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Comparação de sistemas multidetetores de radiação para controlo de qualidade do acelerador linear Varian Halcyon
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Resumo(s)
A radioterapia desempenha um papel vital na abordagem contemporânea do tratamento
de tumores, fornecendo uma alternativa eficaz e cada vez menos invasiva. No epicentro
deste tratamento, encontram-se os aceleradores lineares médicos, equipamentos capazes
de gerar radiação de alta energia e concebidos para utilização na radioterapia externa.
O acelerador linear (LINAC) Varian Halcyon emerge como uma peça fundamental desta
tecnologia, sendo cada vez mais utilizado pela sua melhor eficiência de fluxo de traba-
lho, sem comprometer a segurança e o conforto do paciente, e, acima de tudo, mantendo
a eficácia do tratamento. Neste contexto, é crucial garantir que a dose de radiação ad-
ministrada corresponde exatamente ao planeamento prévio, assegurando a precisão do
tratamento e minimizando a dose absorvida por tecidos saudáveis. Para este fim, a veri-
ficação constante dos parâmetros do LINAC é essencial, especialmente durante as fases
de instalação e manutenção (commissioning).
O presente trabalho teve como objetivo avaliar as capacidades do sistema de deteção
multidetetor PTW Octavius 4D, em comparação com o Sun Nuclear IC Profiler, no âmbito
dos testes de controlo de qualidade para o Varian Halcyon. Foram realizadas medições
detalhadas do débito de dose ao isocentro e dos perfis de dose com a rotação da gantry,
permitindo a análise da constância dos parâmetros de simetria e unflatness. Adicional-
mente, foi efetuada uma análise gama entre os dois sistemas e comparações com perfis
de dose de referência obtidos através de um fantoma de água.
Os resultados mostram que o PTW Octavius 4D proporciona medições precisas e con-
sistentes, demonstrando maior flexibilidade e eficiência operacional face ao IC Profiler. A
sua utilização na execução de testes de controlo de qualidade revela-se eficaz, reduzindo
o tempo de preparação e simplificando os procedimentos. Estes resultados sugerem que o
Octavius 4D pode ser uma alternativa viável ao fantoma de água em controlos regulares,
especialmente após a manutenção do LINAC.
Radiotherapy plays a vital role in the contemporary approach to cancer treatment, pro- viding an effective and increasingly less invasive alternative. At the core of this treatment are medical linear accelerators, devices capable of generating high-energy radiation and designed for use in external beam radiotherapy. The Varian Halcyon linear accelerator (LINAC) stands out as a key component of this technology, being increasingly used for its improved workflow efficiency without compromising patient safety and comfort, while maintaining treatment effectiveness. In this context, it is crucial to ensure that the admin- istered radiation dose precisely matches the planned dose, ensuring treatment accuracy and minimizing the exposure of healthy tissues. To achieve this, constant verification of LINAC parameters is essential, particularly during installation and maintenance phases (commissioning). This study aims to evaluate the capabilities of the PTW Octavius 4D multidetector system in comparison with the Sun Nuclear IC Profiler, in the context of quality assurance tests for the Varian Halcyon. Detailed measurements of dose rate at the isocenter and dose profiles with gantry rotation were performed, enabling the analysis of parameters such as symmetry and unflatness. Additionally, a gamma analysis was conducted between the two systems and compared with reference dose profiles measured using a water phantom. The results show that the PTW Octavius 4D provides accurate and consistent mea- surements, demonstrating greater flexibility and operational efficiency compared to the IC Profiler. Its use in quality assurance tests proves effective, reducing preparation time and simplifying procedures. These results suggest that the Octavius 4D could be a viable alternative to the water phantom for routine checks, especially after LINAC maintenance.
Radiotherapy plays a vital role in the contemporary approach to cancer treatment, pro- viding an effective and increasingly less invasive alternative. At the core of this treatment are medical linear accelerators, devices capable of generating high-energy radiation and designed for use in external beam radiotherapy. The Varian Halcyon linear accelerator (LINAC) stands out as a key component of this technology, being increasingly used for its improved workflow efficiency without compromising patient safety and comfort, while maintaining treatment effectiveness. In this context, it is crucial to ensure that the admin- istered radiation dose precisely matches the planned dose, ensuring treatment accuracy and minimizing the exposure of healthy tissues. To achieve this, constant verification of LINAC parameters is essential, particularly during installation and maintenance phases (commissioning). This study aims to evaluate the capabilities of the PTW Octavius 4D multidetector system in comparison with the Sun Nuclear IC Profiler, in the context of quality assurance tests for the Varian Halcyon. Detailed measurements of dose rate at the isocenter and dose profiles with gantry rotation were performed, enabling the analysis of parameters such as symmetry and unflatness. Additionally, a gamma analysis was conducted between the two systems and compared with reference dose profiles measured using a water phantom. The results show that the PTW Octavius 4D provides accurate and consistent mea- surements, demonstrating greater flexibility and operational efficiency compared to the IC Profiler. Its use in quality assurance tests proves effective, reducing preparation time and simplifying procedures. These results suggest that the Octavius 4D could be a viable alternative to the water phantom for routine checks, especially after LINAC maintenance.
Descrição
Palavras-chave
Acelerador Linear Controlo de Qualidade Dose de Radiação Intercomparação de sistemas Multidetetores