A Proton Computed Tomography Demonstrator for Stopping Power Measurements

Particle therapy is an established method to treat deep-seated tumours using accelerator-produced ion beams. For treatment planning, the precise knowledge of relative stopping power (RSP) within patient vital. Conversion errors from x-ray computed tomography (CT) measurements RSP introduce uncertainties in applied dose distribution. Using a proton (pCT) system measure SP directly could potentially increase accuracy planning. A pCT demonstrator, consisting double-sided silicon strip detectors (DSSD) as tracker and plastic scintillator slabs coupled photomultipliers (SiPM) range telescope, was developed. After significant hardware upgrade 3D tomogram aluminium stair phantom recorded at MedAustron facility Wiener Neustadt, Austria. In total, 80 projections with 6.5 × 10 5 primary events were acquired used for reconstruction distribution phantom. applying straight-line approximation particle path inside phantom, most probable value (MPV) be measured 0.59%. The resolution only 9.3% due limited amount per projection.