The implementation of in vivo dosimetry in a small radiotherapy department.
Radiother Oncol
; 47(1): 45-8, 1998 Apr.
Article
en En
| MEDLINE
| ID: mdl-9632291
ABSTRACT
PURPOSE:
In vivo dosimetry has been shown in a number of evaluation studies, generally carried out in larger academic centres, to be a reliable method of checking the overall treatment accuracy. The object of this study was to investigate whether it was possible and useful to perform in vivo dosimetry in a small radiotherapy department and to detect if there were any systematic errors in the overall treatment set-up. MATERIALS ANDMETHODS:
All patients were treated on a cobalt-60 unit equipped with a verification system. Six hundred fifty entrance dose measurements were performed with silicon diodes.RESULTS:
The analysis showed a mean deviation of -1.3%. This negative deviation was mainly due to the mean deviation obtained in the treatment of head and neck (-1.6%) or breast (-2.5%) cancer patients. The results for pelvic or lung irradiation showed almost no deviation (-0.8 to 0.43%). Further investigation showed that the negative values for head and neck or breast irradiation were due to the irradiation technique; the lack of scattering material causes a reduction of the dose at the reference point, which is not taken into consideration by the treatment planning system. By performing in vivo dosimetry, we were also able to detect two large errors in 650 measurements and could prevent erroneous treatment.CONCLUSION:
Even when the overall treatment set-up is very accurate, in vivo dosimetry is very useful in a small department since only a small effort can detect and prevent errors.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Servicio de Radiología en Hospital
/
Radioterapia
/
Dosificación Radioterapéutica
/
Radioterapia Asistida por Computador
Tipo de estudio:
Observational_studies
/
Sysrev_observational_studies
Aspecto:
Implementation_research
Límite:
Humans
Idioma:
En
Revista:
Radiother Oncol
Año:
1998
Tipo del documento:
Article
País de afiliación:
Bélgica