Patent ID: 8933421
Filing Date: 2015-01-13
Classification: A61N,G21K

Abstract:
1. A particle beam therapy system comprising: an accelerator configured to provide a beam of charged particles, a beam guiding unit configured to feed the beam from the accelerator to a treatment location, whereby the beam guiding unit comprises a rotatable gantry with at least two beam position monitors arranged upstream of the treatment location along a beam path in the gantry and configured to detect at least one of a transverse beam position and a momentum transverse to the beam path, and a control unit configured to communicate with the at least two beam position monitors and the beam guiding unit, to determine deviations of an actual position of the beam from its desired position and to transmit control signals to the beam guiding unit for the adaptation of the beam position based on the deviations, wherein the at least two beam position monitors are arranged on either side of a beam periphery diametric to each other such that the at least one of the transverse beam position and the momentum transverse to the beam path are detected by means of direct interaction with beam particles in a halo region in at least one dimension, and wherein the beam position monitors each include at least two beam position monitoring elements arranged along the side of the beam path such that at least two beam position monitoring elements are arranged on each side of the beam path, each of the beam position monitors registering signals of charged particles that pass through each of the at least two beam position monitoring elements included in that beam position monitor.