Use Of 3D Models Research Articles

Clitoral anatomy: development of accurate 3d models with an emphasis on education

Despite Helen O'Connell's landmark publications on the anatomical structure of the clitoris, this organ has remained absent from anatomy texts and illustrations, including course materials for health professionals. We aim to illustrate a variety of 3D models currently available for true anatomical representation of the clitoris as well as the lack of academic publication in this area. A MEDLINE scoping review conducted in October 2021 was performed to assess available information for an anatomically correct 3D printed clitoris. From 25 returned articles and abstracts, 5 were assessed for eligibility, however none were appropriate to include in analysis, highlighting the lack of published literature supporting use of 3D models of the clitoris. Outside of the MEDLINE search, websites from respected education resources were reviewed. A variety of 3D models are now available for use for medical and sexual education; including a vulva with an insertable clitoris (Sex-ED), layered models with removable vulva revealing underlying clitoris (Thrive education) as well as life sized, 1:1 ratio, soft rubber 3D anatomically correct models (Fig.1. Anatomical Education). (Please note we wish to show models available with permission from these developers if abstract accepted for presentation) Clitoral anatomy and function are significant. The lack of accurate representation of the clitoris in medical and surgical textbooks and the associated silence concerning female orgasm and sexual agency continue into this century. Educators, academics and clinicians are designing accurate models of the clitoris with an aim to make this organ tangible. More work needs to be done for the scientific community to embrace this knowledge and integrate into educational materials in the future. The authors were not funded for design or development of any of the devices presented. Their participation at this conference is not supported by any company or organisation. They promote educational devices from which they derive no reward other than reputational benefit.

3D renal model for surgical planning of partial nephrectomy: A way to improve surgical outcomes.

to evaluate the impact of 3D model for a comprehensive assessment of surgical planning and quality of partial nephrectomy (PN). 195 patients with cT1-T2 renal mass scheduled for PN were enrolled in two groups: Study Group (n= 100), including patients referred to PN with revision of both 2D computed tomography (CT) imaging and 3D model; Control group (n= 95), including patients referred to PN with revision of 2D CT imaging. Overall, 20 individuals were switched to radical nephrectomy (RN). The primary outcome was the impact of 3D models-based surgical planning on Trifecta achievement (defined as the contemporary absence of positive surgical margin, major complications and ≤30% postoperative eGFR reduction). The secondary outcome was the impact of 3D models on surgical planning of PN. Multivariate logistic regressions were used to identify predictors of selective clamping and Trifecta's achievement in patients treated with PN (n=175). Overall, 73 (80.2%) patients in Study group and 53 (63.1%) patients in Control group achieved the Trifecta (p=0.01). The preoperative plan of arterial clamping was recorded as clampless, main artery and selective in 22 (24.2%), 22 (24.2%) and 47 (51.6%) cases in Study group vs. 31 (36.9%), 46 (54.8%) and 7 (8.3%) cases in Control group, respectively (p<0.001). At multivariate logistic regressions, the use of 3D model was found to be independent predictor of both selective or super-selective clamping and Trifecta's achievement. 3D-guided approach to PN increase the adoption of selective clamping and better predict the achievement of Trifecta.

Anti-spoofing detection based on eyeblink liveness testing for iris recognition

Iris pattern is the most stable biometric trait for personal identification. It is the only traits that can’t be used after a person death. Despite its stability and difficulty to spoof, it has found that presenting a high quality image of an iris one can spoof and gain an access. Furthermore, the use of video frames of an authorized personnel and the use of 3D models can cheat the system. This study aimed at presenting a solution to this problem by testing the liveness of an eye being scanned by an access control device. The algorithm works by additional process of detecting an eyeblink and background subtraction and correlation to assume liveness. For one to gain access, first an iris is scanned and identified, secondly if this iris is in the database before providing an access, an eyeblink is also sensed. If eyeblink is sensed an access is granted otherwise access is denied. An algorithm has been developed in MATLAB adopting an adaptive Canny method for edge detection. The proposed algorithm validates the user being scanned by two stages which are; Eyeblink detection, background subtraction and correlation. Testing on standard datasets of ZJU Eyeblink, ACASIA v3 and the TalkingFace databases showed show 96.47% accuracy.

