RESUMO
This paper describes a new method for recognizing hand configurations of the Brazilian Gesture Language - LIBRAS - using depth maps obtained with a Kinect® camera. The proposed method comprised three phases: hand segmentation, feature extraction, and classification. The segmentation phase is independent from the background and depends only on pixel depth information. Using geometric operations and numerical normalization, the feature extraction process was done independent from rotation and translation. The features are extracted employing two techniques: (2D)2LDA and (2D)2PCA. The classification is made with a novelty classifier. A robust database was constructed for classifier evaluation, with 12,200 images of LIBRAS and 200 gestures of each hand configuration. The best accuracy obtained was 95.41%, which was greater than previous values obtained in the literature.
Assuntos
Processamento de Imagem Assistida por Computador/métodos , Língua de Sinais , Adolescente , Adulto , Brasil , Bases de Dados Factuais , Feminino , Gestos , Mãos , Humanos , Idioma , Masculino , Adulto JovemRESUMO
In the most of the cases, the diagnosis of focal solid hepatic lesions are performed by ultrasonography, computed tomography, magnetic resonance and hepatic angiography imagig. However, the distinction between benign and malignant neoplasias, sometimes is made after liver biopsy. This report is about 32 of these lesions, diagnosed after guided liver biopsy by ultrasonography. The efficacy of this propedeutic method, minimally invasive, is defined emphasizing that there are no mortality and low levels of morbidity.
Assuntos
Biópsia por Agulha/métodos , Carcinoma Hepatocelular/diagnóstico , Neoplasias Hepáticas/diagnóstico , Ultrassonografia de Intervenção/métodos , Adolescente , Adulto , Idoso , Humanos , Pessoa de Meia-IdadeRESUMO
Hemangiomas are the most common benign vascular tumor found in the liver. In this study, 103 cases of hepatic hemangiomas were analysed in a retrospective manner. Image aspects such as those seen in ultrassonography, computed tomography, nuclear magnetic resonance and arteriography are discussed. The incidence was higher amongst the female sex, between individuals from 40 to 60 years old, which presented predominantly without symptoms (66%) and localized mainly in the right hepatic lobe (74%). The meaning of those aspects, when adopted, permits the clinicians to differentiate benign from malignant nodular lesions in the liver.
Assuntos
Hemangioma/diagnóstico , Neoplasias Hepáticas/diagnóstico , Adulto , Fatores Etários , Feminino , Hemangioma/diagnóstico por imagem , Artéria Hepática/diagnóstico por imagem , Humanos , Neoplasias Hepáticas/diagnóstico por imagem , Espectroscopia de Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Fatores Sexuais , Tomografia Computadorizada por Raios X , UltrassonografiaRESUMO
Over the last few years, ultrasound became important in characterization of space -occupying solid lesions of the liver. Recently, Canadian authors using this method, described a 23% incidence of intrahepatic or subcapsular hematoma after liver biopsy. We prospectively evaluated the incidence of this complication after liver biopsy under laparoscopic guidance in 8 cirrhotic patients, 7 with steatosis, 7 chronic active hepatitis and 4 with intrahepatic cholestasis. Biopsy was performed under general anesthesia provided that prothrombin activity was over 50%, serum fibrinogen was over 100% and platelets over 50.000/mm3. In none of 26 consecutive patients, was an intrahepatic or subcapsular hematoma observed.
Assuntos
Hematoma/etiologia , Hepatopatias/etiologia , Ultrassonografia , Adolescente , Adulto , Idoso , Biópsia por Agulha/efeitos adversos , Feminino , Hematoma/diagnóstico , Hematoma/patologia , Humanos , Laparoscopia , Hepatopatias/diagnóstico , Hepatopatias/patologia , Masculino , Pessoa de Meia-Idade , Estudos ProspectivosRESUMO
Os autores discutem os aspectos clinicos e patologicos da pneumatose cistoide intestinal num homem de 61 anos de idade, enfatizando as caracteristicas clinicas, radiologicas e histologicas que a distinguem de outras doencas intestinais