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https://www.readbyqxmd.com/read/28709673/stereophotogrammetric-impression-making-for-polyoxymethylene-milled-immediate-partial-fixed-dental-prostheses
#1
Miguel Gómez-Polo, Cristina Gómez-Polo, Jaime Del Río, Rocío Ortega
Immediate post-extraction and same-day placement of interim prostheses have increased patient acceptance of implant-supported prostheses. However, for immediate prostheses supported by multiple implants, meeting passive fit and esthetic standards is often challenging. In this clinical report, implant photogrammetry was combined with conventionally obtained digitized casts to prepare an interim, milled prosthesis from a polyoxymethylene (POM) disk, using computer-aided design and computer-aided manufacturing techniques...
July 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28663826/a-practical-application-of-photogrammetry-to-performing-rib-characterization-measurements-in-an-underground-coal-mine-using-a-dslr-camera
#2
Brent A Slaker, Khaled M Mohamed
Understanding coal mine rib behavior is important for inferring pillar loading conditions as well as ensuring the safety of miners who are regularly exposed to ribs. Due to the variability in the geometry of underground openings and ground behavior, point measurements often fail to capture the true movement of mine workings. Photogrammetry is a potentially fast, cheap, and precise supplemental measurement tool in comparison to extensometers, tape measures, or laser range meters, but its application in underground coal has been limited...
January 2017: International Journal of Mining Science and Technology
https://www.readbyqxmd.com/read/28658914/photogrammetric-correlation-of-face-with-frontal-radiographs-and-direct-measurements
#3
Gunjan Negi, Swaroopa Ponnada, N K S Aravind, Prasad Chitra
INTRODUCTION: Photogrammetry is a science of making measurements from photographs. As cephalometric analysis till date has focused mainly on skeletal relationships, photogrammetry may provide a means to reliably assess and compare soft tissue and hard tissue measurements. AIM: To compare and correlate linear measurements taken directly from subject's faces and from standardized frontal cephalometric radiographs and to correlate them with standardized frontal facial photographs of Indian population and to obtain mean values...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28640827/the-application-of-multi-baseline-digital-close-range-photogrammetry-in-three-dimensional-imaging-and-measurement-of-dental-casts
#4
Xiaoming Fu, Chun Peng, Zan Li, Shan Liu, Minmin Tan, Jinlin Song
OBJECTIVE: To explore a new technique for reconstructing and measuring three-dimensional (3D) models of orthodontic plaster casts using multi-baseline digital close-range photogrammetry (MBDCRP) with a single-lens reflex camera. STUDY DESIGN: Thirty sets of orthodontic plaster casts that do not exhibit severe horizontal overlap (>2 mm) between any two teeth were recorded by a single-lens reflex camera with 72 pictures taken in different directions. The 3D models of these casts were reconstructed and measured using the open source software MeshLab...
2017: PloS One
https://www.readbyqxmd.com/read/28635868/-the-modern-possibilities-for-the-application-of-photogrammetry-in-forensic-medical-traumatology
#5
V A Fetisov, I Yu Makarov, A A Gusarov, A S Lorents, S A Smirenin, V B Stragis
The authors discuss the modern possibilities and prospects for the application of photogrammetry (FM) in forensic medical traumatology based on the results of the analysis of the many-year experience reported in the foreign periodicals with special reference to road traffic injuries, gunshot wounds, and animals' bites. The examples of objective difficulties and promising prospects for the further application of the FM techniques in the practical work of forensic medical experts and medical criminalists are considered with reference to the use of various FM-based methods and equipment including 3D laser scanners, chambers, stereoscopic mounting attachments, etc...
