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3 dimensional reconstruction

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https://www.readbyqxmd.com/read/29683430/reconnection-of-interrupted-curvilinear-structures-via-cortically-inspired-completion-for-ophthalmologic-images
#1
Jiong Zhang, Erik Bekkers, Da Chen, Tos T J M Berendschot, Jan Schouten, Josien P W Pluim, Yonggang Shi, Behdad Dashtbozorg, Bart M Ter Haar Romeny
OBJECTIVE: In this paper, we propose a robust, efficient, and automatic reconnection algorithm for bridging interrupted curvilinear skeletons in ophthalmologic images. METHODS: This method employs the contour completion process, i.e., mathematical modeling of the direction process in the roto-translation group to achieve line propagation/completion. The completion process can be used to reconstruct interrupted curves by considering their local consistency. An explicit scheme with finite-difference approximation is used to construct the three-dimensional (3-D) completion kernel, where we choose the Gamma distribution for time integration...
May 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29682804/towards-high-performance-electrocatalysts-for-oxygen-reduction-inducing-atomic-level-reconstruction-of-fe-nx-site-for-atomically-dispersed-fe-n-doped-hierarchically-porous-carbon
#2
Hanyu Li, Zhengping Zhang, Meiling Dou, Feng Wang
A rational and effective strategy for the synthesis of high-performance non-precious metal electrocatalyst for oxygen reduction reaction (ORR) was developed by inducing reconstruction of Fe-Nx site on pig-bone-derived nitrogen-doped hierarchically porous carbon. The resultant Fe/N-doped carbon electrocatalyst possessed abundant atomically dispersed nonplanar Fe-N4 ORR active sites with absolute presence of active D1 (FeII-N4) and D3 (N-FeII-N2+2) sites, as well as large specific surface area and three-dimensional porous structure with hierarchical micro-/meso-/macro-pore distribution, which increased the utilization of active sites and promoted mass transport of ORR reactants, resulting in a remarkably superior ORR activity with half-wave potential of 0...
April 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29682414/three-dimensional-architecture-of-the-whole-human-soleus-muscle-in-vivo
#3
Bart Bolsterlee, Taija Finni, Arkiev D'Souza, Junya Eguchi, Elizabeth C Clarke, Robert D Herbert
Background: Most data on the architecture of the human soleus muscle have been obtained from cadaveric dissection or two-dimensional ultrasound imaging. We present the first comprehensive, quantitative study on the three-dimensional anatomy of the human soleus muscle in vivo using diffusion tensor imaging (DTI) techniques. Methods: We report three-dimensional fascicle lengths, pennation angles, fascicle curvatures, physiological cross-sectional areas and volumes in four compartments of the soleus at ankle joint angles of 69 ± 12° (plantarflexion, short muscle length; average ± SD across subjects) and 108 ± 7° (dorsiflexion, long muscle length) of six healthy young adults...
2018: PeerJ
https://www.readbyqxmd.com/read/29679587/orbital-floor-reconstruction-3-dimensional-analysis-shows-comparable-morphology-of-scapular-and-iliac-crest-bone-grafts
#4
Joel C Davies, Harley H L Chan, Jonathan M Bernstein, David P Goldstein, Jonathan C Irish, Ralph W Gilbert
PURPOSE: Current nonvascular osseous reconstructive options for reconstruction of the orbital floor after maxillectomy include options such as scapular tip and iliac crest bone grafts. The aim of this study was to determine whether these donor sites were morphologically comparable with the orbital floor. MATERIALS AND METHODS: A retrospective cross-sectional study design was selected. By use of a pre-existing melanoma database (January 1, 2005, through September 20, 2015), computed tomography scans of the head, neck, thorax, and pelvis were obtained from patients without evidence of bony metastases...
March 28, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29679585/personalized-bioactive-nasal-supports-for-postoperative-cleft-rhinoplasty
#5
Christen J Boyer, Jennifer E Woerner, Christopher Galea, Corbin A Gatlin, Ghali E Ghali, David K Mills, Jeffery A Weisman, Jonathan S Alexander
PURPOSE: After cleft lip and palate surgical procedures, patients often need nostril supports to help the reconstructed nostrils retain their shape during healing. Many postoperative nasal stents use a one-size-fits-all approach, in which a standard rubber tube retainer is trimmed and used to support the healing nares. The purpose of this study was to examine photogrammetry and 3-dimensional (3D) printing as a fabrication tool for postoperative patient-specific nasal supports that can be loaded with bioactive agents for localized delivery...
