Felipe Uriza - Academia.edu (original) (raw)

Papers by Felipe Uriza

PURPOSE/AIM The purpose of this poster is: 1. Illustrate radiographic findings of high-altitude p... more PURPOSE/AIM The purpose of this poster is: 1. Illustrate radiographic findings of high-altitude pulmonary edema (HAPE) through the presentation of a series of cases. 2. Review physiopathological aspects of HAPE 3.Review of radiologic manisfestations os HAPE as described in scientific publications CONTENT ORGANIZATION 1. Definition of HAPE 2. Presentation of series of cases 3. Physiopathology of HAPE 4. Review of reported findings of HAPE 5. Analysis of findings of our series of cases 6. Conclusions. SUMMARY High altitude pulmonary edema is a rare entity usually encountered in high altitude sites. We present a series of 10 cases presented at our institution which lies at 2600 mt . Airspace consolidation, most frequently involving upper zones of the lungs, which resolves 48-72 hours soley with oxigen therapy are the characteristic radiographic features. There is no altitude threshold o any time limit for its occurence. Elevation of arterial capillary pressure accounts for this edema.

SUMMARY This paper presents a method for vascular segmentation and atherosclerotic plaque charact... more SUMMARY This paper presents a method for vascular segmentation and atherosclerotic plaque characterization in 3D computed tomography images. The first step towards this purpose is the extraction of the vessel axis by an expansible skeleton method. It uses an iterative estimation-prediction scheme, multi-scale analysis of image moments, and second-order shape model. Vessel and plaque boundaries are then detected in the planes locally orthogonal to the centerline. Contour points are determined using the local maximum of the gradient in the image along the radial directions from a point belonging to the vessel centerline. Experimental results are presented in 3D diagnostic images of pathological carotid arteries. PALABRAS CLAVE Tomografía computari- zada Arteriosclerosis Angiografía por reso- nancia magnética

Metabolic syndrome and its relation with the distribution of visceral adipose tissue (VAT), has a... more Metabolic syndrome and its relation with the distribution of visceral adipose tissue (VAT), has aroused great interest in the development of image processing tools for its automatic quantification. A new technique for automatic segmentation of visceral and subcutaneous adipose tissue in computerized axial tomography (CT) images, by means of assessing local anatomical invariants is presented. The assessing made by an expert of the segmented images, showed low error in the quantification of VAT tissue and a high tolerance to different anatomical configurations and other kinds of image problems.

PURPOSE/AIM 1. Profound description of normal anatomy of the hilum and his correlation with its n... more PURPOSE/AIM 1. Profound description of normal anatomy of the hilum and his correlation with its normal imaging presentation. 2. Classify abnormal hilum apperance into gross signs to be described. 3. Gruop disease around the signs of hilum alteration in order to approach a differential diagnosis 4. Analyse pitfalls of the abnormal appearance of the hilum. CONTENT ORGANIZATION 1. Definition of pulmonary hilum 2. Normal anatomy-radiographic and MSCT correlation 3. The abnormal hilum: radiographic and MSCT signs of disease: illustrations and imaging cases 4. Diseases that affect pulmonary hilum appearance grouped according to sign presentation: findings and imaging cases . 5. Pitfalls 5. Conclusions SUMMARY The major teaching points of this exhibit are: 1. The pulmonary hilum are precise anatomical sites majorly formed by pulmonary arteries,bronchus,lymph nodes and fat. Size, height and location are predictable and not hihgly variable. 2. Signs: enlargment, augmented density, abnormal c...

Evaluaci6n de la GamagrafiaRenal con DMSA y el Ultrasonido Renal en el Diagn6stico de Infecci6n d... more Evaluaci6n de la GamagrafiaRenal con DMSA y el Ultrasonido Renal en el Diagn6stico de Infecci6n de Vfas Urinarias Altas en Pacientes Pedidtricos RESUMEN Objetivo: evaluar las caracteristicas operativas del ullrasonido renal y la gamagrafia renal con unsl en el diagn6stico pedi6trico de infecciones de las vias urinarias altas y comparar el desempe-fro de estas dos pruebas entre si. Disefro: estudio de pruebas diagn6sticas. Participantes: los pacientes fueron examinadrx en las unidades de Ecografia y Medicina nuclear del Departamento de Radiologia e im6genes diagnr5sticas. Los criterios de inclusi6n se aplicaron a niffos de 0 a 16 afios que asistieron a la unidad de Medicina Nuclear del Hospital de San Ignacio considerando que cada paciente debia lener parcial de orina, urocultivo, cuadro hemitico y control de temperatural ade-mds debia tener ambos estudios de im6genes diagndsticas (ecografia y el ul,rse) realizados ambulatorlamente o durantt la hospitalizaci6n, durante las primeras 9...

This case report describe a 40 years old patient with diagnosis of idiopathic chronic renal disea... more This case report describe a 40 years old patient with diagnosis of idiopathic chronic renal disease at stage 5.

Revista Colombiana de Cardiologia

PALABRAS CLAVE Nivel de activación, enfermedad carotídea, aterosclerosis, bifurcación de la arter... more PALABRAS CLAVE Nivel de activación, enfermedad carotídea, aterosclerosis, bifurcación de la arteria carótida. ABSTRACT Objectives: It is necessary to generate more sensitive diagnosis criteria for the carotid artery disease. This should be done based on the risk presented by plaque rupture and platelet aggregation. The objective of our work is to find a level of platelet activation (LA) that allows

2011 6th Colombian Computing Congress (CCC), 2011

Arterial tree segmentation is a major step for pulmonary embolism analysis and detection. The pre... more Arterial tree segmentation is a major step for pulmonary embolism analysis and detection. The present document proposes a technique applied to CT images already diagnosed as embolism positive. In order to perform the segmentation of the arterial tree, the lung's region is transformed into a mask, so that the processed volume gets reduced. Then, through thresholding, region growing, and morphological operations the arterial tree is segmented in 3D. The proposed technique was evaluated by means of arterial counting in each segmented slice as well as in the original ones. That technique got a 93.72% of arterial matching on six datasets of CT images.

Lecture Notes in Computer Science, 2012

This work introduces a 3D+t coronary registration strategy to minimize the navigation among cardi... more This work introduces a 3D+t coronary registration strategy to minimize the navigation among cardiac phases during the process of ischaemic heart disease diagnosis. We propose to register image subvolumes containing suspected arterial lesions at two cardiac phases, instead of performing a registration of the complete cardiac volume through the whole cardiac cycle. The method rst automatically denes the extent of the sub-volumes to be aligned, then the registration is performed in two steps: a coarse rigid alignment and a deformable registration. Our method provides comparable results and is computationally less expensive than previous approaches that make use of larger spatial and temporal information.

Revista Colombiana de Cardiología, 2013

Preventive Medicine, 2010

Objective. The objective of this study was to describe the prevalence of dyslipidemia in the CARM... more Objective. The objective of this study was to describe the prevalence of dyslipidemia in the CARMELA study population.