Determination of the penumbra width of Elekta SRS cone collimator for 6 MV FF and 6 MV FFF energies using gradient-based edge detection
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2020
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Radiation Physics and Chemistry
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The dosimetric measurements of small fields of radiation are undertaken with detectors such as: GafchromicTM
films, diodes, diamond detectors and ionization chambers of small volumes. The penumbra width, e.g. the spatial
distance between 80% and 20% dose, is smaller in small fields. This fact increases the curvature and hence the
volume effect in the penumbra region. The accuracy in the penumbra calculation is important at the QA test for
implementation of the cranial Stereotactic Radiosurgery. The objective of this work was to apply a Gradient-
Based Edge Detection plugin to calculate the penumbra of a radiation beam defined with the Elekta SRS Cone
Collimators for beams of 6 MV (Flattening Filter – FF) and 6 MV (Flattening Filter Free – FFF) energies using the
beam profile obtained with GafchromicTM film. The results corroborate those from the literature, and they allow
a quantitative evaluation of the width of dosimetric penumbra by Gradient-Based Edge Detection.
Como referenciar
GROPPO, DANIELA P.; SARAIVA, CRYSTIAN W.C.; CALDAS, LINDA V.E. Determination of the penumbra width of Elekta SRS cone collimator for 6 MV FF and 6 MV FFF energies using gradient-based edge detection. Radiation Physics and Chemistry, v. 167, p. 1-5, 2020. DOI: 10.1016/j.radphyschem.2019.05.009. Disponível em: http://repositorio.ipen.br/handle/123456789/31431. Acesso em: 16 Mar 2025.
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