Patent Number: 053430484
Section: abstract

A contour collimator for shaping a radiation beam for radiation therapy has two sets of radiation-impermeable lamellae disposed opposite each other, with each lamella being individually displaceable toward and away from its counterpart lamella in the other set. The sets of lamella are disposed between lateral walls of holder, at least one of which can be loosened and tightened. The lamellae are normally urged against each other by a spring force acting on each lamella. A user-manipulable mechanism is operable for displacing all of the lamellae in both sets away from each other, so that a form conforming to the desired contour can be placed between the lamellae. The mechanism is then moved to permit the spring force to act on each lamella, causing the lamellae to abut the form. The lamellae are then clamped in position.