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Descrizione
This contribution presents the development of a 3D online dosimeter based on a plastic scintillating monolithic block, imaged with cameras to reconstruct the three-dimensional dose distribution using a tomographic algorithm. The study primarily relies on simulations to investigate the feasibility and performance of the proposed system.
The simulated detector consists of a 10 cm polyvinyl-toluene-based plastic scintillator block (EJ200, Eljen Technology, Texas) positioned along the beamline to absorb a 9-MeV electron beam. Scintillation light emitted from the detector is captured by three cameras, each coupled to a focusing objective, and positioned along three orthogonal axes to collect the light emitted along directions parallel and orthogonal to the beam axis. A maximum likelihood approach is employed in the reconstruction algorithm to derive 3D dose maps from lateral light projections.
In this contribution, we will present the performance of the detector and the algorithm, validated through simulations of the ElectronFlash LINAC accelerator at the Centro Pisano Flash Radiotherapy (CPFR) in Pisa. Additionally, the potential use of Cerenkov light emitted within a plastic cube as a signal for reconstruction will be briefly discussed.
