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Implications of Computed Tomography for Inhomogeneity Corrections in Photon Beam Dose Calculations
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1977
Year
Computed TomographySurgeryTreatment VerificationRadiotherapy PlanningElectron Density AccuracyCt ScanRadiation Therapy PlanningRadiation OncologyNuclear MedicineRadiologyHealth SciencesAdaptive RadiotherapyMedical ImagingRadiation TherapyInhomogeneity CorrectionsPatient Inhomogeneity InformationDosimetryBiomedical ImagingRadiation DoseMedicine
Patient inhomogeneity information is investigated for use in radiotherapy planning. Absorbed doses measured in a phantom are compared to doses calculated for photon beams using various treatment planning inhomogeneity correction methods. Delineation of inhomogeneities with a spatial resolution of 5 mm and with an electron density accuracy of 2% in usually sufficient to allow doses to be calculated with a mean accuracy of better than 2% for 60Co and 3% for 25-MV x rays if the authors' Equivalent Tissue-Air Ratio Method is used.