Local Dynamic Updating Method of Orebody Model Based on Mesh Reconstruction and Mesh Deformation

In this paper, to update the orebody model based on the given interpreted geological information, we present a local dynamic updating method of the orebody model that allows the interactive construction of the constraint deformation conditions and the dynamic updating of the mesh model. The rules for constructing deformation constraints based on the control polylines are discussed. Because only part of the model is updated, the updated mesh is effective and the overall quality is satisfactory. Our main contribution is that we propose a local dynamic updating method for the orebody model based on mesh reconstruction and mesh deformation. This method can automatically update a given 3D orebody model based on a set of unordered geological interpretation lines. Moreover, we implement a deformation neighborhood region search method based on the specified ring radius and a local constrained mesh deformation algorithm for the orebody model. Finally, we test the method and show the model update results with real geological datasets, which proves that this method is effective for the local updating of orebody models.

O32 TREATMENT OF FASCIAL DEHISCENCE IS IMPROVED BY MESH REINFORCEMENT

Aim In 2014 fascial dehiscence (FD) was treated with re-suturing the fascia as the only measure in half of the cases at our institution, with discouraging re-rupture and incisional hernia (IH) rates. A changing path away from fascia closure (FC) by re-suturing solely towards reinforcement of the closed fascia is now evaluated. Material and Methods Retrospective chart review of consecutive patients operated for FD 2016-2020. Available CT scans were scrutinized for IH. Results 58 patients (14 women) with a mean age of 71 years and a mean BMI of 27.3 were treated with: FC by re-suturing as the only measure (n = 1, 1.7%); FC preceded by a reinforced tension line (RTL) suture (n = 9, 15.5%); FC and on-lay mesh reinforcement (n = 23, 39.7%); retromuscular mesh closure (n = 10, 17.2%); open abdomen treatment with retromuscular mesh reconstruction (n = 1, 1.7%); and, open abdomen treatment with vacuum assisted wound closure and permanent on-lay mesh-mediated fascial traction (VAWCPOM) (n = 14, 24.1%). One patient in the RTL-group suffered a re-rupture (1.7%). The in-hospital mortality was 5%. Wound healing problems were seen in 29 (51.9%) patients. IH was evaluable in 49 patients with a total incidence of 22.4% at mean follow-up of 21 months. The hernia incidence for mesh reinforced or reconstructed patients was 17.5% compared to 44.4% in re-sutured or RTL patients. Conclusions FD treatment with mesh reinforced FC prevented re-rupture and resulted in a lower rate of IH. Additional standardization and refining the mesh techniques may further improve results.

P022 OUTCOMES OF ABDOMINAL WALL REPAIR ASSOCIATED WITH INTESTINAL TRANSIT RECONSTRUCTION SURGERY

Aim Analyze and evaluate the results obtained in patients undergoing transit reconstruction surgery in which an abdominal wall reconstruction (AWR) is associated using a multidisciplinary approach. Material and Methods All patients who underwent an intestinal transit reconstruction associated with an AWR surgery were identified from a prospectively maintained multicenter database. Short and long-term results have been analyzed, especially AWR outcomes. Results 10 patients were identified. 60% were men. Mean time since previous surgery was 1.66 years. 8 cases (80%) associated a midline incisional hernia with the parastomal hernia. 3 (30%) bilateral posterior component separation (PCS) Madrid transverse abdominis muscle release (Madrid TAR) modification, 5 (50%) unilateral Madrid TAR, 1 (10%) PCS Carbonell, and 1 (10%) Rives-Stoppa techniques were performed. A double mesh reconstruction technique was used in 60% of the patients, associating absorbable mesh with a permanent mesh. One patient presented a paucisymptomatic colorectal anastomosis fistula, that could be managed conservatively. A case of postsurgical ileus was also evidenced. Surgical site ocurrences (SSO) were recorded in 4 patients (40%), all of them related to surgical site infection that required a bedside wound opening. During a mean follow-up of 24 (+/- 15) months, there was no evidence of hernia recurrence. No cases of bulging, chronic mesh infection or chronic pain were reported. No case of mortality was recorded in the series. Conclusions Intestinal transit reconstruction surgery associated with an AWR, with a multidisciplinary team managed, presents acceptable long-term results, despite the high SSO associated.

