scholarly journals APPROACH TO 3D ANALYSIS OF GRAVITY PTOSIS

2017 ◽  
Vol XLII-2/W4 ◽  
pp. 123-127
Author(s):  
R. A. Guryanov ◽  
S. Monkin ◽  
A. Monkin ◽  
A. Petrov
Keyword(s):  
3D Model ◽  
3D Models ◽  
Operation Technique ◽  
3D Analysis ◽  
Visual Examination ◽  
Before And After ◽  
The Face ◽  
Ct Data ◽  
Mesh Models

The assessment of ptosis degree for rejuvenation procedures, the choice of following operation technique and evaluation of surgery result are based on subjective visual examination and surgeon’s experience.<br><br> The photogrammetric scans of 25 female patients of age 20 to 55 in vertical and supine (horizontal) position of body with placing the regular marker points on the face were analyzed. For 5 patients, also the CT data was acquired and segmentation of soft tissue was performed. Four of these patients underwent SMAS-lifting, the photogrammetry scanning was repeat 6 months after the operation.<br><br> Computer vision algorithms was used for markers detection on the 3D model texture, marker were projected from texture to triangular mesh. 3D mesh models were registered with user defined anatomy points and pair selection based on markers location was done. Pairs of points on vertical and horizontal 3D models were analyzed for surface tissue mobility examination.<br><br> The migration vectors of each side of the face are uniformly directed upwards and laterally. The vectors are projected at the areas of so-called ligaments demonstrate no evidence in deviation from row sequences.<br><br> The volume migration is strongly correlates with the age of examined patients, on the contrary the point migration moderately correlates with age in patients of 30 to 50 years old.<br><br> The analysis of migration vectors before and after the SMAS-lifting revealed no significant changes in surface points’ migration. The described method allows to assess the mechanical conditions of individual face and evaluate efficacy of surgery. This approach can be used for the classification of face ptosis grade.

The use of 3D printed models on trainee and patient experience for partial nephrectomies.

2021 ◽  
Vol 39 (6_suppl) ◽  
pp. 363-363
Author(s):  
E. Reilly Scott ◽  
Samuel Morano ◽  
Andrea Quinn ◽  
Erica Mann ◽  
Michelle Ho ◽  
...  
Keyword(s):  
3D Model ◽  
Standard Of Care ◽  
3D Models ◽  
University Hospital ◽  
Preoperative Imaging ◽  
Patient Specific ◽  
Tumor Characteristics ◽  
Educational Tool ◽  
Before And After ◽  
3D Printed

363 Background: 3D printing is a growing tool in surgical education due to the ability to visualize organs, tissue, and masses from multiple angles before operating on a patient. Previous studies using highly detailed and expensive 3D models costing between $1,000-250 per model have been shown to enhance patient and trainee comprehension of tumor characteristics, goals of surgery, and planned surgical procedure for partial nephrectomies. In our study we aim to use simpler and less expensive models in a greater range of patients receiving partial nephrectomies to determine the use of 3D models in patient, resident, and fellow education. Methods: 3D models of the effected kidney, mass, renal artery, and renal vein were created using preoperative imaging of undergoing partial nephrectomies at Thomas Jefferson University Hospital (TJUH) costing $35 per model. Residents and fellows filled out 3 surveys assessing their surgical plan and their confidence in the chosen plan at 3 time points: 1) Before seeing the model, 2) After seeing the model before surgery, and 3) After surgery. Ten patients filled out 2 surveys about their understanding of the kidney, their disease, the surgery they will undergo, and the risks involved with surgery before and after seeing the model. Results: Based on surveys to assess for surgical plan and confidence given to resident and fellow surgeons before and after seeing the 3D model, confidence significantly increased. Surveys given after surgery assessing anatomic and surgical comprehension found that resident and fellow surgeons rated the helpfulness of the models on their anatomical comprehension 7.6 out of 10 and the help of the models on their surgical confidence 7 out of 10. Patient understanding of their kidney, disease, and surgery significantly increased after seeing the 3D model, but the risks associated with surgery did not significantly increase. The extent that the model helped the patients learn about the kidney, their disease, the surgery, and the risks related to surgery were rated an average of 8.33, 9.67, 9.5, and 8.83 out of 10, respectively. Conclusions: Patient-specific 3D models for partial nephrectomies increase resident and fellow confidence in surgical approach and helped patients learn about their disease and feel comfortable going into surgery. Thus, it is important to continue to explore 3D models as an educational tool for both trainees and patients and potentially include 3D models as part of the standard of care. Further research could continue to explore the utility of 3D models as a pre-operative educational tool for both patients and trainees in other surgical fields.

