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3D surface scanning

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https://www.readbyqxmd.com/read/29785840/exploring-photoinactivation-of-microbial-biofilms-using-laser-scanning-microscopy-and-confined-two-photon-excitation
#1
Hanna Thomsen, Fabrice E Graf, Anne Farewell, Marica B Ericson
One pertinent complication in bacterial infection is the growth of biofilms, i.e., communities of surface-adhered bacteria resilient to antibiotics. Photodynamic inactivation has been proposed as an alternative to antibiotic treatment; however, novel techniques complementing standard efficacy measures are required. Herein, we present an approach employing multiphoton microscopy complemented with Airyscan super-resolution microscopy, to visualize the distribution of curcumin in Staphylococcus epidermidis biofilms...
May 21, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29785589/a-novel-technology-for-3d-knee-prosthesis-planning-and-treatment-evaluation-using-2d-x-ray-radiographs-a-clinical-evaluation
#2
Guoyan Zheng, Hagen Hommel, Alper Akcoltekin, Benedikt Thelen, Jan Stifter, Geert Peersman
PURPOSE:  To present a clinical validation of a novel technology called "3X" which allows for 3D prosthesis planning and treatment evaluation in total knee arthroplasty (TKA) using only 2D X-ray radiographs. MATERIALS AND METHODS:  After local institution review board approvals, 3X was evaluated on 43 cases (23 for preoperative planning and 20 for postoperative treatment evaluation). All the patients underwent CT scans according to a standard protocol...
May 21, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29785282/trabecular-architecture-in-the-sciuromorph-femoral-head-allometry-and-functional-adaptation
#3
Maja Mielke, Jan Wölfer, Patrick Arnold, Anneke H van Heteren, Eli Amson, John A Nyakatura
Background: Sciuromorpha (squirrels and close relatives) are diverse in terms of body size and locomotor behavior. Individual species are specialized to perform climbing, gliding or digging behavior, the latter being the result of multiple independent evolutionary acquisitions. Each lifestyle involves characteristic loading patterns acting on the bones of sciuromorphs. Trabecular bone, as part of the bone inner structure, adapts to such loading patterns. This network of thin bony struts is subject to bone modeling, and therefore reflects habitual loading throughout lifetime...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29783660/ultraviolet-laser-lithography-of-titania-photonic-crystals-for-terahertz-wave-modulation
#4
Soshu Kirihara, Koki Nonaka, Shoichiro Kisanuki, Hirotoshi Nozaki, Keito Sakaguchi
Three-dimensional (3D) microphotonic crystals with a diamond structure composed of titania microlattices were fabricated using ultraviolet laser lithography, and the bandgap properties in the terahertz (THz) electromagnetic-wave frequency region were investigated. An acrylic resin paste with titania fine particle dispersions was used as the raw material for additive manufacturing. By scanning a spread paste surface with an ultraviolet laser beam, two-dimensional solid patterns were dewaxed and sintered. Subsequently, 3D structures with a relative density of 97% were created via layer lamination and joining...
May 18, 2018: Materials
https://www.readbyqxmd.com/read/29778655/deviation-of-femoral-intramedullary-alignment-rod-influences-coronal-and-sagittal-alignment-during-total-knee-arthroplasty
#5
Yohei Haruta, Shinya Kawahara, Kanenobu Tsuchimochi, Akihiko Hamasaki, Toshihiko Hara
BACKGROUND: An intramedullary (IM) rod is used to resect the distal femur vertically to the femoral mechanical axis in the coronal plane in many cases of total knee arthroplasties (TKA). The valgus angle between the mechanical axis and the anatomical axis of the distal femur is estimated preoperatively. It is known the deviation of the IM rod in the femoral canal could influence the femoral component alignment. However, there is no published data regarding how many degrees of deviation to make with the IM rod...
