A High-Granularity Digital Tracking Calorimeter Optimized for Proton CT

by Ákos Sudár (BME - Wigner RCP)

Monday 12 Oct 2020, 11:00 → 12:00 Europe/Zurich

Wigner-ELTE-Atomki

A proton CT (pCT) detector comprises a tracking system and an energy/range detector to measure the position and the residual range of the protons. The Bergen pCT collaboration was established to design and build a prototype pCT scanner with a high granularity digital tracking calorimeter (DTC) used as both tracking and energy/range detector. The DTC is made of 41 detector/absorber sandwich layers, and 2 additional detector layers used as tracking system. Each sensitive layer consists of 108 ALPIDE chip sensors (developed for ALICE, CERN) bonded on a polyimide flex and subsequently bonded to a larger flexible printed circuit board. Beam tests proved the ALPIDE response independent of occupancy and proportional to the particle energy deposition at clinically relevant (50-220 MeV/u) energy range, making the distinction of different ion tracks possible. For the reconstructed images in the modelled MC simulation, the relative stopping power accuracy is better than 0.4%, and the data acquisition is fast enough to be used in a clinical environment. Thanks to its ability to detect different types of radiation and its specific design, the pCT scanner can be employed also for additional online applications during the treatment.
 

Sudar_Akos_12102020.pdf