4 documents found, page 1 of 1
MR-ONLY como imagem de referência na verificação do posicionamento em radioterapia
Marques, João; Caetano, Marco; Stroom, Joep; Greco, CarloIntrodução: Os sistemas de planeamento utilizam a informação das densidades eletrónicas, necessárias para o cálculo de dose provenientes da TC. Uma tendência recente é o uso da RM como única modalidade, usando as imagens de RM para criar uma TC sintética. Um fluxo de trabalho no qual todas as etapas pré-tratamento são realizadas na RM é favorável. O objetivo do estudo é validar a técnica MR-Only como imagem de ...
MR-ONLY as a reference image in verifying positioning in Radiotherapy
Marques, João; Caetano, Marco; Stroom, Joep; Greco, CarloIntroduction: The planning systems use the information of the electronic densities, needed for the calculation of the dose from the CT. A recent trend is the use of MR as the only modality, using the MR image to create a synthetic CT. A workflow in which all pre-treatment steps are performed at the MR is favorable. The objective of this study is to validate the MR-Only technique as the reference image in the ve...
Radiotherapy couches: is kevlar an obstacle? Attenuation study of three differe...
Silva, Célia; Mateus, Dalila; Vieira, Sandra; Rodrigues, Milton; Eiras, Margarida; Greco, CarloIntroduction: Treatment tabletops are usually made of carbon fibre due to its high mechanical strength and rigidity, low specific density, extremely light and regularly considered radio translucent. Our clinic acquired a Calypso 4D Localization System where electromagnetic (EM) frequencies to detect implanted transponders in the patient are used. Carbon fibre is an electrical conductive material which interfere...
Calypso’s array attenuation
Silva, Célia; Mateus, Dalila; Vieira, Sandra; Rodrigues, Milton; Eiras, Margarida; Greco, CarloIntroduction: The Calypso 4D Localization System gives the possibility to track the tumour during treatment, with no additional ionising radiation delivered. To monitor the patient continuously an array is positioned above the patient during the treatment. We intend to study, for various gantry angles, the attenuation effect of the array for 6- and 10 MV and flattening filter free (FFF) 6- and FFF 10 MV photon ...