March 28, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29678397/varus-posteromedial-rotatory-instability-a-biomechanical-analysis-of-posterior-bundle-of-the-medial-ulnar-collateral-ligament-reconstruction
#6
Matthew J Gluck, Christina M Beck, Elan J Golan, Philip Nasser, Dave R Shukla, Michael R Hausman
BACKGROUND: Recently, there has been growing interest in the involvement of the posterior bundle of the medial ulnar collateral ligament (pMUCL) in varus posteromedial rotatory instability (PMRI). Varus PMRI has been observed clinically, but the degree of involvement of the pMUCL remains unclear. This study assessed the degree to which the pMUCL is involved in stabilizing the elbow and the feasibility of a pMUCL reconstruction to restore stability. METHODS: Movements simulating PMRI were performed in 8 cadaveric elbows...
April 17, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29677225/occlusive-titanium-barrier-for-immediate-bone-augmentation-of-severely-resorbed-alveolar-sockets-with-secondary-soft-tissue-healing-a-2-year-case-series
#7
Fabio Perret, Federica Romano, Francesco Ferrarotti, Mario Aimetti
This case series evaluated bone dimensional changes following the application of an occlusive titanium barrier on severely resorbed fresh extraction sockets to achieve bone regeneration. Six extraction sites with buccal bone loss were filled with a xenograft and covered with a titanium plate fixed by two miniscrews and left intentionally exposed. No infection occurred. After 4 months of healing, sufficient hard tissue had formed to allow implant insertion. Mean vertical bone gain was 7.3 ± 2.2 mm at the buccal side and 4...
April 20, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29674819/analysis-of-mandibular-second-molars-with-fused-roots-and-shallow-radicular-grooves-by-using-micro-computed-tomography
#8
Pablo Amoroso-Silva, Ivaldo Gomes De Moraes, Marilia Marceliano-Alves, Clovis Monteiro Bramante, Ronald Ordinola Zapata, Marco Antonio Hungaro Duarte
Aim: This study aimed to describe the morphological and morphometric aspects of fused mandibular second molars with radicular shallow grooves using micro-computed tomography (CT). Materials and Methods: Eighty-eight mandibular second molars with fused roots were scanned in a micro-CT scanner at a voxel size of 19.6 μm. After reconstruction, only molars without C-shaped roots and presenting shallow radicular grooves were selected. 30 molars were chosen for further analysis...
March 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29673966/automated-search-of-control-points-in-surface-based-morphometry
#9
Antonietta Canna, Andrea G Russo, Sara Ponticorvo, Renzo Manara, Alessandro Pepino, Mario Sansone, Francesco Di Salle, Fabrizio Esposito
Cortical surface-based morphometry is based on a semi-automated analysis of structural MRI images. In FreeSurfer, a widespread tool for surface-based analyses, a visual check of gray-white matter borders is followed by the manual placement of control points to drive the topological correction (editing) of segmented data. A novel algorithm combining radial sampling and machine learning is presented for the automated control point search (ACPS). Four data sets with 3 T MRI structural images were used for ACPS validation, including raw data acquired twice in 36 healthy subjects and both raw and FreeSurfer preprocessed data of 125 healthy subjects from public databases...
April 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29673199/thoracic-lumbar-and-sacral-pedicle-screw-placement-using-stryker-ziehm-virtual-screw-technology-and-navigated-stryker-cordless-driver-3-technical-note
#10
Praveen Satarasinghe, Kojo D Hamilton, Michael J Tarver, Robert J Buchanan, Michael T Koltz
OBJECT: Utilization of pedicle screws (PS) for spine stabilization is common in spinal surgery. With reliance on visual inspection of anatomical landmarks prior to screw placement, the free-hand technique requires a high level of surgeon skill and precision. Three-dimensional (3D), computer-assisted virtual neuronavigation improves the precision of PS placement and minimization steps. METHODS: Twenty-three patients with degenerative, traumatic, or neoplastic pathologies received treatment via a novel three-step PS technique that utilizes a navigated power driver in combination with virtual screw technology...