Textured Mesh Generation Using Multi-View and Multi-Source Supervision and Generative Adversarial Networks

This study focuses on reconstructing accurate meshes with high-resolution textures from single images. The reconstruction process involves two networks: a mesh-reconstruction network and a texture-reconstruction network. The mesh-reconstruction network estimates a deformation map, which is used to deform a template mesh to the shape of the target object in the input image, and a low-resolution texture. We propose reconstructing a mesh with a high-resolution texture by enhancing the low-resolution texture through use of the super-resolution method. The architecture of the texture-reconstruction network is like that of a generative adversarial network comprising a generator and a discriminator. During the training of the texture-reconstruction network, the discriminator must focus on learning high-quality texture predictions and to ignore the difference between the generated mesh and the actual mesh. To achieve this objective, we used meshes reconstructed using the mesh-reconstruction network and textures generated through inverse rendering to generate pseudo-ground-truth images. We conducted experiments using the 3D-Future dataset, and the results prove that our proposed approach can be used to generate improved three-dimensional (3D) textured meshes compared to existing methods, both quantitatively and qualitatively. Additionally, through our proposed approach, the texture of the output image is significantly improved.

Acute PEBI Grid Generation for Reservoir Geometries

An unstructured grid generation method is presented that automates control-volume boundary alignment to geological objects and control point alignment to complex wells. The grid generation method is coupled with an iterative acute mesh reconstruction technique, to construct essentially acute triangulations, while satisfying quite general geometric constraints. For well aligned grids control points are constrained to the well trajectory and protection circles are used, whereas for boundary aligned grids halo construction is performed. Unstructured Delaunay triangulations (DT) have the desirable locally orthogonal perpendicular bisectional (PEBI) property, required by the industry standard two-point flux approximation for consistency for isotropic fields. The PEBI property can only be exploited if such grids are comprised of acute simplexes, with circumcentres located inside their respective elements. The method presented enables acute DT layered mesh generation while honoring internal boundaries and wells in a two dimensional space. A dual (Voronoi) grid derived from a feature honored simplicial mesh is then projected in the vertical direction generating 2.5D PEBI grids. Effectiveness of the method to construct acute PEBI grids honoring geological objects and complex wells is demonstrated by meshing representative reservoir geometries. Numerical results are presented that verify consistency of the two-point flux on the resulting boundary-aligned acute PEBI grids. Development of an unstructured grid generation method which 1) Automates interior boundary alignment, 2) Honors features with respect to control point and/or control volume, and 3) Generates acute PEBI grids for reservoir geometries is presented. A unique workflow is presented to generate boundary aligned acute PEBI grids for complex geometries. Development of boundary aligned grids that honor both geological objects and multilateral complex wells, together with mesh reconstruction to ensure circumcenter containment is presented. Further, 3D PEBI grid generation method which can limit refinement to well perforations and geological objects is also described.

Synthetic Mesh Reconstruction of Chronic, Native Quadriceps Tendon Disruptions following Failed Primary Repair

Case. Two patients presented with chronic knee extensor mechanism disruption after failed primary repairs. Both patients had minimal ambulatory knee function prior to surgical intervention and were treated with a synthetic mesh reconstruction of their extensor mechanism. Our technique has been modified from previously described techniques used in revision knee arthroplasty. At the one-year follow-up, both patients had improvement in their active range of motion and had returned to their previous activity. Conclusion. Synthetic mesh reconstruction of chronic extensor mechanism disruption is a viable technique that can be utilized as salvage for the persistently dysfunctional native knee.