Proton Transmission Radiography -PTR MWPC1 MWPC2 First suggested by Wilson (1946) Images contain residual energy/range information of individual protons Resolution limited by multiple Coulomb scattering Spatial resolution of 1mm possible SC 0
Proton Transmission Radiography - PTR • First suggested by Wilson (1946) • Images contain residual energy/range information of individual protons • Resolution limited by multiple Coulomb scattering • Spatial resolution of 1mm possible MWPC 1 MWPC 2 SC p Energy detector
Comparison of CT Calibration Methods PTR used as a QA tool Comparison of measured and CT-predicted integrated stopping power [%sIoxId Sheep head used as model Stoichiometric calibration (A) better than tissue substitute calibrations (B C) Spcale-Spmeas %
Comparison of CT Calibration Methods • PTR used as a QA tool • Comparison of measured and CT-predicted integrated stopping power • Sheep head used as model • Stoichiometric calibration (A) better than tissue substitute calibrations (B & C) SPcalc - Spmeas [%] No of PTR pixels [%]