title: Accelerated helium-ion beams for radiotherapy and stereotactic radiosurgery.
abstract: A new beam line for radiotherapy and radiosurgery with accelerated helium-ion beams has been set up at the Bevalac. The new treatment room has been equipped with a very precise patient positioner in order to utilize the superior dose localization properties of light-ion beams. The beam spreading and shaping system is described, the trade-offs involved in positioning the beam modifying devices are discussed, and the physical properties of the generated radiation fields are reported. The Bragg peak modulation by axial beam stacking employing a variable range shifter is explained and the control system including beam monitoring and dosimetry is presented.
authors.affiliation: Lawrence Berkeley Laboratory, University of California, Berkeley 94720.
authors.forename: B A
authors.initials: BA
authors.lastname: Ludewigt
authors.forename: W T
authors.initials: WT
authors.lastname: Chu
authors.forename: M H
authors.initials: MH
authors.lastname: Phillips
authors.forename: T R
authors.initials: TR
authors.lastname: Renner
mesh_terms: D006371:Helium; D006801:Humans; D007477:Ions; D010315:Particle Accelerators; D011882:Radiotherapy, High-Energy; D013238:Stereotaxic Techniques
chemical_list: D007477:Ions; D006371:Helium