2017: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/28621740/a-multi-disciplinary-approach-to-remote-sensing-through-low-cost-uavs
#6
Gabriela Calvario, Basilio Sierra, Teresa E Alarcón, Carmen Hernandez, Oscar Dalmau
The use of Unmanned Aerial Vehicles (UAVs) based on remote sensing has generated low cost monitoring, since the data can be acquired quickly and easily. This paper reports the experience related to agave crop analysis with a low cost UAV. The data were processed by traditional photogrammetric flow and data extraction techniques were applied to extract new layers and separate the agave plants from weeds and other elements of the environment. Our proposal combines elements of photogrammetry, computer vision, data mining, geomatics and computer science...
June 16, 2017: Sensors
https://www.readbyqxmd.com/read/28559791/photogrammetry-based-head-digitization-for-rapid-and-accurate-localization-of-eeg-electrodes-and-meg-fiducial-markers-using-a-single-digital-slr-camera
#7
Tommy Clausner, Sarang S Dalal, Maité Crespo-García
The performance of EEG source reconstruction has benefited from the increasing use of advanced head modeling techniques that take advantage of MRI together with the precise positions of the recording electrodes. The prevailing technique for registering EEG electrode coordinates involves electromagnetic digitization. However, the procedure adds several minutes to experiment preparation and typical digitizers may not be accurate enough for optimal source reconstruction performance (Dalal et al., 2014). Here, we present a rapid, accurate, and cost-effective alternative method to register EEG electrode positions, using a single digital SLR camera, photogrammetry software, and computer vision techniques implemented in our open-source toolbox, janus3D...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28554454/diagnosis-and-treatment-planning-of-orthodontic-patients-with-3-dimensional-dentofacial-records
#8
Amornrut Manosudprasit, Arshan Haghi, Veerasathpurush Allareddy, Mohamed I Masoud
INTRODUCTION: Cephalometrics has been the foundation of orthodontic diagnosis for many years. However, for many orthodontic patients, a lateral cephalogram might not be necessary. The aim of this study was to compare the diagnosis and treatment planning agreement between standard records and nonradiographic 3-dimensional (3D) dentofacial photogrammetry records. METHODS: Twenty patients had standard orthodontic records taken for their treatment as well as extraoral and intraoral 3D images...
June 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28552929/correlations-between-somatic-features-anteroposterior-spinal-curvatures-and-trunk-muscle-strength-in-schoolchildren
#9
Katarzyna Barczyk-Pawelec, Wioletta Dziubek, Jerzy R Piechura, Krystyna Rożek
BACKGROUND: Evaluation of body posture and strength of spinal muscles in children during their progressive ontogenesis is significant for the evaluation of their physical health condition and physical fitness. It is also a reference point in a process of control and medical care. PURPOSE: The aim if this study was to evaluate correlation between the selected features of somatic body structure, shape of anteroposterior spinal curves and force-velocity (FV) parameters of trunk muscles in school children...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28507786/application-of-hyperosmotic-nanoemulsions-in-wound-healing-partial-thickness-injury-model-in-swine
#10
Sean Connell, Jianming Li, Abigail Durkes, Lynetta Freeman
Objective: In this work, we introduce a novel hyperosmotic nanoemulsion (HNE) topical agent for use in wound healing. These topical emulsion complexes combine a lipophilic thymol nanoemulsion with a hyperosmotic saccharide matrix. This combination has been previously shown to possess synergistic antimicrobial activity against a host of common and drug-resistant pathogens in vitro. Approach: In this study, we present additional data to assess the safety and efficacy of these emulsions in a partial thickness injury model in swine...
May 1, 2017: Advances in Wound Care
https://www.readbyqxmd.com/read/28474765/assessment-of-statistical-agreement-of-three-techniques-for-the-study-of-cut-marks-3d-digital-microscope-laser-scanning-confocal-microscopy-and-micro-photogrammetry
#11
Miguel Ángel Maté-González, Julia Aramendi, José Yravedra, Ruth Blasco, Jordi Rosell, Diego González-Aguilera, Manuel Domínguez-Rodrigo
In the last few years, the study of cut marks on bone surfaces has become fundamental for the interpretation of prehistoric butchery practices. Due to the difficulties in the correct identification of cut marks, many criteria for their description and classification have been suggested. Different techniques, such as three-dimensional digital microscope (3D DM), laser scanning confocal microscopy (LSCM) and micro-photogrammetry (M-PG) have been recently applied to the study of cut marks. Although the 3D DM and LSCM microscopic techniques are the most commonly used for the 3D identification of cut marks, M-PG has also proved to be very efficient and a low-cost method...
