title: Small-angle multiple scattering and spatial resolution in charged particle tomography.
abstract: The formulae for the RMS scattering angle given by small-angle multiple-scattering theory are discussed and a correction to the standard Rossi formula is derived. Values of the correction factor are calculated for protons, alpha-particles and heavy ions; these results show that the correction is important for protons and alpha-particles but negligible for heavy ions with mass number 12-40. The values of the RMS scattering angle and the RMS lateral displacement are calculated for a proton beam passing through water. For protons the correction for energy loss in thick targets is even more important.
mesh_terms: D000512:Alpha Particles; D007477:Ions; D011522:Protons; D012542:Scattering, Radiation; D013679:Technology, Radiologic; D014055:Tomography, Emission-Computed
chemical_list: D007477:Ions; D011522:Protons