IAEA/WHO postal dosimetry audit methodology for electron beams using radio photoluminescent dosimeters.
Med Phys
; 50(11): 7214-7221, 2023 Nov.
Article
en En
| MEDLINE
| ID: mdl-37793099
ABSTRACT
BACKGROUND:
Independent dosimetry audits are an important intervention in radiotherapy for quality assurance. Electron beams, used for superficial radiotherapy treatments, must also be tested in dosimetry audits as part of a good quality assurance program to help prevent clinical errors.PURPOSE:
To establish a new service for IAEA/WHO postal dosimetry audits in electron beams using RPL dosimeters.METHODS:
A novel postal audit methodology employing a PMMA holder system for RPLDs was developed. The associated correction factors including holder dependence, energy dependence, dose response non-linearity, and fading were obtained and tested in a multi-center (n = 12) pilot study. A measurement uncertainty budget was estimated and employed in analyzing the irradiated dosimeters.RESULTS:
Holder and energy correction factors ranged from 1.004 to 1.010 and 1.019 to 1.059 respectively across the energy range. The non-linearity and fading correction models used for photon beams were tested in electron beams and did not significantly increase measurement uncertainty. The mean dose ratio ± SD of the multi-center study was 1.001 ± 0.011. The overall uncertainty budget was estimated as ± 1.42% (k = 1).CONCLUSIONS:
A methodology for IAEA/WHO postal dosimetry audits in electron beams was developed and validated in a multi-center study and is now made available to radiotherapy centers as a routine service.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Electrones
/
Dosímetros de Radiación
Tipo de estudio:
Clinical_trials
/
Prognostic_studies
Idioma:
En
Revista:
Med Phys
Año:
2023
Tipo del documento:
Article
País de afiliación:
Austria