May 5, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28468363/modelling-and-calibration-of-depth-dependent-distortion-for-large-depth-visual-measurement-cameras
#12
Peng Sun, Naiguang Lu, Mingli Dong
Lens distortion parameters vary with the distance between the object point and the image plane. We propose an analytical model of depth-dependent distortion for large depth-of-field digital cameras used for high accuracy photogrammetry. Compared with the magnification-dependent model, the proposed one does not need focusing operation during calibration, thus eliminates focusing errors and guarantees the stability of camera interior parameters. Compared with the widely used constant distortion parameter model, the proposed model reduces the maximum distortion variation from 8...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28467478/a-fast-and-robust-interpolation-filter-for-airborne-lidar-point-clouds
#13
Chuanfa Chen, Yanyan Li, Na Zhao, Jinyun Guo, Guolin Liu
A fast and robust interpolation filter based on finite difference TPS has been proposed in this paper. The proposed method employs discrete cosine transform to efficiently solve the linear system of TPS equations in case of gridded data, and by a pre-defined weight function with respect to simulation residuals to reduce the effect of outliers and misclassified non-ground points on the accuracy of reference ground surface construction. Fifteen groups of benchmark datasets, provided by the International Society for Photogrammetry and Remote Sensing (ISPRS) commission, were employed to compare the performance of the proposed method with that of the multi-resolution hierarchical classification method (MHC)...
2017: PloS One
https://www.readbyqxmd.com/read/28464240/body-growth-and-life-history-in-wild-mountain-gorillas-gorilla-beringei-beringei-from-volcanoes-national-park-rwanda
#14
Jordi Galbany, Didier Abavandimwe, Meagan Vakiener, Winnie Eckardt, Antoine Mudakikwa, Felix Ndagijimana, Tara S Stoinski, Shannon C McFarlin
OBJECTIVES: Great apes show considerable diversity in socioecology and life history, but knowledge of their physical growth in natural settings is scarce. We characterized linear body size growth in wild mountain gorillas from Volcanoes National Park, Rwanda, a population distinguished by its extreme folivory and accelerated life histories. METHODS: In 131 individuals (0.09-35.26 years), we used non-invasive parallel laser photogrammetry to measure body length, back width, arm length and two head dimensions...
May 2, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28446369/effect-of-occlusal-plane-correction-on-lip-cant-in-two-jaw-orthognathic-surgery-a-three-dimensional-analysis
#15
Christian Freudlsperger, Thomas Rückschloß, Oliver Ristow, Jens Bodem, Steffen Kargus, Robin Seeberger, Michael Engel, Jürgen Hoffmann, Christian Mertens
INTRODUCTION: The aim of the present study was to evaluate the impact of canting correction in occlusal plane (OP) on the change of lip cant (LC) using three-dimensional (3D) photogrammetry in combination with cone-beam computed tomographic (CBCT) scans in class III asymmetric patients. MATERIALS AND METHODS: Fourteen asymmetric patients with exclusively skeletal class III malocclusion undergoing two-jaw surgery were included. All patients received 3D-photogrammetry and CBCT scans before (T1) and after orthognathic surgery (T2)...