Особенности узнавания и описания школьниками с особыми образовательными потребностями учебных объектов на 3D-рисунках и других цифровых учебных материалах

The aim of the study is to determine the features of recognition and description of educational objects on digital educational materials by students of 1 complementary - 5 classes with mental retardation and identify the originality of perception and the potential use of 3D models in teaching this group of students with special educational needs. The article describes the features and indicates age differences in the recognition and naming of objects presented on various digital educational materials; reveals the originality of the perception of 3D models of educational objects; formulates a number of recommendations on the use of digital visual aids, including 3D models, in the process of teaching students with mental retardation. The scientific novelty of the study lies in a comprehensive analysis of the features of recognition and description of various visualizations, presented in the form of digital educational materials, by students. As a result, the obtained data expand the understanding of the possibilities of using electronic visualization in teaching children with mental retardation and allow for a more complete design of work on the formation of media competence of modern speech pathologists and students planning professional activity in the field of teaching children with mental retardation.

409. RECONSTRUCTION OF A SEGMENTAL OESOPHAGEAL DEFECT WITH A TUBED RADIAL ARTERY FOREARM FREE FLAP GUIDED BY 3-DIMENSIONAL MODELLING

Abstract Segmental defects of the oesophagus are rare but complex. If the patient survives the initial insult, reconstructive techniques most commonly involve gastric pull-up or colonic interposition (1) however alternative techniques such as free flap reconstruction can be utilised if the former are unsuitable (2). The surgical field often is quite hostile in these cases, making pre-operative visualisation and planning critical in achieving a successful outcome. We describe our approach after a surgical complication in a 49-year-old man. cT3N2M0 GOJ adenocarcinoma, pre-operative FLOT4, three-stage oesophagectomy complicated by anastomotic leak and tracheo-gastric fistula. Cervical oesophagostomy and venting gastrostomy (via laparotomy) was performed (severe illness precluded one-lung ventilation). He improved and was discharged, but a persistent fistula from the gastric conduit to his trachea remained. Reconstruction was planned by a multidisciplinary team using detailed 3D modelling. Via right thoracotomy, the gastric conduit was reduced into the abdomen and the tracheal defect was repaired with an intercostal muscle flap. A retrosternal colonic interposition restored gastrointestinal continuity. The superior 2 cm infarcted and was replaced by a dual-paddled tubular radial forearm free flap. This complex surgical situation demonstrates how 3D visualisation of a segmental oesophageal defect can be extremely helpful in pre-operative planning. In particular, the precise anatomical location of the gastro-tracheal fistula and its relationship to the bony landmarks and surrounding vascular anatomy were critical in considering surgical access and reconstruction options. Whilst the literature describes applications of 3D visualisation for surgical planning in alternative contexts, there is minimal information of its use in upper gastrointestinal reconstruction. The use of 3D modelling and printing within the surgical context has frequently been associated with reduced operating times and improved medical outcomes (3). This case adds to the previously documented advantages of 3D modelling in surgical planning but applies them to an area not well covered in the literature. Additionally, it demonstrates the utility of an infrequently used technique (RAFF) for reconstructing a segmental oesophageal defect. Further research into quantifying the outcomes following the implementation of 3D modelling in visualisation and surgical planning would be useful in encouraging its integration into mainstream surgical practice.

