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Dosimetry of Large Field Valencia applicators for Cobalt-60-based brachytherapy.
Píriz, Gustavo H; Gonzalez-Sprinberg, Gabriel A; Ballester, Facundo; Vijande, Javier.
Afiliação
  • Píriz GH; Medical Physics Unit, Faculty of Sciences, University of the Republic, Montevideo, Uruguay.
  • Gonzalez-Sprinberg GA; Medical Physics Unit, Faculty of Sciences, University of the Republic, Montevideo, Uruguay.
  • Ballester F; Departamento de Física Atómica, Molecular y Nuclear, Universitat de Valencia (UV), Burjassot, Spain.
  • Vijande J; Unidad Mixta de Investigación en Radiofísica e Instrumentación Nuclear en Medicina (IRIMED), Ins-tituto de Investigación Sanitaria La Fe (IIS-La Fe), Universitat de Valencia (UV), València, Spain.
Med Phys ; 51(7): 5094-5098, 2024 Jul.
Article em En | MEDLINE | ID: mdl-38507246
ABSTRACT

BACKGROUND:

Non-melanoma skin cancer is one of the most common types of cancer and one of the main approaches is brachytherapy. For small lesions, the treatment of this cancer with brachytherapy can be done with two commercial applicators, one of these is the Large Field Valencia Applicators (LFVA).

PURPOSE:

The aim of this study is to test the capabilities of the LFVA to use clinically 60Co sources instead of the 192Ir ones. This study was designed for the same dwell positions and weights for both sources.

METHODS:

The Penelope Monte Carlo code was used to evaluate dose distribution in a water phantom when a 60Co source is considered. The LFVA design and the optimized dwell weights reported for the case of 192Ir are maintained with the only exception of the dwell weight of the central position, that was increased. 2D dose distributions, field flatness, symmetry and the leakage dose distribution around the applicator were calculated.

RESULTS:

When comparing the dose distributions of both sources, field flatness and symmetry remain unchanged. The only evident difference is an increase of the penumbra regions for all depths when using the 60Co source. Regarding leakage, the maximum dose within the air volume surrounding the applicator is in the order of 20% of the prescription dose for the 60Co source, but it decreases to less than 5% at about 1 cm distance.

CONCLUSIONS:

Flatness and symmetry remains unaltered as compared with 192Ir sources, while an increase in leakage has been observed. This proves the feasibility of using the LFVA in a larger range of clinical applications.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Radiometria / Dosagem Radioterapêutica / Braquiterapia / Método de Monte Carlo / Radioisótopos de Cobalto Limite: Humans Idioma: En Revista: Med Phys Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Uruguai País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Radiometria / Dosagem Radioterapêutica / Braquiterapia / Método de Monte Carlo / Radioisótopos de Cobalto Limite: Humans Idioma: En Revista: Med Phys Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Uruguai País de publicação: Estados Unidos