March 29, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28434385/digital-curation-and-online-resources-digital-scanning-of-surgical-tools-at-the-royal-college-of-physicians-and-surgeons-of-glasgow-for-an-open-university-learning-resource
#16
Kirsty Earley, Daniel Livingstone, Paul M Rea
Collection preservation is essential for the cultural status of any city. However, presenting a collection publicly risks damage. Recently this drawback has been overcome by digital curation. Described here is a method of digitisation using photogrammetry and virtual reality software. Items were selected from the Royal College of Physicians and Surgeons of Glasgow archives, and implemented into an online learning module for the Open University. Images were processed via Agisoft Photoscan, Autodesk Memento, and Garden Gnome Object 2VR...
January 2017: Journal of Visual Communication in Medicine
https://www.readbyqxmd.com/read/28423221/facial-asymmetry-in-head-and-neck-rhabdomyosarcoma-survivors
#17
Reineke A Schoot, Marinka L F Hol, Johannes H M Merks, Michael Suttie, Olga Slater, Marinde van Lennep, Saskia M J Hopman, David Dunaway, Jonathan Syme-Grant, Ludi E Smeele, Koos H Zwinderman, Huib N Caron, Peter Hammond
INTRODUCTION: Radiotherapy is essential for achieving and maintaining local control in head and neck rhabdomyosarcoma (HNRMS) patients. However, radiotherapy may cause outgrowth disturbances of facial bone and soft tissue, resulting in facial asymmetry. The aim of this study was to develop a method to visualize and measure facial asymmetry in HNRMS survivors using three-dimensional (3D) imaging techniques. METHODS: Facial deformity was evaluated in a multidisciplinary clinical assessment of 75 HNRMS survivors, treated with external beam radiotherapy (EBRT, n = 26) or Ablative surgery, MOulage brachytherapy, and REconstruction (AMORE, n = 49)...
April 19, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28399086/-the-currently-available-possibilities-for-the-application-of-photogrammetry-in-the-forensic-medical-expertise-of-the-blood-stains-at-the-scene-of-the-crime
#18
V A Fetisov, I Yu Makarov, A A Gusarov, A S Lorents, S A Smirenin, V B Stragis
The study of blood stains retained at the scene of the crime is of crucial importance for the preliminary inquiry. The present article is focused on the analysis of the possibilities and prospects for the use of photogrammetry (PM) as exemplified by the foreign expert practice of the blood stains examination at the site of the event. It is shown that the results of the application of digital photogrammetry in addition to the traditional methods of morphological investigations enables the forensic medical experts to reconstruct a number of unique features and circumstances that accompanied the commission of a crime at the site of the event...
2017: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/28398230/integrating-spherical-panoramas-and-maps-for-visualization-of-cultural-heritage-objects-using-virtual-reality-technology
#19
Mila Koeva, Mila Luleva, Plamen Maldjanski
Development and virtual representation of 3D models of Cultural Heritage (CH) objects has triggered great interest over the past decade. The main reason for this is the rapid development in the fields of photogrammetry and remote sensing, laser scanning, and computer vision. The advantages of using 3D models for restoration, preservation, and documentation of valuable historical and architectural objects have been numerously demonstrated by scientists in the field. Moreover, 3D model visualization in virtual reality has been recognized as an efficient, fast, and easy way of representing a variety of objects worldwide for present-day users, who have stringent requirements and high expectations...
April 11, 2017: Sensors
https://www.readbyqxmd.com/read/28363664/evaluating-accuracy-and-reliability-of-active-stereophotogrammetry-using-mavis-iii-wound-camera-for-three-dimensional-assessment-of-hypertrophic-scars
#20
Samuel Su, Sarthak Sinha, Vincent Gabriel
OBJECTIVE: Current strategies for estimating positive scar volume following burns is limited to employing subjective scar scales. This study assesses the accuracy and reliability of Measurement of Area and Volume Instrument System (MAVIS) III, a portable 3D active stereophotogrammetric imaging system, for non-invasive assessment of hypertrophic scar volume and elucidates factors that leads to inaccurate volume determination. METHODS: To determine accuracy, hypertrophic scars arising in various skin and wound types were modeled using moldable putty substance...
March 28, 2017: Burns: Journal of the International Society for Burn Injuries
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