MAKING 3D MODEL-BASED APPROVAL A REALITY

In recent years, various classification societies and shipbuilders have conducted R&amp;D activities on the use of 3D models created during the design phase for approval (so-called 3D Model-Based Approval, hereafter “3DMBA”). 3DMBA is an attractive concept that could bring digital transformation to the ship design process, but it also poses significant practical challenges. In particular, there is an issue with the division of design work and information in structural design, which requires the use of different software applications for different tasks such as 3D modeling, rule calculation, direct strength calculation, and 2D drawing. This causes a situation whereby each time a design change happens, it becomes necessary to modify the data in each software application, resulting in frequent duplication of work. This is also an error-prone process, because of possible discrepancies between various types of information in each application. The introduction of 3DMBA under such circumstances would further increase the workload of shipyards, as they would have to repeat this duplication of work on each software application to complete a precise 3D model. The authors have been conducting a project to realize an efficient 3DMBA process, and they concluded at ICCAS2019 that the key to achieving 3DMBA is to integrate the engineering process for rule and direct strength calculations into 3D CAD, and to implement viewer functions for efficient plan approval to enable shipyards to easily create 3D approval models. This paper presents the latest achievements and future prospects of the project.

Pre-operative planning and templating with 3-D printed models for complex primary and revision total hip arthroplasty

BackgroundComplex primary and revision THR requires comprehensive understanding of abnormal bony anatomy. Evaluation and classification of acetabular bone defects is essential to manage them appropriately. It is difficult to appreciate complex defects using conventional 2-Dimensional radiological modalities. 3D printed models can provide both visual and tactile reproduction of the bony anatomy, with potential for better pre-operative planning and making these complex surgeries more precise and accurate. Materials and methodsAnatomical 3D models of pelvis and femur were made based on CT scans of 27 patients undergoing complex primary THR/Revision THR by FDM (Fusion Deposition Modeling) technology using Flash Forge–Dreamer 3D printer with ABS (plastic) material. Models were used for pre-operative planning and simulation of surgery. Aims of the study were to study the accuracy of 3D models in predicting the implant sizes, accuracy in evaluation of acetabular bone defects and validating the utility of 3 D models through surgeon feedback. ResultsThe acetabular cup size and placement was accurate in 25 (92.6%) patients. Preoperative acetabular bone defect was accurately estimated in all the patients. There were no neurovascular complications at early and 1-year follow-up in this case series. Model realism and reliability survey response from five surgeons was graded, with average overall usefulness of 3D models of 4.86/5, average model realism was 4.9/5, average usefulness for planning was 4.74/5 and usefulness for teaching was 5/5. Conclusion3D models are accurate and help in assessing acetabular bone deficiencies reliably in complex and revision THR. Anatomical models help in surgical planning and simulation, enabling surgeons in predicting the correct implant sizes and importantly placement of acetabular cup and for management of bone defects. The safe trajectory of acetabular screws can be simulated and determined, thereby avoiding penetration into pelvis and neuro-vascular injuries.

Different Techniques of Creating Bone Digital 3D Models from Natural Specimens

The choice of technique for the creation of a 3D digital human bone model from natural specimens has a critical impact on the final result and usability of the obtained model. The cornerstone factor in 3D modeling is the number of faces of polygon mesh, along with topological accuracy, as well as resolution and level of detail of the texture map. Three different techniques (3D scanning, photogrammetry, and micro-computed tomography) have been used to create a digital 3D model of the human zygomatic bone. As implementation and use of 3D models can be divided into three main categories—visualization, simulation, and physical replication to obtain a functioning model (implant or prothesis)—the obtained models have been evaluated by the density and topological accuracy of the polygonal mesh, as well as by visual appearance by inspecting the obtained texture map. The obtained data indicate that for biomedical applications and computer biomechanical simulation the most appropriate technique of 3D model obtainment is micro-computed tomography, in its turn for visualization and educational purposes, the photogrammetry technique is a more preferable choice.

Use of 3D modeling to refine predictions of canopy light utilization: A comparative study on canopy photosynthesis models with different dimensions.

