Development of a new 3-dimensional scintillating detector for patient treatment quality control in pencil beam scanning proton therapy

Anne-Marie Frelin (1) , G Daviau (1) , My Hoang Hoa Bui (1) , Cathy Fontbonne (2) , Jean-Marc Fontbonne (2) , Dorothée Lebhertz (2) , Erwan Mainguy (1) , Cyril Moignier (2) , Anthony Vela (2) , Juliette Thariat (2)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 LPCC - Laboratoire de physique corpusculaire de Caen

In this work, we developed a three-dimensional (3D) scintillation system, whose fast response and high sensitivity allow the measurement of pencil beam (PB) characteristics (position, energy and intensity in terms of monitor units - MU) for pencil beam scanning proton therapy. The system consists of a 10 × 10 × 10 cm$^{3}$ scintillator cube that produces visible light when irradiated with PBs. A high-speed camera records the scintillation distribution and a mirror positioned at 45° to the cube allows visualization of two orthogonal faces of the cube. The measurements demonstrated the ability of our system to measure beam characteristics for intensities as low as 2·10$^{−3}$ MU in a single irradiation. Standard deviations of less than 300 μm were found for the X and Y PB positions, of approximately 150 keV for energy and of less than 5·10$^{−3}$ MU for intensity. These measurements were then successfully used to verify the compliance of the PBs delivery with the treatment plan, thus making our system a fast and efficient verification tool.

Domaines: Physique [physics]

Anne-Marie Frelin, G Daviau, My Hoang Hoa Bui, Cathy Fontbonne, Jean-Marc Fontbonne, et al.. Development of a new 3-dimensional scintillating detector for patient treatment quality control in pencil beam scanning proton therapy. 13th International Conference on 3D Dosimetry, Jun 2024, Aarhus, Denmark. pp.012021, ⟨10.1088/1742-6596/2799/1/012021⟩. ⟨hal-04660635⟩