High-resolution measurements of small field beams using polymer gels.
Appl Radiat Isot
; 65(10): 1160-4, 2007 Oct.
Article
en En
| MEDLINE
| ID: mdl-17574428
Small field sizes are increasingly becoming important in radiotherapy particularly since the introduction of intensity-modulated radiation therapy (IMRT) techniques. It is normally a challenging task to reliably measure the delivered dose and to determine its distribution in a medium for such small fields using conventional-type dosimeters such as gas ionisation chambers. Recently, attempts have been made to use films, but they are not tissue equivalent, they measure the dose only in two dimensions and they are not as responsive to radiations. In the present work, polyacrylamide gel (PAG) dosimeters are employed to measure the dose and its distribution in three dimensions for very small field sizes, such as those typically used in stereotactic radiosurgery. Field sizes of 6 x 6 and 18 x 18 mm in width are investigated. The results show an agreement with radiochromic film and ionisation diode measurements, with some variation in measured doses near the edge of the field, where the gel data decreases more rapidly than the other methods.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Planificación de la Radioterapia Asistida por Computador
/
Geles
Idioma:
En
Revista:
Appl Radiat Isot
Asunto de la revista:
MEDICINA NUCLEAR
/
SAUDE AMBIENTAL
Año:
2007
Tipo del documento:
Article
País de afiliación:
Australia
Pais de publicación:
Reino Unido