May 16, 2018: Knee
https://www.readbyqxmd.com/read/29777982/documentation-and-analysis-of-traumatic-injuries-in-clinical-forensic-medicine-involving-structured-light-three-dimensional-surface-scanning-versus-photography
#6
Awatif Shamata, Tim Thompson
Non-contact three-dimensional (3D) surface scanning has been applied in forensic medicine and has been shown to mitigate shortcoming of traditional documentation methods. The aim of this paper is to assess the efficiency of structured light 3D surface scanning in recording traumatic injuries of live cases in clinical forensic medicine. The work was conducted in Medico-Legal Centre in Benghazi, Libya. A structured light 3D surface scanner and ordinary digital camera with close-up lens were used to record the injuries and to have 3D and two-dimensional (2D) documents of the same traumas...
May 10, 2018: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/29774907/plasmon-response-evaluation-based-on-image-derived-arbitrary-nanostructures
#7
S Trautmann, M Richard-Lacroix, A Dathe, H Schneidewind, J Dellith, W Fritzsche, V Deckert
The optical response of realistic 3D plasmonic substrates composed of randomly shaped particles of different size and interparticle distance distributions in addition to nanometer scale surface roughness is intrinsically challenging to simulate due to computational limitations. Here, we present a Finite Element Method (FEM)-based methodology that bridges in-depth theoretical investigations and experimental optical response of plasmonic substrates composed of such silver nanoparticles. Parametrized scanning electron microscopy (SEM) images of surface enhanced Raman spectroscopy (SERS) active substrate and tip-enhanced Raman spectroscopy (TERS) probes are used to simulate the far-and near-field optical response...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29762319/comparison-of-bone-grafts-from-various-donor-sites-in-human-bone-specimens
#8
Mohammad Kamal, Felix Gremse, Stefanie Rosenhain, Alexander K Bartella, Frank Hölzle, Peter Kessler, Bernd Lethaus
The objective of the current study was to compare the three-dimensional (3D) morphometric microstructure in human cadaveric bone specimens taken from various commonly utilized donor sites for autogenous bone grafting. Autogenous bone grafts can be harvested from various anatomic sites and express heterogeneous bone quality with a specific 3D microstructure for each site. The long-term structural integrity and susceptibility to resorption of the graft depend on the selected donor bone. Micro-computed tomography generates high-resolution datasets of bone structures and calcifications making this modality versatile for microarchitecture analysis and quantification of the bone...
May 14, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29762259/precise-and-automatic-patient-positioning-in-computed-tomography-avatar-modeling-of-the-patient-surface-using-a-3-dimensional-camera
#9
Natalia Saltybaeva, Bernhard Schmidt, Andreas Wimmer, Thomas Flohr, Hatem Alkadhi
OBJECTIVES: The aim of this study was to evaluate the accuracy of a 3-dimensional (3D) camera algorithm for automatic and individualized patient positioning based on body surface detection and to compare the results of the 3D camera with manual positioning performed by technologists in routinely obtained chest and abdomen computed tomography (CT) examinations. MATERIALS AND METHODS: This study included data of 120 patients undergoing clinically indicated chest (n = 68) and abdomen (n = 52) CT...
May 14, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29756863/wave-function-hybridization-in-yu-shiba-rusinov-dimers
#10
Michael Ruby, Benjamin W Heinrich, Yang Peng, Felix von Oppen, Katharina J Franke
Magnetic adsorbates on superconductors induce local bound states within the superconducting gap. These Yu-Shiba-Rusinov (YSR) states decay slowly away from the impurity compared to atomic orbitals, even in 3D bulk crystals. Here, we use scanning tunneling spectroscopy to investigate their hybridization between two nearby magnetic Mn adatoms on a superconducting Pb(001) surface. We observe that the hybridization leads to the formation of symmetric and antisymmetric combinations of YSR states. We investigate how the structure of the dimer wave functions and the energy splitting depend on the shape of the underlying monomer orbitals and the orientation of the dimer with respect to the Pb lattice...
