Downstream variable thickness energy selection system for charged particle therapy

Abstract

A variable thickness energy selection system for use in a charged particle therapy system is arranged within the nozzle housing downstream of monitoring systems, such as a dose monitor and spot position monitor. This positions the energy selection system proximal to the patient. The thickness of an absorber within the energy selection system can be varied quickly without requiring the ion beam to be turned off between energy selections, thereby allowing for rapid control of the energy selection of the ion beam. The absorber may include one or more high density solid absorbers, or a high-density liquid absorber contained in a closed fluid dynamic system that includes an enclosure positioned within the beam path and a reservoir positioned outside of the beam path.

Dependencies are inferred from the claim text.