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https://www.readbyqxmd.com/read/28927933/azopolymer-photopatterning-for-directional-control-of-angiogenesis
#1
Chiara Fedele, Maria De Gregorio, Paolo A Netti, Silvia Cavalli, Chiara Attanasio
Understanding cellular behavior in response to microenvironmental stimuli is central to tissue engineering. An increasing number of reports emphasize the high sensitivity of cells to the physical characteristics of the surrounding milieu and in particular, topographical cues. In this work, we investigated the influence of dynamic topographic signal presentation on sprout formation and the possibility to obtain a space-time control over sprouting directionality without growth factors, in order to investigate the contribution of just topography in the angiogenic process...
September 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28925750/study-of-the-x-ray-diagnosis-of-unstable-pelvic-fracture-displacements-in-three-dimensional-space-and-its-application-in-closed-reduction
#2
Chengdi Shi, Leyi Cai, Wei Hu, Junying Sun
ABSTRACTS Objective: To study the method of X-ray diagnosis of unstable pelvic fractures displaced in three-dimensional (3D) space and its clinical application in closed reduction. METHODS: Five models of hemipelvic displacement were made in an adult pelvic specimen. Anteroposterior radiographs of the pelvis were analyzed in PACS. The method of X-ray diagnosis was applied in closed reductions. From February 2012 to June 2016, 23 patients (15 men, 8 women; mean age, 43.4 years) with unstable pelvic fractures were included...
September 19, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3%C3%A2-tesla-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#3
Rüdiger Stirnberg, Willem Huijbers, Daniel Brenner, Benedikt A Poser, Monique Breteler, Tony Stöcker
State-of-the-art simultaneous-multi-slice (SMS-)EPI and 3D-EPI share several properties that benefit functional MRI acquisition. Both sequences employ equivalent parallel imaging undersampling with controlled aliasing to achieve high temporal sampling rates. As a volumetric imaging sequence, 3D-EPI offers additional means of acceleration complementary to 2D-CAIPIRINHA sampling, such as fast water excitation and elliptical sampling. We performed an application-oriented comparison between a tailored, six-fold CAIPIRINHA-accelerated 3D-EPI protocol at 530 ms temporal and 2...
September 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28922113/force-based-representation-for-non-rigid-shape-and-elastic-model-estimation
#4
Antonio Agudo, Francesc Moreno-Noguer
This paper addresses the problem of simultaneously recovering 3D shape, pose and the elastic model of a deformable object from only 2D point tracks in a monocular video. This is a severely under-constrained problem that has been typically addressed by enforcing the shape or the point trajectories to lie on low-rank dimensional spaces. We show that formulating the problem in terms of a low-rank force space that induces the deformation and introducing the elastic model as an additional unknown, allows for a better physical interpretation of the resulting priors and a more accurate representation of the actual object's behavior...
September 15, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28921669/respiratory-variation-in-left-ventricular-cardiac-function-with-3d-double-golden-angle-whole-heart-cine-imaging
#5
Karen Holst, Martin Ugander, Andreas Sigfridsson
PURPOSE: To develop a 3-dimensional free-breathing cardiovascular MR technique for quantifying the variation in left ventricular end-diastolic volume (LVEDV) during the respiratory cycle. METHODS: A 3-dimensional radial trajectory with double golden-angle ordering was used for free-running data acquisition during free breathing in healthy volunteers (N = 8). A respiratory self-gating signal was extracted from the center of k-space, and data were retrospectively binned into eight respiratory phases in end-diastole...
September 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28919854/pranas-a-new-platform-for-retinal-analysis-and-simulation
#6
Bruno Cessac, Pierre Kornprobst, Selim Kraria, Hassan Nasser, Daniela Pamplona, Geoffrey Portelli, Thierry Viéville
The retina encodes visual scenes by trains of action potentials that are sent to the brain via the optic nerve. In this paper, we describe a new free access user-end software allowing to better understand this coding. It is called PRANAS (https://pranas.inria.fr), standing for Platform for Retinal ANalysis And Simulation. PRANAS targets neuroscientists and modelers by providing a unique set of retina-related tools. PRANAS integrates a retina simulator allowing large scale simulations while keeping a strong biological plausibility and a toolbox for the analysis of spike train population statistics...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28918063/a-pca-based-method-for-determining-craniofacial-relationship-and-sexual-dimorphism-of-facial-shapes
#7
Wuyang Shui, Mingquan Zhou, Steve Maddock, Taiping He, Xingce Wang, Qingqiong Deng
Previous studies have used principal component analysis (PCA) to investigate the craniofacial relationship, as well as sex determination using facial factors. However, few studies have investigated the extent to which the choice of principal components (PCs) affects the analysis of craniofacial relationship and sexual dimorphism. In this paper, we propose a PCA-based method for visual and quantitative analysis, using 140 samples of 3D heads (70 male and 70 female), produced from computed tomography (CT) images...
