energy emitted from a focal spot of a beam source, the collimator comprising:two elongated parallel plates arranged side by side to define an elongated collimating slit between the plates, wherein at least one of the plates is movably relative to the other plate for varying a width of the collimating slit; and a movable cam operatively arranged with respect to the at least one movable plate such that movement of the cam in a first direction causes the width of the collimating slit to increase, and movement of the cam in a second direction causes the width of the collimating slit to decrease, wherein the at least one movable plate includes a follower contacting a cam surface of the cam, and wherein the cam surface includes steps.