Abstract
Clinical trials of pion radiotherapy are being conducted at the Clinton P. Anderson Meson Physics Facility (LAMPF) in Los Alamos. For pion treatment planning, computerized tomography (CT) is used for three-dimensional localization of tumor and critical normal structures and for corrections for tissue inhomogeneities. Techniques that make anatomical information on CT scans directly transferable to therapy planning are described, as well as a technique for taking simulation and verification portal films using orthodiagraphic projection. Several requirements for direct use of CT scans in pion treatment planning are discussed. Finally, the effects of patient positioning on organ and tumor mobility and tissue inhomogeneity as shown by CT images are demonstrated.
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