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Experimental evaluation of analytical penumbra calculation model for wobbled beams
Author(s) -
Kohno Ryosuke,
Kanematsu Nobuyuki,
Yusa Ken,
Kanai Tatsuaki
Publication year - 2004
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1707727
Subject(s) - penumbra , multileaf collimator , optics , carbon ion radiotherapy , aperture (computer memory) , collimator , dosimetry , physics , radiation treatment planning , beam (structure) , nuclear medicine , radiation therapy , linear particle accelerator , medicine , acoustics , radiology , ischemia , cardiology
The goal of radiotherapy is not only to apply a high radiation dose to a tumor, but also to avoid side effects in the surrounding healthy tissue. Therefore, it is important for carbon‐ion treatment planning to calculate accurately the effects of the lateral penumbra. In this article, for wobbled beams under various irradiation conditions, we focus on the lateral penumbras at several aperture positions of one side leaf of the multileaf collimator. The penumbras predicted by an analytical penumbra calculation model were compared with the measured results. The results calculated by the model for various conditions agreed well with the experimental ones. In conclusion, we found that the analytical penumbra calculation model could predict accurately the measured results for wobbled beams and it was useful for carbon‐ion treatment planning to apply the model.