All publications of “Edson Amaro Junior”

12 results

Ultrasonography and magnetic resonance imaging of elbow ligaments: a comparative study

Aureliano Torquato Brandão ORCID logo , Edson Amaro Junior ORCID logo , Miguel José Francisco Neto ORCID logo , Rubens Mitsuo Tanaka ORCID logo , Durval do Carmo Barros Santos ORCID logo , Frederico Celestino Miranda ORCID logo , [...]

DOI: 10.31744/einstein_journal/2019AO4579

ABSTRACT Objective: To determine the value of ultrasonography in elbow ligament assessment compared to magnetic resonance imaging. Methods: A prospective single-center study involving 30 volunteers with no elbow joint changes. Two experienced ultrasound specialists evaluated both elbows of each volunteer, resulting in 60 evaluations per physician and totaling up 120 evaluations. Magnetic resonance images were obtained using a 3-Tesla machine and evaluated by two experienced radiologists, totaling up 120 exams. Each examiner assigned subjective, zero-to-5 scores to ligaments imaged, where […]

PET/MRI: a novel hybrid imaging technique. Major clinical indications and preliminary experience in Brazil

Taise Vitor, Karine Minaif Martins, Tudor Mihai Ionescu, Marcelo Livorsi da Cunha, Ronaldo Hueb Baroni, Marcio Ricardo Taveira Garcia, [...]

DOI: 10.1590/S1679-45082017MD3793

ABSTRACT In recent years, medical imaging with hybrid techniques has widely accepted and employed in clinical routine. PET/MRI offers significant advantages, including excellent contrast and resolution and reduced ionizing radiation, as compared to well-established PET/CT. Therefore, PET/MRI is a promising modality for oncologic imaging of some regions, such as brain, head and neck, liver and pelvis. This article set out to analyze clinical conditions that could benefit from PET/MRI imaging based on our caseload. The potential of PET/MRI to become […]

Interictal abnormal fMRI activation of visual areas during a motor task cued by visual stimuli in migraine

Adriana Bastos Conforto, Khallil Taverna Chaim, Mario Fernando Prieto Peres, André Leite Gonçalves, Inara Laurindo Siqueira, Maria Angela Maramaldo Barreiros, [...]

DOI: 10.1590/S1679-45082017AO3719

ABSTRACT Objective To assess changes in blood-oxygen-level-dependent activity after light deprivation compared to regular light exposure in subjects with migraine in the interictal state and in controls. Methods Ten subjects with migraine and ten controls participated in two sessions of functional magnetic resonance imaging. In each session, they performed a finger-tapping task with the right hand, cued by visual stimuli. They were scanned before and after 30 minutes of light deprivation or light exposure. In subjects with migraine, functional magnetic […]

Seeking tools for image fusion between computed tomography, structural and functional magnetic resonance methods for applications in neurosurgery

Liana Guerra Sanches da Rocha, Edson Amaro Junior

DOI: 10.1590/S1679-45082012000200007

Objective:To evaluate tools for the fusion of images generated by tomography and structural and functional magnetic resonance imaging.METHODS:Magnetic resonance and functional magnetic resonance imaging were performed while a volunteer who had previously undergone cranial tomography performed motor and somatosensory tasks in a 3-Tesla scanner. Image data were analyzed with different programs, and the results were compared.RESULTS:We constructed a flow chart of computational processes that allowed measurement of the spatial congruence between the methods. There was no single computational tool that […]

Intracellular labeling and quantification process by magnetic resonance imaging using iron oxide magnetic nanoparticles in rat C6 glioma cell line

Javier Bustamante Mamani, Lorena Favaro Pavon, Liza Aya Mabuchi Miyaki, Tatiana Tais Sibov, Fabiana Rossan, Paulo Henrique Silveira, [...]

DOI: 10.1590/S1679-45082012000200016

Objective:To assess intracellular labeling and quantification by magnetic resonance imaging using iron oxide magnetic nanoparticles coated with biocompatible materials in rat C6 glioma cells in vitro. These methods will provide direction for future trials of tumor induction in vivo as well as possible magnetic hyperthermia applications.METHODS:Aminosilane, dextran, polyvinyl alcohol, and starch-coated magnetic nanoparticles were used in the qualitative assessment of C6 cell labeling via light microscopy. The influence of the transfection agent poly-L-lysine on cellular uptake was examined. The quantification […]

Return on Scientific Investment – RoSI: a PMO dynamical index proposal for scientific projects performance evaluation and management

Cristofer André Caous, Birajara Machado, Cora Hors, Andrea Kaufmann Zeh, Cleber Gustavo Dias, Edson Amaro Junior

DOI: 10.1590/S1679-45082012000200017

Objective:To propose a measure (index) of expected risks to evaluate and follow up the performance analysis of research projects involving financial and adequate structure parameters for its development.METHODS:A ranking of acceptable results regarding research projects with complex variables was used as an index to gauge a project performance. In order to implement this method the ulcer index as the basic model to accommodate the following variables was applied: costs, high impact publication, fund raising, and patent registry. The proposed structured […]

Levodopa versus non-levodopa brain language fMRI in Parkinson’s disease

Paula Ricci Arantes, Heloise Helena Gobato, Bárbara Bordegatto Davoglio, Maria Ângela Maramaldo Barreiros, André Carvalho Felício, Orlando Graziani Povoas Barsottini, [...]

DOI: 10.1590/S1679-45082012000200010

Objective:To identify the effect of levodopa in language areas in Parkinson’s disease patients.METHODS:We evaluated 50 patients with mild to moderate Parkinson’s disease, age and gender paired to 47 healthy volunteers. We selected two homogeneous groups of 18 patients taking levodopa and 7 no levodopa patients. The functional magnetic resonance imaging verbal fluency task, with low and high cognitive demands, was performed at a 3T magnetic resonance imaging equipment. Data was analyzed with XBAM software for group maps and ANOVA comparison.RESULTS:Patients […]

Computerized brain tumor segmentation in magnetic resonance imaging

Maryana de Carvalho Alegro, Edson Amaro Junior, Rosei de Deus Lopes

DOI: 10.1590/S1679-45082012000200008

Objective:To propose an automatic brain tumor segmentation system.METHODS:The system used texture characteristics as its main source of information for segmentation.RESULTS:The mean correct match was 94% of correspondence between the segmented areas and ground truth.CONCLUSION:Final results showed that the proposed system was able to find and delimit tumor areas without requiring any user interaction.

SPEM: a state-of-the-art instrument for high resolution molecular imaging of small animal organs

Marilia Alves dos Reis, Jorge Mejia, Ilza Rosa Batista, Marycel Rosa Felisa Figols de Barboza, Solange Amorim Nogueira, Jairo Wagner, [...]

DOI: 10.1590/S1679-45082012000200015

Objective:To describe the Single Photon Emission Microscope (SPEM), a state-of-the-art instrument for small animal SPECT imaging, and characterize its performance presenting typical images of different animal organs.METHODS:SPEM consists of two independent imaging devices based on high resolution scintillators, high sensitivity and resolution Electron-Multiplying CCDs and multi-pinhole collimators. During image acquisition, the mouse is placed in a rotational vertical holder between the imaging devices. Subsequently, an appropriate software tool based on the Maximum Likelihood algorithm iteratively produces the volumetric image. Radiopharmaceuticals […]

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