3 documents found, page 1 of 1
Case Report: Rare Convexity Meningeal Chondroma Mimicking a Meningioma
Abreu, PG; Pappamikail, L; Pontinha, C; Drago, J; Lourenço, JA; Romero, C; Teles, P; Correia, JPBackground: Intracranial chondromas account for 0.2-0.3% of all intracranial neoplastic lesions and less than a quarter arise in the convexity or falx. Despite its benign nature, exceedingly rare malignant transformations exist. The misdiagnosis with meningiomas is frequent and may be related with chondromas' similar insidious clinical presentation and imaging features. Standalone surgery is advised and complet...
Estimation of the collective ionizing dose in the Portuguese population for the...
Costa, F; Teles, P; Nogueira, A; Barreto, A; Santos, A I; Carvalho, A; Martins, B; Oliveira, C; Gaspar, C; Barros, C; Neves, D; Costa, D; Rodrigues, EIn 2009-2010 a Portuguese consortium was created to implement the methodologies proposed by the Dose Datamed II (DDM2) project, aiming to collect data from diagnostic X-ray and nuclear medicine (NM) procedures, in order to determine the most frequently prescribed exams and the associated ionizing radiation doses for the Portuguese population. The current study is the continuation of this work, although it focus...
Assessment of Patient Dose Reduction by Bismuth Shielding in CT Using Measureme...
Mendes, M; Costa, F; Figueira, C; Madeira, P; Teles, P; Vaz, PThis work reports on the use of two different Monte Carlo codes (GEANT4 and MCNPX) for assessing the dose reduction using bismuth shields in computer tomography (CT) procedures in order to protect radiosensitive organs such as eye lens, thyroid and breast. Measurements were performed using head and body PMMA phantoms and an ionisation chamber placed in five different positions of the phantom. Simulations were p...