September 7, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28915413/transmission-electron-microscopy-studies-and-modeling-of-3d-reciprocal-space-of-%C3%AF-forming-alloy
#8
Alphy George, Vinayak Sharma, R Divakar, M Sabeena, E Mohandas
Initial stage of ω phase formation and associated anomalous features that appear in diffraction patterns of a metastable β transition metal alloy have been investigated in this study with the aid of transmission electron microscopy, simulation and modeling. The paper explores discrete features that emerge in selected area diffraction patterns of quenched Ti-15wt%Mo alloy and analyzes the correlation between ω reflections and diffuse arcs by considering all variants of ω phase as per the formation kinetics of ω phase in β matrix while quenching...
September 12, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28913728/shoulder-strengthening-exercises-adapted-to-specific-shoulder-pathologies-can-be-selected-using-new-simulation-techniques-a-pilot-study
#9
Caecilia Charbonnier, Alexandre Lädermann, Bart Kevelham, Sylvain Chagué, Pierre Hoffmeyer, Nicolas Holzer
PURPOSE: Shoulder strength training exercises represent a major component of rehabilitation protocols designed for conservative or postsurgical management of shoulder pathologies. Numerous methods are described for exercising each shoulder muscle or muscle group. Limited information is available to assess potential deleterious effects of individual methods with respect to specific shoulder pathologies. Thus, the goal of this pilot study was to use a patient-specific 3D measurement technique coupling medical imaging and optical motion capture for evaluation of a set of shoulder strength training exercises regarding glenohumeral, labral and subacromial compression, as well as elongation of the rotator cuff muscles...
September 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28913286/treatment-of-nonsyndromic-craniosynostosis-using-multi-split-osteotomy-and-rigid-fixation-with-absorbable-plates
#10
Su Bong Nam, Kyeong Wook Nam, Jae Woo Lee, Kyeong Ho Song, Yong Chan Bae
BACKGROUND: Nonsyndromic craniosynostosis is a relatively common craniofacial anomaly and various techniques were introduced to achieve its operative goals. Authors found that by using smaller bone fragments than that used in conventional cranioplasty, sufficiently rigid bone union and effective regeneration capacity could be achieved with better postoperative outcome, only if their stable fixation was ensured. METHODS: Through bicoronal incisional approach, involved synostotic cranial bone together with its surrounding areas were removed...
December 2016: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28912739/contextual-cueing-effect-in-spatial-layout-defined-by-binocular-disparity
#11
Guang Zhao, Qian Zhuang, Jie Ma, Shen Tu, Qiang Liu, Hong-Jin Sun
Repeated visual context induces higher search efficiency, revealing a contextual cueing effect, which depends on the association between the target and its visual context. In this study, participants performed a visual search task where search items were presented with depth information defined by binocular disparity. When the 3-dimensional (3D) configurations were repeated over blocks, the contextual cueing effect was obtained (Experiment 1). When depth information was in chaos over repeated configurations, visual search was not facilitated and the contextual cueing effect largely crippled (Experiment 2)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28910766/light-field-compression-with-disparity-guided-sparse-coding-based-on-structural-key-views
#12
Jie Chen, Junhui Hou, Lap-Pui Chau
Recent imaging technologies are rapidly evolving for sampling richer and more immersive representations of the 3D world. One of the emerging technologies is light field (LF) cameras based on micro-lens arrays. To record the directional information of the light rays, a much larger storage space and transmission bandwidth are required by a LF image as compared with a conventional 2D image of similar spatial dimension. Hence, the compression of LF data becomes a vital part of its application. In this paper, we propose a LF codec with disparity guided Sparse Coding over a learned perspective-shifted LF dictionary based on selected Structural Key Views (SC-SKV)...
September 8, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28910577/subnuclear-distribution-of-proteins-links-with-genome-architecture
#13
Fouziya R Shah, Younus A Bhat, Ajazul H Wani
Metazoan genomes have a hierarchal 3-dimensional (3D) organization scaling from nucleosomes, loops, topologically associating domains (TADs), compartments, to chromosome territories. The 3D organization of genome has been linked with development, differentiation and disease. However, the principles governing the 3D chromatin architecture are just beginning to get unraveled. The nucleus has very high concentration of proteins and these proteins are either diffusely distributed throughout the nucleus, or aggregated in the form of foci/bodies/clusters/speckles or in combination of both...
September 14, 2017: Nucleus
https://www.readbyqxmd.com/read/28910382/refining-experimental-dental-implant-testing-in-the-g%C3%A3-ttingen-minipig-using-3d-computed-tomography-a-morphometric-study-of-the-mandibular-canal
#14
Giuliano M Corte, Johanna Plendl, Hana Hünigen, Kenneth C Richardson, Ole Gemeinhardt, Stefan M Niehues
This study reports morphometric and age-related data of the mandibular canal and the alveolar ridge of the Göttingen Minipig to avoid complications during in vivo testing of endosseus dental implants and to compare these data with the human anatomy. Using 3D computed tomography, six parameters of the mandibular canal as well as the alveolar bone height and the alveolar ridge width were measured in Göttingen Minipigs aged 12, 17 and 21 months. Our null hypothesis assumes that the age and the body mass have an influence on the parameters measured...
