title: Small photon beam measurements using radiochromic film and Monte Carlo simulations in a water phantom.
abstract: This work reports the use of both GafChromic EBT film immersed in a water phantom and Monte Carlo (MC) simulations for small photon beam stereotactic radiosurgery dosimetry. Circularly collimated photon beams with diameters in the 4-20 mm range of a dedicated 6 MV linear accelerator (Novalis, BrainLAB, Germany) were used to perform off-axis ratios, tissue maximum ratios and total scatter factors measurements, and MC simulations. GafChromic EBT film data show an excellent agreement with MC results (<2.7%) for all measured quantities.
authors.affiliation: Laboratorio de Física Médica, Instituto Nacional de Neurología y Neurocirugía, Tlalpan, Mexico City, Mexico.
authors.forename: Olivia A
authors.initials: OA
authors.lastname: García-Garduño
authors.forename: José M
authors.initials: JM
authors.lastname: Lárraga-Gutiérrez
authors.forename: Mercedes
authors.initials: M
authors.lastname: Rodríguez-Villafuerte
authors.forename: Arnulfo
authors.initials: A
authors.lastname: Martínez-Dávalos
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Celis
mesh_terms: D005373:Film Dosimetry / Q000379:methods; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D017785:Photons; D011874:Radiometry / Q000379:methods*; D014867:Water
chemical_list: D014867:Water