Una nueva implementación del análisis multicanal para la dosimetría mediante películas radiocrómicas
- Rodríguez Rodríguez, César
- Martín Martín, Guadalupe
- Bermúdez Luna, Rocío
- López Fernández, Alfonso
- Torres Olombrada, Mª Victoria de
- García Cañibano, Tamara
- Caballero Guerra, Pastora
ISSN: 1576-6632
Ano de publicación: 2014
Volume: 15
Número: 1
Páxinas: 49-54
Tipo: Artigo
Outras publicacións en: Revista de Física Médica
Resumo
The aims of this paper are to carry out a new implementation of the multichannel radiochromic film dosimetry (Micke A, Lewis D, Yu X. Multichannel film dosimetry with nonuniformity correction. Med Phys 2011;38:2523-34), to quantify the variation in gamma index as compared to the single channel film dosimetry, and to determine if the procedure achieves similar results by means of a different scanner that the one used by Micke et al. Radiochromic EBT2 films and a Microtek 9000 XL scanner were used. Our procedure simplifies the system calibration splitting it into two factors, manufactured batch and digitalization specific. Absorbed dose spatial distributions from an open radiotherapy beam without any modulation and 20 IMRT treatments were determined. Their gamma index maps were calculated and a comparison of the results from single channel and multichannel dosimetry was performed. A 5% mean increase in concordance was obtained by using the multichannel film dosimetry. Our results are similar to those reported by Micke et al. even though we are using a different scanner.