Scattered radiation from dental metallic crowns in head and neck radiotherapy.
Phys Med Biol
; 56(17): 5525-34, 2011 Sep 07.
Article
em En
| MEDLINE
| ID: mdl-21813962
ABSTRACT
We aimed to estimate the scattered radiation from dental metallic crowns during head and neck radiotherapy by irradiating a jaw phantom with external photon beams. The phantom was composed of a dental metallic plate and hydroxyapatite embedded in polymethyl methacrylate. We used radiochromic film measurement and Monte Carlo simulation to calculate the radiation dose and dose distribution inside the phantom. To estimate dose variations in scattered radiation under different clinical situations, we altered the incident energy, field size, plate thickness, plate depth and plate material. The simulation results indicated that the dose at the incident side of the metallic dental plate was approximately 140% of that without the plate. The differences between dose distributions calculated with the radiation treatment-planning system (TPS) algorithms and the data simulation, except around the dental metallic plate, were 3% for a 4 MV photon beam. Therefore, we should carefully consider the dose distribution around dental metallic crowns determined by a TPS.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Espalhamento de Radiação
/
Planejamento da Radioterapia Assistida por Computador
/
Carcinoma de Células Escamosas
/
Método de Monte Carlo
/
Coroas
/
Neoplasias de Cabeça e Pescoço
/
Metais
Tipo de estudo:
Diagnostic_studies
/
Health_economic_evaluation
Limite:
Humans
Idioma:
En
Revista:
Phys Med Biol
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Japão