Canopy photosynthesis integrates leaf functional and structural traits in space and time and correlates positively with yield formation. Many models with different levels of architectural details ranging from zero-dimensional (0D) to three-dimensional (3D) have been developed to simulate canopy light interception and photosynthesis. Based on these models, a crop growth model can be used to assess crop yield in response to genetic improvement, optimized practices, and environmental change. However, to what extent do architectural details influence light interception, photosynthetic production, and grain yield remains unknown. Here, we show that a crop growth model with high-resolution upscaling approach in space reduces the departure of predicted yield from actual yield and refines the simulation of canopy photosynthetic production. We found crop yield predictions decreased by 12.0-48.5% with increasing the resolution of light simulation, suggesting that a crop growth model without architectural details may result in a considerable departure from the actual photosynthetic production. A dramatic difference in light interception and photosynthetic production of canopy between cultivars was captured by the proposed 3D model rather than the 0D, 1D, and 2D models. Furthermore, we found that the overestimation of crop yield by the 0D model is caused by the overestimation of canopy photosynthetically active radiation (PAR) interception and the RUE and that by the 1D and 2D model is caused by the overestimated canopy photosynthesis rate that is possibly related to higher predicted PAR and fraction of sunlit leaves. Overall, this study confirms the necessity of taking detailed architecture traits into consideration when evaluating the strategies of genetic improvement and canopy configuration in improving crop yield by crop modeling.

Virtual Planning and 3D Printing in the Management of Acute Orbital Fractures and Post-Traumatic Deformities.

Virtual surgical planning (VSP) and three-dimensional (3D) printing have advanced surgical reconstruction of orbital defects. Individualized 3D models of patients' orbital bony and soft tissues provide the surgeon with corrected orbital volume based on normalized anatomy, precise location of critical structures, and when needed a better visualization of the defect or altered anatomy that are paramount in preoperative planning. The use of 3D models preoperatively allows surgeons to improve the accuracy and safety of reconstruction, reduces intraoperative time, and most importantly lowers the rate of common postoperative complications, including over- or undercontouring of plates, orbital implant malposition, enophthalmos, and hypoglobus. As 3D printers and materials become more accessible and cheaper, the utility of printing patient-specific implants becomes more feasible. This article summarizes the traditional surgical management of orbital fractures and reviews advances in VSP and 3D printing in this field. It also discusses the use of in-house (point-of-care) VSP and 3D printing to further advance care of acute orbital trauma and posttraumatic deformities.

Use of 3D models as a didactic resource in archaeology. A case study analysis

The generation of 3D models through Terrestrial Laser Scanning has proved to be valuable tools for the study, documentation and recreation of archaeological remains. In this context, it is described how to generate a physical model to provide not only to researchers, but also as teaching material for teachers for university students, facilitating their access and study. As a practical case, this article describes the acquisition, processing and management of archaeological data in the archaeological site of Cástulo, Jaén, in South Spain. We expound how to get the 3D-printed model of the Muslim tower, showing how it is possible to generate a scale and very reliable reproduction of the structure, being also an useful and tangible material in the teaching of cultural heritage.

Experimental Validation of Deflections of Temporary Excavation Support Plates with the Use of 3D Modelling.

Almost every project is accompanied by earthworks, very often involving various types of excavation, and the work of people in the excavations. One of the most important tasks in earthworks is to ensure that the walls of the excavation are protected against sliding and that people working in and around the excavation are safe. Very often, in addition to criteria relating to safety and stability of the excavation, economic considerations are also an important criterion. This issue arises as early as the design stage and is related to the choice of construction and materials of which the shoring is to be made in such a way as to be able to withstand the pressure of the soil, ground loads resulting from stored excavated material and the operation of working machinery. Ongoing monitoring of the excavations and their reinforcement is also very important. The paper describes the unique results of experimental field tests, the purpose of which was to analyse the values of deflections of steel support plates of temporary excavation carried out on the object in 1:1 scale. The course of the experiment is presented for excavation support plates with a total depth of 6 m. Direct tests of the deflection arrow were carried out using two techniques, traditionally with a patch, and with laser scanning. Field tests were carried out for the designed situation without backfill load as well as for backfill load of 3.84, 15.36, 26.88 and 38.4 kN·m−2, respectively, for two measurement stages. Stage-I of the study consisted in collecting the results for soil in intact condition, whereas Stage-II collected results for loosened soil. The research experiment was supported by numerical calculations performed using the finite difference method in variational approach. The measured maximum deflections ranged from 14.40 to 16 mm, and the calculated values were 14.95 and 14.99 mm. The comparison of calculation results and tests proved to be very consistent. The analysis of the values of deflections showed that backfill load does not have a significant effect on the deflection of the lower plate, but it does affect the deflection of the first plate up to a depth of 1.2 m. Based on the obtained results, it is recommended to assume the limit (maximum) deflection arrow for support plates of temporary excavations at least as wgr = L/130, where L is the span of the plate. The calculation of deflection values was based on deflection values obtained experimentally and numerically for two steel variants: S235JR and S355JR. The wgr indicator of the maximum deflection arrow proposed by the authors is not stipulated by the industry standards, but it can be very helpful for the designing of excavation reinforcement.

