Use of a plastic scintillator detector for patient-specific quality assurance of VMAT SRS.
J Appl Clin Med Phys
; 20(9): 143-148, 2019 Sep.
Article
en En
| MEDLINE
| ID: mdl-31538717
ABSTRACT
PURPOSE:
To evaluate a scintillator detector for patient-specific quality assurance of VMAT radiosurgery plans.METHODS:
The detector was comprised of a 1 mm diameter, 1 mm high scintillator coupled to an acrylic optical fiber. Sixty VMAT SRS plans for treatment of single targets having sizes ranging from 3 mm to 30.2 mm equivalent diameter (median 16.3 mm) were selected. The plans were delivered to a 20 cm × 20 cm x 15 cm water equivalent plastic phantom having either the scintillator detector or radiochromic film at the center. Calibration films were obtained for each measurement session. The films were scanned and converted to dose using a 3-channel technique.RESULTS:
The mean difference between scintillator and film was -0.45% (95% confidence interval -0.1% to 0.8%). For target equivalent diameter smaller than the median, the mean difference was 1.1% (95% confidence interval 0.5% to 1.7%). For targets larger than the median, the mean difference was -0.2% (95% confidence interval -0.7% to 0.1%).CONCLUSIONS:
The scintillator detector response is independent of target size for targets as small as 3 mm and is well-suited for patient-specific quality assurance of VMAT SRS plans. Further work is needed to evaluate the accuracy for VMAT plans that treat multiple targets using a single isocenter.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Plásticos
/
Garantía de la Calidad de Atención de Salud
/
Conteo por Cintilación
/
Planificación de la Radioterapia Asistida por Computador
/
Radiocirugia
/
Fantasmas de Imagen
/
Radioterapia de Intensidad Modulada
Tipo de estudio:
Etiology_studies
Límite:
Humans
Idioma:
En
Revista:
J Appl Clin Med Phys
Asunto de la revista:
BIOFISICA
Año:
2019
Tipo del documento:
Article
País de afiliación:
Estados Unidos