scholarly journals Disaster Reconnaissance Using Multiple Small Unmanned Aerial Vehicles

2019 ◽  
Vol 141 (06) ◽  
pp. S7-S11
Author(s):  
Jeffrey C. Derricott ◽  
Jacob B. Willis ◽  
Cameron K. Peterson ◽  
Kevin W. Franke ◽  
John D. Hedengren
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Data Storage ◽  
3D Model ◽  
3D Models ◽  
Flight Time ◽  
High Fidelity ◽  
Computational Power ◽  
Government Officials ◽  
Aerial Vehicles ◽  
Before And After

Small rotorcraft unmanned air vehicles (sUAVs) are valuable tools in solving geospatial inspection challenges. One area where this is being widely explored is disaster reconnaissance [1]. Using sUAVs to collect images provides engineers and government officials critical information about the conditions before and after a disaster [2]. This is accomplished by creating high- fidelity 3D models from the sUAV’s imagery. However, using an sUAV to perform inspections is a challenging task due to constraints on the vehicle’s flight time, computational power, and data storage capabilities [3]. The approach presented in this article illustrates a method for utilizing multiple sUAVs to inspect a disaster region and merge the separate data into a single high-resolution 3D model.

scholarly journals The study of screw placement parameters for Ogawa type I acromial fractures by 3D simulation

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Wei Zhang ◽  
Zhongye Sun ◽  
Weiyan Li ◽  
Jun Yan ◽  
Liren Han ◽  
...  
Keyword(s):  
3D Model ◽  
Clinical Work ◽  
3D Models ◽  
3D Simulation ◽  
Type I ◽  
Insertion Point ◽  
Screw Length ◽  
Entry Points ◽  
The Mean ◽  
Ct Data

AbstractBackgroundAcromial fractures are rare and there is no consensus on fixation, but an increasing number of studies have reported using two screws to fix Ogawa type I acromial fractures. The objective of this study was to obtain the ideal length, diameter, insertion point, and angle of the screw using a novel 3D simulation.MethodsThe scapular CT data of 100 individuals were obtained to reconstruct 3D models. The transparency of the 3D model was then downgraded along the axial perspective (the view perpendicular to the cross section of the acromion axis) to find the maximum translucent area. Two virtual screws were placed at the anterior edge of the acromion until they penetrated the posterior cortical bon. The largest diameters and lengths of the screw were measured, and the direction and insertion point of the screw were observed.ResultsThe mean maximum lengths of the medial and lateral screws were 43.33 ± 6.17 mm and 39.23 ± 6.01 mm, respectively. The mean maximum diameters of the medial and lateral screws were 4.71 ± 1.23 mm and 4.97 ± 1.07 mm, respectively. Differences in screw length, diameter, and insertion point between males and females were found. The differences in screw angle between sexes were not statistically significant.ConclusionsBased on a 3D model test, we recommend the size, entry points, and angles of screws for Ogawa type I acromial fractures, providing valuable guidance for clinical work. More accurate screw parameters can be obtained preoperatively by establishing an individualized 3D model.

scholarly journals Interobserver reliability is higher for assessments with 3D software-generated models than with conventional MRI images in the classification of trochlear dysplasia

