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Evaluation of the material assignment method used by a Monte Carlo treatment planning system
A Isambert1, L Brualla, D Lefkopoulos
1Medical Physics Department, Institut Gustave-Roussy, 39 rue Camille-Desmoulins, Villejuif, France.
Abstract:
An evaluation of the conversion process from Hounsfield units (HU) to material composition in computerised tomography (CT) images, employed by the Monte Carlo based treatment planning system ISOgray (DOSIsoft), is presented. A boundary in the HU for the material conversion between "air" and "lung" materials was determined based on a study using 22 patients. The dosimetric consequence of the new boundary was quantitatively evaluated for a lung patient plan.