April 13, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29753964/a-web-based-system-for-neural-network-based-classification-in-temporomandibular-joint-osteoarthritis
#11
Priscille de Dumast, Clément Mirabel, Lucia Cevidanes, Antonio Ruellas, Marilia Yatabe, Marcos Ioshida, Nina Tubau Ribera, Loic Michoud, Liliane Gomes, Chao Huang, Hongtu Zhu, Luciana Muniz, Brandon Shoukri, Beatriz Paniagua, Martin Styner, Steve Pieper, Francois Budin, Jean-Baptiste Vimort, Laura Pascal, Juan Carlos Prieto
OBJECTIVE: The purpose of this study is to describe the methodological innovations of a web-based system for storage, integration and computation of biomedical data, using a training imaging dataset to remotely compute a deep neural network classifier of temporomandibular joint osteoarthritis (TMJOA). METHODS: This study imaging dataset consisted of three-dimensional (3D) surface meshes of mandibular condyles constructed from cone beam computed tomography (CBCT) scans...
May 1, 2018: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/29753014/study-on-the-interaction-of-graphene-oxide%C3%A2-silver-nanocomposites-with-bovine-serum-albumin-and-the-formation-of-nanoparticle-protein-corona
#12
Xiangyu Xu, Xuyan Mao, Yunfei Wang, Dandan Li, Zhongyu Du, Weihua Wu, Liang Jiang, Jie Yang, Jianjun Li
The interaction between graphene oxide-sliver nanocomposites (GO-AgNCPs) and bovine serum albumin (BSA) in aqueous buffer solution was investigated by using several spectroscopic and imaging techniques. The visible absorbance intensity of GO-AgNCPs increased with increasing concentrations of BSA, and a slight redshift of the surface plasmon resonance band (SPR) occurred due to the absorption of BSA on the surface of GO-AgNCPs. Fluorescence data revealed a static quenching process of BSA caused by GO-AgNCPs...
May 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29749273/enhanced-osteogenic-activity-with-boron-doped-nanohydroxyapatite-loaded-poly-butylene-adipate-co-terephthalate-fibrous-3d-matrix
#13
Aysu Arslan, Soner Çakmak, Menemşe Gümüşderelioğlu
In this study, three dimensional (3D) poly(butylene adipate-co-terephthalate) (PBAT) fibrous scaffolds with more than 90% porosity were fabricated via wet electrospinning method. Amorphous hydroxyapatite (HAp) and boron (B) doped hydroxyapatite (B-HAp) nanoparticles were produced by microwave-assisted biomimetic precipitation and encapsulated into PBAT fibres with the ratio of 5% (w/w) in order to enhance osteogenic activity of the scaffolds. Cell culture studies were carried out with human bone marrow derived stem cells (hBMSCs) and they showed that alkaline phosphatase (ALP) activity and the amounts of collagen and calcium were higher on B containing PBAT (B-HAp-PBAT) scaffolds during the 28-day culture period than that of the PBAT scaffolds...
May 11, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29748796/electrochemical-treatment-of-humic-acid-using-particle-electrodes-ensembled-by-ordered-mesoporous-carbon
#14
Xue Li, Wenwen Zhang, Di Xie, Xiaoyu Wang, Wenjian Ye, Wenyan Liang
In order to degrade the macromolecular pollutant of humic acid, the powder ordered mesoporous carbon (POMC, average pore diameter 4.29 nm) was first applied for preparing the granular OMC (GOMC, Φ × H = 4 × 3-6 mm) as electrodes in a continuous three-dimensional (3D) electrochemical system. The POMC was synthesized by hard-templating method and characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size distribution, N2 adsorption/desorption technology, and Fourier-transform infrared (FT-IR)...
May 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29748514/biofilm-inhibition-by-novel-natural-product-and-biocide-containing-coatings-using-high-throughput-screening
#15
Maria Salta, Simon P Dennington, Julian A Wharton
The use of natural products (NPs) as possible alternative biocidal compounds for use in antifouling coatings has been the focus of research over the past decades. Despite the importance of this field, the efficacy of a given NP against biofilm (mainly bacteria and diatoms) formation is tested with the NP being in solution, while almost no studies test the effect of an NP once incorporated into a coating system. The development of a novel bioassay to assess the activity of NP-containing and biocide-containing coatings against marine biofilm formation has been achieved using a high-throughput microplate reader and highly sensitive confocal laser scanning microscopy (CLSM), as well as nucleic acid staining...
