Measurement of radiotherapy superficial X-ray dose under eye shields with radiochromic film.
Phys Med
; 24(1): 29-33, 2008 Mar.
Article
em En
| MEDLINE
| ID: mdl-18162428
ABSTRACT
Accurate measurement and knowledge of dose delivered under eye shield during superficial X-ray radiotherapy is required for patient peripheral dose assessment. Critical structures can include the cornea, lens and retina. Measurement of dose under eye shields has been historically performed with Thermoluminescent Dosimeters (TLD's) due to their small size and design. Restrictions include the energy dependence and the fact that they only provide a point dose assessment. This note investigates the use of a low energy dependence radiochromic thin film for measurement of dose under eye shields in a phantom and compares results to theoretical calculation of dose. Results have shown a good match between predicted and experimentally measured results at the centre of an eye shield irradiated with 50kVp and 150kVp beams. The added advantage of radiochromic film compared to TLD measurements is the two dimensional dose map which is recorded for the assessment of dose providing not only an assessment at the site of the cornea, lens and retina in a phantom but in other areas as well. Radiochromic film has been found to accurately measure dose under eye shield in phantom treatments.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteção Radiológica
/
Radioterapia
/
Dispositivos de Proteção dos Olhos
/
Dosimetria Fotográfica
Tipo de estudo:
Evaluation_studies
/
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Phys Med
Assunto da revista:
BIOFISICA
/
BIOLOGIA
/
MEDICINA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Hong Kong