2017: PloS One
https://www.readbyqxmd.com/read/28906523/low-temperature-flux-syntheses-of-ultraviolet-transparent-borophosphates-na4mb2p3o13-m-rb-cs-exhibiting-a-second-harmonic-generation-response
#15
Chao Wu, Longhua Li, Gang Yang, Junling Song, Bing Yan, Mark G Humphrey, Long Zhang, Jianda Shao, Chi Zhang
The first non-centrosymmetric mixed-alkali-metal borophosphates, Na4MB2P3O13 (M = Rb 1, Cs 2), were obtained using a low-temperature flux method. Single-crystal X-ray diffraction studies of 1 and 2 reveal that the two compounds are isostructural, both crystallizing in the orthorhombic space group Pna21; their structures consist of novel 1D borophosphate chains constructed from B2P3O14 fundamental building units, assembled into a 3D framework by alkali metal cations. Second-harmonic generation (SHG) measurements show that 1 and 2 are type-I phase-matchable, with SHG responses ca...
September 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28906434/surface-profiling-and-core-evaluation-of-aluminum-honeycomb-sandwich-aircraft-panels-using-multi-frequency-eddy-current-testing
#16
Tyler Reyno, P Ross Underhill, Thomas W Krause, Catharine Marsden, Diane Wowk
Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high-resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology...
September 14, 2017: Sensors
https://www.readbyqxmd.com/read/28905385/synthetic-breast-phantoms-from-patient-based-eigenbreasts
#17
Gregory M Sturgeon, Subok Park, William Paul Segars, Joseph Y Lo
PURPOSE: The limited number of 3D patient-based breast phantoms available could be augmented by synthetic breast phantoms in order to facilitate virtual clinical trials using model observers for breast imaging optimization and evaluation. METHODS: These synthetic breast phantoms were developed using Principal Component Analysis (PCA) to reduce the number of dimensions needed to describe a training set of images. PCA decomposed a training set of M breast CT volumes (with millions of voxels each) into an M-1-dimensional space of eigenvectors, which we call eigenbreasts...
September 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28904957/echocardiographic-techniques-of-deformation-imaging-in-the-evaluation-of-maternal-cardiovascular-system-in-patients-with-complicated-pregnancies
#18
REVIEW
Silvia Visentin, Chiara Palermo, Martina Camerin, Luciano Daliento, Denisa Muraru, Erich Cosmi, Luigi P Badano
Cardiovascular diseases (CVD) represent the leading cause of maternal mortality and morbidity. Knowledge of CVD in women is constantly evolving and data are emerging that female-specific risk factors as complications of pregnancy are conditions associated with an increased risk for the long-term development of CVD. Echocardiography is a safe and effective imaging technique indicated in symptomatic or asymptomatic pregnant women with congenital heart diseases who require close monitoring of cardiac function...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28901355/two-dimensional-metal-nacu6-3sb3-and-solid-state-transformations-of-sodium-copper-antimonides
#19
B Owens-Baird, S Lee, K Kovnir
A novel layered compound, NaCu6.3Sb3, has been successfully synthesized from elements. This unique structure crystallizes in the hexagonal space group P63/mmc and has lattice constants of a = 4.2166(2) Å and c = 24.041(1) Å. The structure consists of complex Cu/Sb 2D blocks separated by Na ions. These blocks contain graphene-like hexagonal layers of either Cu or CuSb. The solid-state transformations in the Na-Cu-Sb system between Cu2Sb-NaCu6.3Sb3-NaCu4Sb2 were explored using annealing at different partial vapor pressures of Na, differential scanning calorimetry, and in situ synchrotron powder X-ray diffraction...
September 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28895564/frontiers-in-robot-assisted-retroperitoneal-oncological-surgery
#20
REVIEW
Wesley W Ludwig, Michael A Gorin, Phillip M Pierorazio, Mohamad E Allaf
Robot assistance has been rapidly adopted by urological surgeons and has become particularly popular for oncological procedures involving the retroperitoneal space. The wide dissemination of robot assistance probably reflects the limited amount of operating space available within the retroperitoneum and the advantages provided by robot-assisted approaches, including 3D imaging, wristed instrumentation and the shorter learning curve compared with that associated with the equivalent laparoscopic techniques. Surgical procedures that have traditionally been performed using an open or laparoscopic approach, such as partial nephrectomy, radical nephrectomy, retroperitoneal lymph node dissection, nephroureterectomy and adrenalectomy, are now often being performed using robot assistance...
September 12, 2017: Nature Reviews. Urology
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