April 17, 2018: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/29672421/human-versus-robot-a-propensity-matched-analysis-of-the-accuracy-of-free-hand-versus-robotic-guidance-for-placement-of-s2-alar-iliac-s2ai-screws
#11
Jamal N Shillingford, Joseph L Laratta, Paul J Park, Joseph M Lombardi, Alexander Tuchman, Comron S Saifi, Ronald A Lehman, Lawrence G Lenke
STUDY DESIGN: Retrospective matched cohort analysis. OBJECTIVE: To compare the accuracy of S2 alar-iliac (S2AI) screw placement by robotic guidance versus free hand technique. SUMMARY OF BACKGROUND DATA: Spinopelvic fixation utilizing S2AI screws provides optimal fixation across the lumbosacral junction allowing for solid fusion, especially in long segment fusion constructs. Traditionally, S2AI screw placement has required fluoroscopic guidance for accurate screw placement...
April 18, 2018: Spine
https://www.readbyqxmd.com/read/29670532/confocal-microscopy-based-estimation-of-parameters-for-computational-modeling-of-electrical-conduction-in-the-normal-and-infarcted-heart
#12
Joachim Greiner, Aparna C Sankarankutty, Gunnar Seemann, Thomas Seidel, Frank B Sachse
Computational modeling is an important tool to advance our knowledge on cardiac diseases and their underlying mechanisms. Computational models of conduction in cardiac tissues require identification of parameters. Our knowledge on these parameters is limited, especially for diseased tissues. Here, we assessed and quantified parameters for computational modeling of conduction in cardiac tissues. We used a rabbit model of myocardial infarction (MI) and an imaging-based approach to derive the parameters. Left ventricular tissue samples were obtained from fixed control hearts (animals: 5) and infarcted hearts (animals: 6) within 200 μm (region 1), 250-750 μm (region 2) and 1,000-1,250 μm (region 3) of the MI border...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29669134/giant-olfactory-groove-meningioma-2-staged-approach-2-dimensional-operative-video
#13
Alexandre B Todeschini, Mostafa Shahein, Alaa S Montaser, Douglas Hardesty, Bradley A Otto, Ricardo L Carrau, Daniel M Prevedello
A 42-yr-old female presented with an olfactory groove meningioma causing progressive vision loss and anosmia. Given the size of the tumor, we opted for a 2-stage surgery: endoscopic endonasal approach (EEA) followed by a craniotomy. Stage I surgery was a transcribriform transplanum EEA using a binostril 4-hand/2 surgeons (ENT and neuro) technique, with the patient positioned supine with the head slightly turned to the right side and tilted to the left, fixed in a 3-pin head clamp, under imaging guidance, in which we drilled out all the affected skull base bone, devascularized and debulked the tumor...
April 16, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29664855/restoration-of-the-patient-specific-anatomy-of-the-proximal-and-distal-parts-of-the-humerus-statistical-shape-modeling-versus-contralateral-registration-method
#14
Lazaros Vlachopoulos, Marcel Lüthi, Fabio Carrillo, Christian Gerber, Gábor Székely, Philipp Fürnstahl
BACKGROUND: In computer-assisted reconstructive surgeries, the contralateral anatomy is established as the best available reconstruction template. However, existing intra-individual bilateral differences or a pathological, contralateral humerus may limit the applicability of the method. The aim of the study was to evaluate whether a statistical shape model (SSM) has the potential to predict accurately the pretraumatic anatomy of the humerus from the posttraumatic condition. METHODS: Three-dimensional (3D) triangular surface models were extracted from the computed tomographic data of 100 paired cadaveric humeri without a pathological condition...
April 18, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29664222/recent-developments-and-clinical-potential-on-decellularized-adipose-tissue
#15
REVIEW
Jia Dong, Mei Yu, Yan Zhang, Yin Yin, Weidong Tian
Natural and synthetic materials have been developed to provide a three-dimensional (3-D) scaffold that mimics the extracellular matrix properties for tissue regeneration and reconstruction. On account of the excellent biological and mechanical properties, diverse decellularized tissue materials have been developed as natural scaffolds. Among them, decellularized adipose tissue (DAT) has generated great interest in recent years due to the extensiveness of the source and the eximious potential to enhance the regeneration and repair of damaged tissues...