2021 ◽  
Author(s):  
Andreas Fuchs ◽  
Matthias J. Feucht ◽  
Jörg Dickschas ◽  
Jannik Frings ◽  
Markus Siegel ◽  
...  
Keyword(s):  
Trochlear Dysplasia ◽  
Interobserver Reliability ◽  
3D Models ◽  
Intraobserver Reliability ◽  
3D Analysis ◽  
Intraobserver Agreement ◽  
Grade Classification ◽  
3D Software ◽  
Dejour Classification

Abstract Purpose Trochlear dysplasia is a significant risk factor for patellofemoral instability. The severity of trochlear dysplasia is commonly evaluated based on the Dejour classification in axial MRI slices. However, this often leads to heterogeneous assessments. A software to generate MRI-based 3D models of the knee was developed to ensure more standardized visualization of knee structures. The purpose of this study was to assess the intra- and interobserver agreements of 2D axial MRI slices and an MRI-based 3D software generated model in classification of trochlear dysplasia as described by Dejour. Methods Four investigators independently assessed 38 axial MRI scans for trochlear dysplasia. Analysis was made according to Dejour’s 4 grade classification as well as differentiating between 2 grades: low-grade (types A + B) and high-grade trochlear dysplasia (types C + D). Assessments were repeated following a one-week interval. The inter- and intraobserver agreement was determined using Cohen’s kappa (κ) and Fleiss kappa statistic (κ). In addition, the proportion of observed agreement (po) was calculated for assessment of intraobserver agreement. Results The assessment of the intraobserver reliability with regard to the Dejour-classification showed moderate agreement values both in the 2D (κ = 0.59 ± 0.08 SD) and in the 3D analysis (κ = 0.57 ± 0.08 SD). Considering the 2-grade classification, the 2D (κ = 0.62 ± 0.12 SD) and 3D analysis (κ = 0.61 ± 0.19 SD) each showed good intraobserver matches. The analysis of the interobserver reliability also showed moderate agreement values with differences in the subgroups (2D vs. 3D). The 2D evaluation showed correspondences of κ = 0.48 (Dejour) and κ = 0.46 (high / low). In the assessment based on the 3D models, correspondence values of κ = 0.53 (Dejour) and κ = 0.59 (high / low) were documented. Conclusion Overall, moderate-to-good agreement values were found in all groups. The analysis of the intraobserver reliability showed no relevant differences between 2 and 3D representation, but better agreement values were found in the 2-degree classification. In the analysis of interobserver reliability, better agreement values were found in the 3D compared to the 2D representation. The clinical relevance of this study lies in the superiority of the 3D representation in the assessment of trochlear dysplasia, which is relevant for future analytical procedures as well as surgical planning. Level of evidence Level II.

scholarly journals THE ROLE OF 3D MODEL AS SURGICAL GUIDANCE IN MANDIBULAR RECONSTRUCTION SURGERY

2021 ◽  
Vol 16 (2) ◽  
pp. 79-85
Author(s):  
Mohammad Adhitya Latief
Keyword(s):  
Reconstructive Surgery ◽  
3D Model ◽  
Preoperative Planning ◽  
Maxillofacial Surgery ◽  
3D Models ◽  
Mandibular Reconstruction ◽  
Oral And Maxillofacial Surgery ◽  
Surgical Guidance ◽  
Reconstruction Surgery ◽  
Before And After

reconstruction surgery is a challenging surgery that require well prepared presurgical plan to minimize the risk of failure, to accommodate the need for precision preoperative planning, surgeons frequently need guidance such as a3-dimensional (3D) model to display complex cranial structures. Evaluation of the 3D model as surgical guidance require a review measurement regarding its efficiency and pitfalls. Purpose: the purpose of this research is to understand the importants key points that will resulted succesfull reconstructive surgery using 3D model as surgical guidance. Method:   the evaluation of surgical result in mandibular reconstruction surgery from our Department Oral and Maxillofacial surgery, Universitas Indonesia from 2012 to 2017 reveal the differences. We analyze several keypoints that may affect to the succesfull of reconstruction surgery result. Result: we compared the result between years before and after 2015, this is where we start obligate all reconstruction surgery need to have preoperative planning using3D Model. Several keypoints in using 3D model is acknowledgeable. Conclusion: the use of 3D models as surgical guidance has important role to minimize post reconstructive surgery result, surgeon need to understand the principal and keypoints in preoperative planning and regarding the use of 3D model. 

