Encontrados 13 documentos, a visualizar página 1 de 2
Nanostructured hollow tubes based on chitosan and alginate multilayers
Silva, Joana M.; Duarte, Ana Rita C.; Custódio, Catarina; Sher, Praveen; Neto, Ana I.; Pinho, A. C. Marques de; Fonseca, Jaime C.; Reis, R. L.The design and production of structures with nanometer-sized polymer fi lms based on layer-by-layer (LbL) are of particular interest for tissue engineering since they allow the precise control of physical and biochemical cues of implantable devices. In this work, a method is developed for the preparation of nanostructured hollow multilayers tubes combining LbL and template leaching. The aim is to produce hollo...
Variations of the soft tissue thicknesses external to the ribs in pectus excava...
Moreira, António H. J.; Pinto, Jorge Correia; Fonseca, Jaime C.; Vilaça, João L.; Rodrigues, Pedro L.; Pinho, A. C. Marques de; Rodrigues, Nuno F.BACKGROUND: Surgical repair of pectus excavatum (PE) has become more popular due to improvements in the minimally invasive Nuss procedure. The pre-surgical assessment of PE patients requires Computerized Tomography (CT), as the malformation characteristics vary from patient to patient. OBJECTIVE: This work aims to characterize soft tissue thickness (STT) external to the ribs among PE patients. It also presents ...
Pectus Excavatum postsurgical outcome based on preoperative soft body dynamics ...
Moreira, António H. J.; Rodrigues, Pedro L.; Fonseca, Jaime C.; Pinho, A. C. Marques de; Rodrigues, Nuno F.; Pinto, Jorge Correia; Vilaça, João L.Pectus excavatum is the most common congenital deformity of the anterior chest wall, in which an abnormal formation of the rib cage gives the chest a caved-in or sunken appearance. Today, the surgical correction of this deformity is carried out in children and adults through Nuss technic, which consists in the placement of a prosthetic bar under the sternum and over the ribs. Alth ough this technique has been ...
Thoracic wall reconstruction using ultrasound images to model/bend the thoracic...
Fonseca, João; Moreira, António H. J.; Rodrigues, Pedro L.; Fonseca, Jaime C.; Pinho, A. C. Marques de; Rodrigues, Nuno F.; Pinto, Jorge CorreiaPectus excavatum is the most common congenital deformity of the anterior thoracic wall. The surgical correction of such deformity, using Nuss procedure, consists in the placement of a personalized convex prosthesis into sub-sternal position to correct the deformity. The aim of this work is the CT-scan substitution by ultrasound imaging for the pre-operative diagnosis and pre-modeling of the prosthesis, in order...
Virtual simulation of the postsurgical cosmetic outcome in patients with pectus...
Vilaça, João L.; Moreira, António H. J.; Rodrigues, Pedro L.; Rodrigues, Nuno F.; Fonseca, Jaime C.; Pinho, A. C. Marques de; Pinto, JorgePectus excavatum is the most common congenital deformity of the anterior chest wall, in which several ribs and the sternum grow abnormally. Nowadays, the surgical correction is carried out in children and adults through Nuss technic. This technic has been shown to be safe with major drivers as cosmesis and the prevention of psychological problems and social stress. Nowadays, no application is known to predict t...
3D Surface Profile Equipment for the Characterization of the Pavement Texture -...
Vilaça, João L.; Fonseca, Jaime C.; Pinho, A. C. Marques de; Freitas, Elisabete F.Loads from vehicles alter the functional and structural characteristics of road pavements that directly affect the loss of resistance of the pavement and the users’ comfort and safety. Those alterations require constant observation and analysis of an extensive area of road surface with high precision. For such it was developed a new scanning prototype machine capable of acquiring the 3D road surface data and ch...
Automatic trajectory generation for the milling of sculpted surfaces acquired f...
Vilaça, João L.; Fonseca, Jaime C.; Pinho, A. C. Marques deDocumento submetido para revisão pelos pares. [A publicar em IEEE IECON 2009 Proceedings] ; The present work describes a set of algorithms for the milling of sculpted surfaces acquired from laser scanning systems. The milling operations cover three operations: roughing, semi-finishing and finishing. The developed algorithms use techniques ranging from computer vision to computer graphics following a different ...
Non-contact 3D acquisition system based on stereo vision and laser triangulation
Vilaça, João L.; Fonseca, Jaime C.; Pinho, A. C. Marques deThis paper proposes a novel contact 3D acquisition system based on stereo vision and laser triangulation. The system is composed by several software modules for data acquisition purposes, data calibration, data processing and data reconstruction of 3D scenes. Different 3D image techniques, such as, polynomial determination, cubic spline interpolation and hierarchical space decomposition were used. To validate t...
Calibration procedure for 3D measurement systems using two cameras and a laser ...
Vilaça, João L.; Fonseca, Jaime C.; Pinho, A. C. Marques deProva tipográfica ; In order to ensure the precision of the measurement of complex 3D object surfaces using non-contact laser scanning systems, a novel stereo vision calibration procedure based on a laser line projection plane is presented. This calibration procedure can also be used in measurement systems based on a single camera and a laser line projection. This procedure, while using only laser-coplanar poi...
A new machine for acquire pavement texture
Vilaça, João L.; Fonseca, Jaime C.; Pinho, A. C. Marques de; Freitas, Elisabete F.This paper presents a prototype machine for the acquisition and characterization of the macrotexture and megatexture of road surfaces. The development stages of the prototype machine involved: 3D data acquisition system configuration and calibration - based on laser triangulation technique, 3D surface reconstruction of the road surface and texture characterization using appropriated indicators, such as the Mean...
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