Abstract
Proton imaging can be seen as a powerful technique for on-line monitoring of ion range during carbon ion therapy irradiation. The protons detection technique uses, as three-dimensional tracking system, a set of CMOS sensor planes. A simulation toolkit based on GEANT4 and ROOT is presented including detector response and reconstruction algorithm.
Highlights
The present paper focuses on proton imaging (IVI method) in the frame of the QAPIVI (Quality Assurance by Protons Vertex Imaging) project
The resolution achieved in longitudinal direction is of 15 mm. This spatial resolution is not the most critical issue of the interaction vertex imaging (IVI) technique; the monitoring mainly relies on the information provided by the fall-off position. It has been shown in ref. [7] that a millimetric precision on the fall-off position of the vertex distribution can be achieved on a pencil-beam basis in homogeneous target
Ion-range monitoring during carbon ion therapy by means of interaction vertex imaging (IVI) with secondary protons was investigated by using planes of MIMOSA26 chips as tracker device
Summary
In this paper the detector simulation, reconstruction algortithms and first results obtained with an homogeneous target will be presented. The IVI (Interaction Vertex Imaging) method uses charged particles produced in the fragmentation of the incident ions to obtain information about the beam range. The principle is to reconstruct trajectories of emitted particles and to extrapolate them to the point of creation, called vertex. In the case of ion carbon therapy, it has been shown that a large number of protons are generated during collision along the primary ion path [10] and the multiplicity of protons was found to be enough to perform ion-range monitoring on a pencil-beam basis operating in active mode in homogeneous targets [7]
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