scholarly journals THE REAL IN THE VIRTUAL. THE 3D MODEL IN THE CULTURAL HERITAGE SECTOR: THE TIP OF THE ICEBERG

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 615-621
Author(s):  
S. Pratali Maffei ◽  
E. Canevese ◽  
T. De Gottardo
Keyword(s):  
3D Model ◽  
Three Dimensional ◽  
Archaeological Site ◽  
3D Models ◽  
Model Material ◽  
Research Activity ◽  
Virtual Reconstruction ◽  
Definition Of ◽  
The University

<p><strong>Abstract.</strong> The twenty-year and interdisciplinary research activity carried out by Virtualgeo has focused on the development of new methods and tools for 3D modeling that go beyond the simple digital-virtual reconstruction of solid modelling, in order to realize three-dimensional informative and photogrammetric representations that faithfully reproduce reality. These so called Advanced 3D models are the basis for carrying out metrological investigations to support the design and the BIM database population. In particular, in this paper we will deal with the segmentation tool, which allows the classification of the photogrammetric 3D model (material, degradation and chronological features). In detail, we will illustrate the collaboration experience between Virtualgeo and the University of Trieste, course in Technologies for the conservation and enhancement of architectural heritage of the Master's Degree in Architecture. The experience focused on the study of the archaeological site of the Roman river port of Aquileia, which Advanced 3D model was supplied by Virtualgeo. Firstly, the work focused on the informative contents necessary for the subsequent elaborations (different types of materials, alteration/degradation forms), starting from the use of coded lexicons (UNI 11182/2006). Subsequently, the quantitative data were associated to each category of homogeneous elements, obtainable from the segmentation (“mapping”) of the 3D model. This experience gave the chance to test the EasyCUBE PRO software: it was gradually adapted to the specific needs emerged both during the analysis of the site and the definition of conservation interventions, so as the outputs that can be generated after the elaboration of the Advanced 3D model.</p>

scholarly journals CREATING A 3D MODEL OF A MOUNTAIN RELIEF FOR GEOINFORMATION SUPPORT OF TOURISM

2021 ◽  
Vol 1 ◽  
pp. 162-168
Author(s):  
Tatyana E. Elshina ◽  
Irina P. Kokorina ◽  
Alexander V. Sysoev
Keyword(s):  
Russian Federation ◽  
3D Model ◽  
3D Models ◽  
Mountainous Terrain ◽  
The Caucasus ◽  
Mountain Terrain ◽  
The Russian Federation ◽  
The Republic ◽  
3D Scene

The paper considers the issues of creating a 3D model of mountain terrain for geoinformation support of tourism in the Russian Federation on the example of the territory of the Republic of Ingushetia. The classification of types of tourism and objects of natural and cultural heritage in the Republic of Ingushetia is carried out. As a result of the analysis of tourist and administrative sites, as well as web-services of the republics of the Caucasus, a conclusion is made about their insufficient geoinformation support. The possibilities of using 3D models of mountain terrain on web maps for tourism purposes are presented. A digital model of the mountainous terrain of the Republic of Ingushetia with animation of the natural environment has been created. A 3D scene has been developed that conveys the main terrain shapes and the location of objects on the ground. The resulting model can be used to develop routes in different directions, to ensure both organized and independent tourism.

scholarly journals BUILDING AND USING A 3D MODEL OF A MOUNTAINOUS LANDFORM FOR GEOINFORMATIONAL SUPPORT OF TOURISM

2021 ◽  
Vol 26 (5) ◽  
pp. 108-118
Author(s):  
Tatyana E. Elshina ◽  
◽  
Irina P. Kokorina ◽  
Alexander V. Sysoev ◽  
◽  
...  
Keyword(s):  
Web Services ◽  
3D Model ◽  
3D Models ◽  
The Caucasus ◽  
Unity 3D ◽  
Mountain Terrain ◽  
The Russian Federation ◽  
The Republic ◽  
3D Scene