May 10, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29744967/measuring-digit-lengths-with-3d-digital-stereophotogrammetry-a-comparison-across-methods
#16
Allison Gremba, Seth M Weinberg
OBJECTIVES: We compared digital 3D stereophotogrammetry to more traditional measurement methods (direct anthropometry and 2D scanning) to capture digit lengths and ratios. METHODS: The length of the second and fourth digits was measured by each method and the second-to-fourth ratio was calculated. For each digit measurement, intraobserver agreement was calculated for each of the three collection methods. Further, measurements from the three methods were compared directly to one another...
May 9, 2018: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/29742139/a-novel-soft-tissue-prediction-methodology-for-orthognathic-surgery-based-on-probabilistic-finite-element-modelling
#17
Paul G M Knoops, Alessandro Borghi, Federica Ruggiero, Giovanni Badiali, Alberto Bianchi, Claudio Marchetti, Naiara Rodriguez-Florez, Richard W F Breakey, Owase Jeelani, David J Dunaway, Silvia Schievano
Repositioning of the maxilla in orthognathic surgery is carried out for functional and aesthetic purposes. Pre-surgical planning tools can predict 3D facial appearance by computing the response of the soft tissue to the changes to the underlying skeleton. The clinical use of commercial prediction software remains controversial, likely due to the deterministic nature of these computational predictions. A novel probabilistic finite element model (FEM) for the prediction of postoperative facial soft tissues is proposed in this paper...
2018: PloS One
https://www.readbyqxmd.com/read/29740104/setup-errors-and-effectiveness-of-optical-laser-3d-surface-imaging-system-sentinel-in-postoperative-radiotherapy-of-breast-cancer
#18
Xiaobo Wei, Mengjiao Liu, Yun Ding, Qilin Li, Changhai Cheng, Xian Zong, Wenming Yin, Jie Chen, Wendong Gu
Breast-conserving surgery (BCS) plus postoperative radiotherapy has become the standard treatment for early-stage breast cancer. The aim of this study was to compare the setup accuracy of optical surface imaging by the Sentinel system with cone-beam computerized tomography (CBCT) imaging currently used in our clinic for patients received BCS. Two optical surface scans were acquired before and immediately after couch movement correction. The correlation between the setup errors as determined by the initial optical surface scan and CBCT was analyzed...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29736801/global-rigid-registration-of-ct-to-video-in-laparoscopic-liver-surgery
#19
Maria R Robu, João Ramalhinho, Stephen Thompson, Kurinchi Gurusamy, Brian Davidson, David Hawkes, Danail Stoyanov, Matthew J Clarkson
PURPOSE: Image-guidance systems have the potential to aid in laparoscopic interventions by providing sub-surface structure information and tumour localisation. The registration of a preoperative 3D image with the intraoperative laparoscopic video feed is an important component of image guidance, which should be fast, robust and cause minimal disruption to the surgical procedure. Most methods for rigid and non-rigid registration require a good initial alignment. However, in most research systems for abdominal surgery, the user has to manually rotate and translate the models, which is usually difficult to perform quickly and intuitively...
May 7, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29735859/effect-of-deproteinization-before-and-after-acid-etching-on-the-surface-roughness-of-immature-permanent-enamel
#20
F Y Abdelmegid
Objective: The purpose of this in vitro investigation was to assess the effect of deproteinization before and after acid etching on the surface roughness of immature human enamel of permanent teeth compared to acid etching alone using noncontact three-dimensional (3D) optical profilometer. Materials and Methods: Forty-eight enamel blocks were randomly distributed into 4 groups (12 each) according to the surface treatment in the form of deproteinized with 2.5% sodium hypochlorite (NaOCl) before and after acid etching with 32% phosphoric acid (H3PO4) compared to application of H3PO4 alone...
May 2018: Nigerian Journal of Clinical Practice
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