Recibido el 2 de agosto de 2013; aceptado el 7 de marzo de 2014 Disponible en Internet el 28 de octubre de 2014 PALABRAS CLAVE Umbralización global; Umbralización adaptativa; Procesamiento de imágenes médicas; Reconstrucción tridimensional de huesos; Imágenes TC; Modelación geométrica; DescomposiciónResumen El tejido óseo es el elemento principal del esqueleto. Sirve de soporte a las partes blandas, protege órganos vitales y constituye un sistema de palancas que amplifica las fuerzas generadas durante la contracción muscular.La descripción del comportamiento mecánico del tejido óseo, mediante el empleo de modelos discretos, pasa por diferentes etapas de análisis, las cuales van desde el procesamiento digital de la imagen hasta la especificación de las propiedades físicas del tejido al modelo discreto, siendo la descomposición de estos modelos en sus partes constitutivas un elemento clave.En la presente investigación se discute un método para la descripción geométrica de los huesos a partir de una secuencia de imágenes de tomografía computarizada y basado en la combinación de la umbralización global y adaptativa.Los resultados obtenidos demostraron que este método constituye una propuesta efectiva al problema del volumen parcial y la separación de los huesos en las articulaciones.
Segmentation of bone in CT images using global adaptive thresholdingAbstract Bone is the main element of the skeleton. It support soft tissues, protects vital organs and constitutes a lever system that amplifies forces generated during muscular contraction.A description is presented of the mechanical behavior of hard tissues by means of discrete models going through various stages of analysis, which range from digital image processing until the specification of physical properties of tissue to the discrete model. The decomposition of these models into their constituent parts being a key element.In this paper, we discuss a method for the geometric description of bones from a sequence of computed tomography images, combining global and adaptive thresholding to determine the geometric domain of bones in each slice. * Autor para correspondencia. Correo electrónico: dolgis@infomed.sld.cu (D.R. Ortega).
The shoulder is one of the most complex systems in the human body. To know how its work is essential to understand the biomechanics of the body. The purpose of this study was to analyze the influence of Local Coordinate Systems in the kinematic analysis of GlenoHumeral joint. The motion tracking was performed using passive sensors attached to pins. Trabecular pins were placed on the shoulder and scapula. The data processing was performed using the free open software pyFormex. The joint displacements were determined by two different variants of Coordinate Systems, being detected a difference from 2 to12 degrees
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