The article deals with the creation and use of a 3D model of mountain terrain for geoinformation support of tourism in the Russian Federation on the example of the territory of the Republic of In-gushetia. The aim of the work is to develop and apply a digital 3D model of mountain terrain for use in creating an interactive tourist map on web services, as well as tourist and administrative sites of the republics of the Caucasus. Methods of geoinformational mapping, terrain modeling, cartographic research method and modern software were used: 3D Spatial Analysts, WorldMachine, Unity 3D. The classification of tourism types and objects of natural and cultural heritage in the Republic of Ingushetia is carried out. As a result of the analysis of tourist and administrative sites, as well as web-services of the republics of the Caucasus, a conclusion is made about their insufficient geoinformation support. The possibilities of using 3D models of mountain terrain on web maps for tourism purposes are pre-sented. A digital model of mountainous landform in the Republic of Ingushetia is created. A 3D scene, which shows basic relief forms and objects’ location is developed.

scholarly journals Fully Automatic Facial Deformation Transfer

Symmetry ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 27 ◽  
Author(s):  
Shaojun Bian ◽  
Anzong Zheng ◽  
Lin Gao ◽  
Greg Maguire ◽  
Willem Kokke ◽  
...  
Keyword(s):  
3D Model ◽  
Detection Method ◽  
3D Models ◽  
Facial Landmark Detection ◽  
Facial Landmark ◽  
Complex Emotions ◽  
Deformation Transfer ◽  
Fully Automatic ◽  
Transfer Method ◽  
Mesh Models

Facial Animation is a serious and ongoing challenge for the Computer Graphic industry. Because diverse and complex emotions need to be expressed by different facial deformation and animation, copying facial deformations from existing character to another is widely needed in both industry and academia, to reduce time-consuming and repetitive manual work of modeling to create the 3D shape sequences for every new character. But transfer of realistic facial animations between two 3D models is limited and inconvenient for general use. Modern deformation transfer methods require correspondences mapping, in most cases, which are tedious to get. In this paper, we present a fast and automatic approach to transfer the deformations of the facial mesh models by obtaining the 3D point-wise correspondences in the automatic manner. The key idea is that we could estimate the correspondences with different facial meshes using the robust facial landmark detection method by projecting the 3D model to the 2D image. Experiments show that without any manual labelling efforts, our method detects reliable correspondences faster and simpler compared with the state-of-the-art automatic deformation transfer method on the facial models.

scholarly journals Validation of a solvent-based process for the smoothing of additively manufactured 3D models of nasal cavities

2021 ◽  
Vol 7 (2) ◽  
pp. 423-426
Author(s):  
Viktor Meile ◽  
Maksym Tymkovych ◽  
Tobias Rusiecki ◽  
Yana Nosova ◽  
Florian Pape ◽  
...  
Keyword(s):  
Fused Deposition Modeling ◽  
3D Models ◽  
Nasal Breathing ◽  
Fused Deposition ◽  
Nasal Cavities ◽  
Liquid Phases ◽  
Aerodynamic Properties ◽  
Before And After ◽  
Roughness Analysis ◽  
Ct Data

Abstract In order to improve the reliability of diagnosis of nasal breathing disorders, aerodynamic properties have to be analyzed through experiments based on 3D models. The surface properties of the prepared respective 3D models using fused deposition modeling (FDM) should match those of native nasal cavities, thus representing their normal state and typical pathologies. In this work, we validated the smoothing of dual extruded 3D printed samples of PLA (polylactide) and PVA (polyvinyl alcohol) using the solvent TFE (trifluoroethanol). The smoothing was conducted in vapour and liquid phases of TFE. Before and after treatment of the samples in liquid and vapour phases of TFE, mass and surface roughness analysis were performed. The results of this work will help to produce and process a representative model of the human paranasal sinuses, which can be created using CT data from a patient.

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