April 17, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29660055/accuracy-assessment-of-pedicle-and-lateral-mass-screw-insertion-assisted-by-customized-3d-printed-drill-guides-a-human-cadaver-study
#16
Peter A J Pijpker, Joep Kraeima, Max J H Witjes, D L Marinus Oterdoom, Maarten H Coppes, Rob J M Groen, Jos M A Kuijlen
BACKGROUND: Accurate cervical screw insertion is of paramount importance considering the risk of damage to adjacent vital structures. Recent research in 3-dimensional (3D) technology describes the advantage of patient-specific drill guides for accurate screw positioning, but consensus about the optimal guide design and the accuracy is lacking. OBJECTIVE: To find the optimal design and to evaluate the accuracy of individualized 3D-printed drill guides for lateral mass and pedicle screw placement in the cervical and upper thoracic spine...
April 5, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29656820/wall-stress-on-ascending-thoracic-aortic-aneurysms-with-bicuspid-compared-with-tricuspid-aortic-valve
#17
Yue Xuan, Zhongjie Wang, Raymond Liu, Henrik Haraldsson, Michael D Hope, David A Saloner, Julius M Guccione, Liang Ge, Elaine Tseng
OBJECTIVE: Guidelines for repair of bicuspid aortic valve-associated ascending thoracic aortic aneurysms have been changing, most recently to the same criteria as tricuspid aortic valve-ascending thoracic aortic aneurysms. Rupture/dissection occurs when wall stress exceeds wall strength. Recent studies suggest similar strength of bicuspid aortic valve versus tricuspid aortic valve-ascending thoracic aortic aneurysms; thus, comparative wall stress may better predict dissection in bicuspid aortic valve versus tricuspid aortic valve-ascending thoracic aortic aneurysms...
March 8, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29651433/ratio-of-injured-lung-volume-fraction-in-prognosis-evaluation-of-acute-pq-poisoning
#18
JinJin Liu, Ye Xiong, Mengmeng Jiang
Although paraquat (PQ) concentrations are the most reliable prognosis predictors of PQ poisoning, these laboratory tests are not readily available in all hospitals. In this study, we proposed an imaging related parameter, that is, the ratio of injured lung volume fraction, for the prognosis evaluation of acute PQ poisoning based on the correlation between disease progress and lung imaging features. An artificial neural network was trained and then used to classify the injured and normal lung regions. The ratio of injured lung volume fraction was calculated from the injured lung volume fractions in the first and second CT scans after three-dimensional reconstruction...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29649372/autogenous-bone-graft-versus-bovine-bone-graft-in-association-with-platelet-rich-plasma-for-the-reconstruction-of-alveolar-clefts-a-pilot-study
#19
Bruno Torres Bezerra, John Nadson Andrade Pinho, Fabrício Eneas Diniz Figueiredo, José Renato Moraes Carvalho Barreto Brandão, Lucas Celestino Guerzet Ayres, Luiz Carlos Ferreira da Silva
OBJECTIVE: To compare the outcomes of 2 different bone graft materials: autogenous bone grafts from mandibular symphysis and bovine bone grafts associated with platelet-rich plasma (PRP). METHODS: Twenty individuals met the inclusion criteria and accepted to participate in the study. Group A patients underwent alveolar bone grafting using autologous bone and group B patients using a bovine bone graft associated with PRP. Cone beam computed tomography scans were taken and reconstructed 3-dimensionally for all patients preoperatively and 1 year postoperatively...
January 1, 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29627045/advanced-technologies-for-imaging-and-visualization-of-the-tracheobronchial-tree-from-computed-tomography-and-mri-to-virtual-endoscopy
#20
REVIEW
Micheal C McInnis, Gordon Weisbrod, Heidi Schmidt
Advanced imaging plays an increasingly important role in the evaluation of the trachea. The use of computed tomography (CT) has evolved to include multi-planar reconstructions and 3-dimensional reconstructions for the evaluation of benign and malignant disease of the trachea. Advanced applications of CT include dynamic expiratory imaging for the diagnosis of tracheomalacia and virtual endoscopy as a complementary or alternative examination to flexible bronchoscopy. MRI of the trachea has limited applications but may see increased use in the future...
May 2018: Thoracic Surgery Clinics
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