52 documents found, page 1 of 6
Automated image analysis of lung branching morphogenesis
Rodrigues, Pedro L.; F. Rodrigues, Nuno; Duque, Duarte; Granja, Sara; Correia-Pinto, Jorge; Vilaça, João L.Regulating mechanisms of branchingmorphogenesis of fetal lung rat explants have been an essential tool formolecular research.This work presents a new methodology to accurately quantify the epithelial, outer contour, and peripheral airway buds of lung explants during cellular development frommicroscopic images. Methods.Theouter contour was defined using an adaptive and multiscale threshold algorithm whose level ...
Variations of the soft tissue thicknesses external to the ribs in pectus excava...
Rodrigues, Pedro L.; Direito-Santos, Bruno; Moreira, António H.J.; Fonseca, Jaime C.; Pinho, A.C.M.; F. Rodrigues, Nuno; Henriques-Coelho, TiagoBackground: 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 ...
Collecting system percutaneous access using real-time tracking sensors: first p...
L. Rodrigues, Pedro; L. Vilaça, João; Oliveira, Carlos; Cicione, Antonio; Rassweiler, Jens; Fonseca, Jaime; F. Rodrigues, Nuno; Correia-Pinto, JorgePurpose: Precise needle puncture of the renal collecting system is an essential but challenging step for successful percutaneous nephrolithotomy. We evaluated the efficiency of a new real-time electromagnetic tracking system for in vivo kidney puncture. Materials and Methods: Six anesthetized female pigs underwent ureterorenoscopy to place a catheter with an electromagnetic tracking sensor into the desired punc...
Palco: a multisensor realtime 3D cartoon production system
Torrão, Luis; Queirós, Sandro F.; Teixeira, Pedro M.; Vilaça, João L.; F. Rodrigues, NunoThis paper presents Palco, a prototype system specifically designed for the production of 3D cartoon animations. The system addresses the specific problems of producing cartoon animations, where the main obj ective is not to reproduce realistic movements, but rather animate cartoon characters with predefined and characteristic body movements and facial expressions. The techniques employed in Palco are simple an...
Electromagnetic tracker feasibility in the design of a dental superstructure fo...
Moreira, António H.J.; Queirós, Sandro; F. Rodrigues, Nuno; Pinho, A.C. M.; Fonseca, Jaime C.; Vilaça, João L.The success of the osseointegration concept and the Brånemark protocol is highly associated to the accuracy in the production of an implant-supported prosthesis. One of most critical steps for long-term success of these prosthesis is the accuracy obtained during the impression procedure, which is affected by factors such as the impression material, implant position, angulation and depth. This paper investigates...
Hand-held robotic device for laparoscopic surgery and training
Pereira, Ricardo; Moreira, António H. J.; Leite, Mariana; Rodrigues, Pedro L.; Queirós, Sandro; F. Rodrigues, Nuno; Leão, Pedro; Vilaça, João L.Laparoscopic surgery (LS) has revolutionized traditional surgical techniques introducing minimally invasive procedures for diagnosis and local therapies. LSs have undeniable advantages, such as small patient incisions, reduced postoperative pain and faster recovery. On the other hand, restricted vision of the anatomical target, difficult handling of the surgical instruments, restricted mobility inside the human...
Application to quantify fetal lung branching on rat explant
Rodrigues, Pedro L.; Granja, Sara; Moreira, António; F. Rodrigues, Nuno; Vilaça, João L.Recently, regulating mechanisms of branching morphogenesis of fetal lung rat explants have been an essential tool for molecular research. The development of accurate and reliable segmentation techniques may be essential to improve research outcomes. This work presents an image processing method to measure the perimeter and area of lung branches on fetal rat explants. The algorithm starts by reducing the noise c...
Automatic modeling of pectus excavatum corrective prosthesis using artificial n...
Rodrigues, Pedro L.; F. Rodrigues, Nuno; Pinho, ACM; Fonseca, Jaime C.; Correia-Pinto, Jorge; Vilaça, João L.Pectus excavatum is the most common deformity of the thorax. Pre-operative diagnosis usually includes Computed Tomography (CT) to successfully employ a thoracic prosthesis for anterior chest wall remodeling. Aiming at the elimination of radiation exposure, this paper presents a novel methodology for the replacement of CT by a 3D laser scanner (radiation-free) for prosthesis modeling. The complete elimination of...
Assessment of 3D scanners for modeling pectus carinatum corrective bar
Moreira, António H. J.; Fonseca, João Gomes; Rodrigues, Pedro L.; Fonseca, Jaime C.; Pinho, A. C. M.; Correia-Pinto, Jorge; F. Rodrigues, NunoPectus Carinatum (PC) is a chest deformity consisting on the anterior protrusion of the sternum and adjacent costal cartilages. Non-operative corrections, such as the orthotic compression brace, require previous information of the patient chest surface, to improve the overall brace fit. This paper focuses on the validation of the Kinect scanner for the modelling of an orthotic compression brace for the correcti...
Automatic modeling of an orthotic bracing for nonoperative correction of pectus...
Vilaça, João L.; L. Rodrigues, Pedro; Moreira, António H. J.; Fonseca, João Gomes; Pinho, A. C. M.; Fonseca, Jaime C.; F. Rodrigues, NunoPectus Carinatum is a deformity of the chest wall, characterized by an anterior protrusion of the sternum, often corrected surgically due to cosmetic motivation. This work presents an alternative approach to the current open surgery option, proposing a novel technique based on a personalized orthosis. Two different processes for the orthosis’ personalization are presented. One based on a 3D laser scan of the pa...