title: Proton penetration and control in nonhomogeneous phantoms.
abstract: Accurate bolus is needed for extension of Bragg-peak therapy. Proton beam-stopping profiles in a lucite-styrofoam-tissue phantom and in a Rando phantom were recorded photographically. Air volumes caused the largest distortions. Lucite bolus was cut to achieve desired beam-stopping profiles. Verification of bolus effect in situ will be important to control beam penetration within 5 mm.
mesh_terms: D008961:Models, Structural; D011522:Protons; D011882:Radiotherapy, High-Energy
chemical_list: D011522:Protons