The use of individualized 3D-printed models on trainee and patient education, and surgical planning for robotic partial nephrectomies.

3D printing is a growing tool in surgical education to visualize and teach complex procedures. Previous studies demonstrating the usefulness of 3D models as teaching tools for partial nephrectomy used highly detailed models costing between $250 and 1000. We aimed to create thorough, inexpensive 3D models to accelerate learning for trainees and increase health literacy in patients. Patient-specific, cost-effective ($30-50) 3D models of the affected urologic structures were created using pre-operative imaging of 40 patients undergoing partial nephrectomy at Thomas Jefferson University Hospital (TJUH) between July 2020 and May 2021. Patients undergoing surgery filled out a survey before and after seeing the model to assess patient understanding of their kidney, pathophysiology, surgical procedure, and risks of surgery. Three urological residents, one fellow, and six attendings filled out separate surveys to assess their surgical plan and confidence before and after seeing the model. In a third survey, they ranked how much the model helped their comprehension and confidence during surgery. Patient understanding of all four subjects significantly improved after seeing the 3D model (P < 0.001). The urology residents (P < 0.001) and fellow (P < 0.001) reported significantly increased self-confidence after interacting with the model. Attending surgeon confidence increased significantly after seeing the 3D model (P < 0.01) as well. Cost-effective 3D models are effective learning tools and assist with the evaluation of patients presenting with renal masses, and increase patient, resident, and fellow understanding in partial nephrectomies. Further research should continue to explore the utility of inexpensive models in other urologic procedures.

BRIGHTEARTH: PIPELINE FOR ON-THE-FLY 3D RECONSTRUCTION OF URBAN AND RURAL SCENES FROM ONE SATELLITE IMAGE

Abstract. With the growth of the availability and quality of satellite images, automatic 3D reconstruction from optical satellite images remains a popular research topic. Numerous applications, such as telecommunications and defence, directly benefit from the use of 3D models of both urban and rural scenes. While most of the state-of-the-art methods use stereo pairs for 3D reconstruction, such pairs are not immediately available anywhere in the world. In this paper, we propose an automatic pipeline for very-large-scale 3D reconstruction of urban and rural scenes from one high-resolution satellite image. Convolutional neural networks are trained to extract key semantic information. The extracted information is then converted into GIS vector format, and enriched by both terrain and object height information. The final classification step is applied, yielding a 16-class 3D map. The presented pipeline is operational and available for commercial purposes under the BrightEarth trademark.

PD37-08 3D MODELING OF RENAL TUMORS FOR PLANNING AND GUIDANCE OF SELECTIVE CLAMPING AND UCS SUTURE

PD37-08 3D MODELING OF RENAL TUMORS FOR PLANNING AND GUIDANCE OF SELECTIVE CLAMPING AND UCS SUTURE

Perry Bar &amp; Witton FRMS: Forge Mill Flood Storage Area – Lessons Learnt

The Perry Barr and Witton Flood Risk Management Scheme in Birmingham protects over 1,300 properties from a 1% Annual Exceedance Probability flood event. A key component of the scheme is the Forge Mill flood storage area. Construction started in 2018 with the Preliminary Certificate signed off in spring 2022. This paper will discuss the project and share lessons learnt from the construction phase. The lessons learnt cover a variety of areas including programme considerations, use of erosion protection matting, trash screen management and use of 3D models in construction.

