Phantom development and implementation for Gamma Knife® dosimetry
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2020
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Radiation Physics and Chemistry
Resumo
Stereotactic radiosurgery is a procedure that primarily treats intracranial lesions to destroy tumour cells that are
inaccessible surgically. Gamma Knife® is a stereotactic radiosurgery unit that can treat brain lesions using 60Co
beams, non-invasively. Fields from Gamma Knife® helmets are considered small, therefore, in order to ensure
accurate dosimetry, detectors for dose measurements have to be carefully chosen. The IAEA TRS 483 code of
practice is a standardized guide for dosimetric procedures and indication of detectors for reference dosimetry of
small fields used in radiotherapy beams. The objective of this work was to assess the implementation of the TRS
483 recommendations for Gamma Knife® dosimetry, using two micro-ionization chambers, Exradin A16 and PTW
Pinpoint 3D 31016. An acrylic phantom with the same dimensions as those provided by Elekta, Gamma Knife’s
manufacturer, was built as an alternative. The phantom was characterized for its implementation for Gamma
Knife® dosimetry and to be used as part of an audit kit by a Secondary Standard Dosimetry Laboratory (SSDL) in
Brazil. Alanine pellets were used as reference detector. Dosimetry results for the acrylic phantom were compared
with the ones obtained in phantoms specified by Elekta, which are made of Acrylonitrile Butadiene Styrene
(ABS) and Solid Water materials. TRS 483 recommended correction factors were used to calculate the absorbed
dose to the water taking into consideration the phantom material. Absorbed dose measurements performed using
the designed acrylic phantom showed results comparable to the ones obtained with commercially available
phantoms. The new phantom is suitable for Gamma Knife reference and relative dosimetry. The results of this
work aim to contribute to the implementation of the TRS 483, mainly in the area of Gamma Knife dosimetry and
the use of small volume ionization chambers.
Como referenciar
COSTA, NATHALIA A.; PATALLO, ILEANA S.; DIMITRIADIS, ALEX; SARAIVA, CRYSTIAN W.C.; POTIENS, MARIA da P.A. Phantom development and implementation for Gamma Knife® dosimetry. Radiation Physics and Chemistry, v. 167, p. 1-5, 2020. DOI: 10.1016/j.radphyschem.2019.108355. Disponível em: http://repositorio.ipen.br/handle/123456789/31439. Acesso em: 15 Jun 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.