The spatial accuracy of two frameless, linear accelerator-based systems for single-isocenter, multitarget cranial radiosurgery.
J Appl Clin Med Phys
; 18(2): 37-43, 2017 Mar.
Article
en En
| MEDLINE
| ID: mdl-28300379
Single-isocenter, multitarget cranial stereotactic radiosurgery (SRS) is more efficient than using an isocenter for each target, but spatial positioning uncertainties can be magnified at locations away from the isocenter. This study reports on the spatial accuracy of two frameless, linac-based SRS systems for multitarget, single-isocenter SRS as a function of distance from the isocenter. One system uses the ExacTrac platform for image guidance and the other localizes with cone beam computed tomography (CBCT). For each platform, a phantom with 12 target BBs distributed up to 13.8 cm from the isocenter was aligned starting from five different initial offsets and then imaged with the treatment beam at seven different gantry and couch angles. The distribution of the resulting positioning errors demonstrated the value of adding a 1-mm PTV margin for targets up to about 7-8 cm from the isocenter. For distances 10 cm or more, the CBCT-based alignment remained within 1.1 mm while the ExacTrac-based alignment differed by up to 2.2 mm.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Aceleradores de Partículas
/
Planificación de la Radioterapia Asistida por Computador
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Neoplasias Encefálicas
/
Radiocirugia
/
Fantasmas de Imagen
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Cirugía Asistida por Computador
Tipo de estudio:
Guideline
Límite:
Humans
Idioma:
En
Revista:
J Appl Clin Med Phys
Asunto de la revista:
BIOFISICA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos