Evaluation of Imaging Dose From Different Image Guided Systems During Head and Neck Radiotherapy: A Phantom Study.
Radiat Prot Dosimetry
; 175(3): 357-362, 2017 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-27940494
ABSTRACT
This work evaluated and compared the absorbed doses to selected organs in the head and neck region from the three image guided radiotherapy systems cone-beam computed tomography (CBCT) and kilovoltage (kV) planar imaging using the On-board Imager® (OBI) as well as the ExacTrac® X-ray system, all available on the Varian Novalis TX linear accelerator. The head and neck region of an anthropomorphic phantom was used to simulate patients' head within the imaging field. Nanodots optically stimulated luminescent dosemeters were positioned at selected sites to measure the absorbed doses. CBCT was found to be delivering the highest dose to internal organs while OBI-2D gave the highest doses to the eye lenses. The setting of half-rotation in CBCT effectively reduces the dose to the eye lenses. Daily high-quality CBCT verification was found to increase the secondary cancer risk by 0.79%.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imagens de Fantasmas
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Tomografia Computadorizada de Feixe Cônico
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Neoplasias de Cabeça e Pescoço
Limite:
Humans
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article