Support arm backscatter and off-axis effects of an electronic portal imaging device (EPID)
are challenging for radiotherapy quality assurance. Aiming at the issue, we proposed a …

Materials and method s. Treatment plans were made for 150 patients treated with the photon
6MV VMAT technique. Three groups of patients were studied: those treated for breast …

Introduction: The aim of this study was to determine whether the EPID detector can serve as
an effective tool for interfractional dose control. Accurate radiotherapy delivery is vital for …

Introduction. The volumetric modulated arc therapy technique (VMAT) is now widely used in
radiotherapy. Verification of the dose delivered to the patient is performed prior to the …

Treatment planning for head and neck cancer is quite complex because of its complicated
shape and configuration, and the position of cancer close to organs-at-risk (OARs) such as …

The gamma analysis metric is a commonly used metric for VMAT plan evaluation. The major
drawback of this is the lack of correlation between gamma passing rates and DVH values …

Aims: Craniospinal irradiation (CSI) is a challenging task on halcyon due to its field size
constraint (28 cm× 28 cm). CSI was planned by volumetric modulated arc therapy (VMAT) …

O presente relatório tem por base o estágio curricular realizado durante quatro meses no
Instituto Português de Oncologia do Porto Francisco Gentil, EPE (IPOP), no serviço de Física …

Electronic Portal Imaging Systems (EPIDs) are used in Radiotherapy treatment as part of the
patient positioning verification check and for portal dosimetry purposes. The quality control …

In radiotherapy, the application of the IMRT arc technique, a special technique of external
beam irradiation, while providing greater ballistic accuracy and personalization of treatment …