Proton computed tomography images with algebraic reconstruction

A prototype of proton Computed Tomography (pCT) system for hadron-therapy has been manufacturedand tested in a 175 MeV proton beam with a non-homogeneous phantom designed to simulate high-contrast material. BI-SART reconstruction algorithms have been implemented with GPU parallelism,taking into account of most likely paths of protons in matter. Reconstructed tomography images withdensity resolutions r.m.s. down to1% and spatial resolutionso1 mm, achieved within processingtimes of15′for a 512512 pixels image prove that this technique will be beneficial if used instead ofX-CT in hadron-therapy.