Use of IAEA's phase-space files for virtual source model implementation: Extension to large fields

CLAUDIA CARLETTI; ALEXIS RUCCI; BOJAN STRBAC; WALTER CRAVERO

PHYSICA MEDICA

IST EDITORIALI POLGRAFICI INT

Año: 2016 vol. 32 p. 1030 - 1033

1120-1797

In a previous work, phase-space data files (phsp) provided by the International Atomic Energy Agency (IAEA) were used to develop a hybrid virtual source model (VSM) for clinical photon beams. Very good agreement with dosimetric measurements performed on linear accelerators was obtained for field sizes up to 15×15cm(2). In the present work we extend the VSM to larger field sizes, for which phsp are not available. We incorporate a virtual flattening filter to our model, which can be determined from dose measurements for larger fields. In this way a fully functional VSM can be built, from publicly available IAEA´s phsps and standard dose measurements, for fields of any size and tailored to a particular linac.