Editorial for the Special Issue: “3D Virtual Reconstruction for Cultural Heritage”

The use of 3D modelling, computer-aided design (CAD), augmented reality (AR) and virtual reality (VR) for the acquisition and virtual reconstruction of Cultural Heritage is of great importance in the analysis, study, documentation and dissemination of the past [...]

Results of post-infarction left ventricular aneurysms surgical planning using magnetic resonance imaging and three-dimensional modeling

Aim. To evaluate the results of surgical intervention planning using three-dimensional models based on magnetic resonance imaging in patients with postinfarction left ventricular aneurysms.Material and Methods. Two groups of patients with postinfarction left ventricular aneurysm (PLVA) were included in the study, totaling 41 patients. The first (experimental) group included 17 patients diagnosed with PLVA by magnetic resonance imaging (MRI), and surgical intervention planning was performed using a 3D model of the heart. The control group comprised 24 patients in whom PLVA was diagnosed by echocardiography (TTE) or ventriculography, and surgical intervention planning was performed using traditional two-dimensional slice images.Results. Comparison of full perfusion under cardiopulmonary bypass (CPB) showed statistically significant differences between the groups: this parameter was 60 [56; 68] min in group 1 vs. 71 [61; 84] min in group 2, which was significantly higher (p = 0.043). There were no significant differences in total operation time (280 [265; 320] min in group 1 vs. 263 [248; 283] min in group 2, p = 0.055), overall CPB time (93 [86; 109] min in group 1 vs. 104 [83; 109] min in group 2, p = 0.653), and partial CPB time (31 [26; 39] min in group 1 vs. 27 [21; 32] min in group 2, p = 0.127).Conclusion. The use of 3D models to support surgeons for PLVA correction makes it possible to determine the type of reconstructive surgery, practice the main stages of the upcoming intervention, and reduce the time of full perfusion under CPB during its implementation.

A 3D approach to investigate the burials: the virtual reconstruction of tb. 22 of necropolis of Piovego (PD)

Abstract The burials of the necropolis of Piovego (PD) have been subjected in the past years to processual research to reconstruct the post-depositional dynamics, thus providing a two-dimensional reconstruction of the original structure of the graves. The goal of this research is to define a new methodology on burial 22 of the necropolis, to replicate in other archaeological contexts. This new methodology aimed to create morphometrically accurate 3D models with a correct topological relationship between the grave finds and between them and the burial structure. 3D models of both the findings and structural elements of the burial were made from graphic documents with the aid of 3D modelling and 3D scanning techniques. The use of 3D models allowed the development of new hypotheses on the placement of the grave goods and their position within the space available in the burial. Furthermore, the models were useful to measure more accurately the perishable elements and to estimate their shape and position. The digital technologies allowed us to work in a three-dimensional perspective, overcoming the limits of a traditional approach and verifying previous hypotheses on the topology of the burial, such as positioning of the finds and the existence of perishable materials that were not preserved.

Technology of application of 3D models of electrical engineering in the performing laboratory work

The article presents the technology of application of 3D models of electrical engineering in the performing laboratory work. It was outlined the organizational and methodological conditions, forms and methods, learning tools of the proposed technology. The organizational and methodological conditions include the use of computer 3D models in laboratory work; creation and implementation into the educational process laboratory work that involves the development of computer 3D modeling; providing the necessary guidelines for the use and development of computer 3D modeling during laboratory work. Application of the 3D models in the performing laboratory work of electrical engineering disciplines can be realised on the initial, average and high levels. Upon completion of the development of the presented technology, an experimental study was conducted, which included the identification of the appropriate level of use of 3D models in the process of performing laboratory work in the study of electrical engineering disciplines. The obtained experimental results were verified using Student's statistical t-test for relative indicators. The result of the implementation of technology is the application of 3D models in educational and professional activities in the field of electrical engineering.