title: Diffusion rates of positron emitters in pion irradiated patients.
mesh_terms: D004058:Diffusion; D004601:Elementary Particles; D006258:Head and Neck Neoplasms / Q000532:radiotherapy; D008175:Lung Neoplasms / Q000532:radiotherapy; D008722:Methods; D008954:Models, Biological; D010190:Pancreatic Neoplasms / Q000532:radiotherapy; D012004:Rectal Neoplasms / Q000532:radiotherapy; D014055:Tomography, Emission-Computed