Encontrados 33 documentos, a visualizar página 1 de 4
Quantification methods for 99mTc-labelled disphosphonates uptake in cardiac amy...
Ferreira, José Manuel Belo; Neves, Matilde Sousa; Figueiredo, SérgioIntroduction: Bone scintigraphy (BS) has emerged as a non-invasive technique of increasing importance in the diagnosis of transthyretin cardiac amyloidosis (CA). The most commonly used approaches include visual grading and semi-quantitative analysis. However, these techniques are limited by operator dependence and subjectivity in interpretation. To address these challenges, absolute quantification techniques ar...
Contributo da Inteligência Artificial para classificação de imagem em estudos d...
cardoso, Mariana; Cardoso, Mariana; Santos, Vanessa; Figueiredo, SérgioIntrodução – Os métodos de Inteligência Artificial (IA) como o deep learning (DL) e, em particular, as convolutional neural networks (CNN) caracterizam-se por executar tarefas que normalmente requerem cognição humana. Nos estudos de perfusão do miocárdio, os sistemas de IA têm assumido importância como ferramenta auxiliar aos especialistas de medicina nuclear, particularmente para classificação de imagem no âmb...
Contributo da Inteligência Artificial para classificação de imagem em estudos d...
Cardoso, Mariana; Santos, Vanessa; Figueiredo, SérgioIntrodução – Os métodos de Inteligência Artificial (IA) como o deep learning (DL) e, em particular, as convolutional neural networks (CNN) caracterizam-se por executar tarefas que normalmente requerem cognição humana. Nos estudos de perfusão do miocárdio, os sistemas de IA têm assumido importância como ferramenta auxiliar aos especialistas de medicina nuclear, particularmente para classificação de imagem no âmb...
PALEOTEJO, A NETWORK FOR NEANDERTHAL AND PRE-NEANDERTHAL INVESTIGATION AND HERI...
Pereira, Telmo; Raposo, Luis; Figueiredo, Sérgio; Salvador, Margarida; Sousa, Fernanda; Pedro, Cunha; Martins, António; Cunha-Ribeiro, JoãoSince the 19th century, the Lower Tejo River (western Iberia) provide extensive evidence of Neanderthal occupation. However, due to the absence of long-term, well-funded projects and of fully-equipped research facilities, we still do not have a clear framework for the Neanderthal occupation of this crucial territory. Nowadays, probably more than ever, the increasing impact of urbanization and intensive agricult...
Image-guided nanodelivery of Pt(IV) prodrugs to GRP-receptor positive tumors
Silva, Francisco; Mendes, Carolina; D'Onofrio, Alice; Campello, Maria Paula Cabral; Marques, Fernanda; Pinheiro, Teresa; Gonçalves, KyleOver the last decades, gold nanoparticles (AuNPs) have proven to be remarkable tools for drug delivery and theranostic applications in cancer treatment. On the other hand, Pt(IV) prodrugs have been employed as an interesting alternative to the more common Pt(II) complexes, such as cisplatin, for cancer chemotherapy. Searching to design an image-guided nanocarrier to deliver selectively Pt(IV) prodrugs to tumors...
MUGA processing: intra and interoperator variability impact using manual and au...
Belo, Rita; Carvalhal, Cristiana; Figueiredo, Sérgio; carol, Elisabete; Vieira, LinaIntroduction – Multigated acquisition (MUGA) scan is mainly used for the assessment of left ventricular ejection fraction (LVEF) in patients who undergo cardiotoxic chemotherapy drugs. When applying automatic (A) or manual (M) processing methods, some biases in the quantitative metrics can be obtained. The aim of this study is to evaluate the influence of A and M methods, specifically, the inter and intraoperat...
Influence of the segmentation method – automatic vs manual – and the presence o...
Machado, Marisa; Jorge, Ricardo; Figueiredo, Sérgio; Carolino, Elisabete; Vieira, LinaIntroduction – Myocardial Perfusion Imaging (MPI) by single-photon emission computed tomography (SPECT) is one of the most widely used Non-invasive imaging tests in the diagnosis of coronary artery disease that requires correct segmentation of the left ventricle (LV), to extract perfusion parameters. The aim of this study is to evaluate the influence of automatic (A) vs. manual (M) segmentation in the quantific...
Influence of the color scale in qualitative assessment of brain perfusion imaging
Santos, Wilson; Carolino, Elisabete; Figueiredo, Sérgio; Vieira, LinaIntroduction – Brain perfusion imaging (BPI) is an imaging study that allows the acquisition of three-dimensional tomographic images of the biodistribution of a tracer, reflecting regional brain perfusion. Therefore, the color scale used has a major role in the clinical interpretation of these images. Aim – To study the influence of the color scales in qualitative evaluation of the BPI and to conclude which are...
Medical imaging and the new coronavirus: facing a disruptive threat
Figueiredo, Sérgio; Martins, Bruno; Nogueira, Fábio; Ribeiro, RicardoIn December 2019, a novel coronavirus was identified in Wuhan (China), from a cluster of patients with unexplained pneumonia and termed SARS-CoV-2, responsible for Coronavirus Disease (COVID)-19. Medical imaging modalities play an important role in the management of COVID-19 infection. Consequently, it is necessary to identify strategies and procedures for infection control in the medical imaging department. Th...
SUVmax evaluation on [68Ga]Ga-DOTA-TATE PET/CT uptake in patients with neuroend...
Maricato, Carolina; Aguiar, Isabel; Valente, Susana; Figueiredo, SérgioIntroduction – The maximum standardized uptake value (SUVmax) determination in Positron Emission Tomography (PET) with [68Ga] Ga-DOTA-TATE, allows the quantification of the density of somatostatin receptors, overexpressed by Neuroendocrine Tumors (NET). Related to the physiological and pathological pattern, the SUVmax analysis complements the visual assessment, yet this differentiation is co...