keyword
MENU ▼
Read by QxMD icon Read
search

optic flow

keyword
https://www.readbyqxmd.com/read/28822141/applicability-of-quantitative-optical-imaging-techniques-for-intraoperative-perfusion-diagnostics-a-comparison-of-laser-speckle-contrast-imaging-sidestream-dark-field-microscopy-and-optical-coherence-tomography
#1
Sanne M Jansen, Daniel M de Bruin, Dirk J Faber, Iwan J G G Dobbe, Erik Heeg, Dan M J Milstein, Simon D Strackee, Ton G van Leeuwen
Patient morbidity and mortality due to hemodynamic complications are a major problem in surgery. Optical techniques can image blood flow in real-time and high-resolution, thereby enabling perfusion monitoring intraoperatively. We tested the feasibility and validity of laser speckle contrast imaging (LSCI), optical coherence tomography (OCT), and sidestream dark-field microscopy (SDF) for perfusion diagnostics in a phantom model using whole blood. Microvessels with diameters of 50, 100, and 400  μm were constructed in a scattering phantom...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28821834/ocular-fundus-pulsations-within-the-posterior-rat-eye-chorioscleral-motion-and-response-to-elevated-intraocular-pressure
#2
Marco Augustin, Stanislava Fialová, Corinna Fischak, Leopold Schmetterer, Christoph K Hitzenberger, Bernhard Baumann
A multi-functional optical coherence tomography (OCT) approach is presented to determine ocular fundus pulsations as an axial displacement between the retina and the chorioscleral complex in the albino rat eye. By combining optical coherence elastography and OCT angiography (OCTA), we measure subtle deformations in the nanometer range within the eye and simultaneously map retinal and choroidal perfusion. The conventional OCT reflectivity contrast serves as a backbone to segment the retina and to define several slabs which are subsequently used for quantitative ocular pulsation measurements as well as for a qualitative exploration of the multi-functional OCT image data...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819699/cudc-907-a-dual-hdac-and-pi3k-inhibitor-reverses-platinum-drug-resistance
#3
Kenneth K W To, Li-Wu Fu
Platinum (Pt)-based anticancer drugs are the mainstay of treatment for solid cancers. However, resistance to Pt drugs develops rapidly, which can be caused by overexpression of multidrug resistance transporters and activation of DNA repair. CUDC-907 is a potent molecular targeted anticancer agent, rationally designed to simultaneously inhibit histone deacetylase (HDAC) and phosphatidylinositol 3-kinase (PI3K). We investigated the potentiation effect of CUDC-907 on Pt drugs in resistant cancer cells. ABCC2 stably-transfected HEK293 cells and two pairs of parental and Pt-resistant cancer cell lines were used to test for the circumvention of resistance by CUDC-907...
August 17, 2017: Investigational New Drugs
https://www.readbyqxmd.com/read/28818663/a-lightweight-inexpensive-robotic-system-for-insect-vision
#4
Chelsea Sabo, Robert Chisholm, Adam Petterson, Alex Cope
Designing hardware for miniaturized robotics which mimics the capabilities of flying insects is of interest, because they share similar constraints (i.e. small size, low weight, and low energy consumption). Research in this area aims to enable robots with similarly efficient flight and cognitive abilities. Visual processing is important to flying insects' impressive flight capabilities, but currently, embodiment of insect-like visual systems is limited by the hardware systems available. Suitable hardware is either prohibitively expensive, difficult to reproduce, cannot accurately simulate insect vision characteristics, and/or is too heavy for small robotic platforms...
August 14, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28816546/determination-of-topographic-variations-in-inner-retinal-blood-flow-areas-in-young-chinese-subjects-using-optical-coherence-tomography-angiography
#5
Minwen Zhou, Bing Lu, Pengfei Zhang, Jingke Zhao, Qiu Wang, Xiaodong Sun
PURPOSE: To investigate (i) topographic variations in, and (ii) establish references for, inner retinal blood flow areas of the macular region of young Chinese subjects by means of optical coherence tomography (OCT) angiography. METHODS: To measure inner retinal blood flow areas, we scanned an 8 × 8 mm(2) area and centered on the fovea of 336 eyes from 170 subjects using OCT angiography. Blood flow area measurements were made from a 1-mm radius circle, centered on the fovea, and 3 mm to the fovea superiorly, inferiorly, temporally, and nasally...
August 17, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28816483/effect-of-travel-speed-on-the-visual-control-of-steering-toward-a-goal
#6
Rongrong Chen, Diederick C Niehorster, Li Li
Previous studies have proposed that people can use visual cues such as the instantaneous direction (i.e., heading) or future path trajectory of travel specified by optic flow or target visual direction in egocentric space to steer or walk toward a goal. In the current study, we examined what visual cues people use to guide their goal-oriented locomotion and whether their reliance on such visual cues changes as travel speed increases. We presented participants with optic flow displays that simulated their self-motion toward a target at various travel speeds under two viewing conditions in which we made target egocentric direction available or unavailable for steering...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28814415/optical-coherence-tomography-angiography-enhances-the-detection-of-optic-nerve-damage-in-multiple-sclerosis
#7
Rebecca I Spain, Liang Liu, Xinbo Zhang, Yali Jia, Ou Tan, Dennis Bourdette, David Huang
BACKGROUND: Quantitative assessment of optic nerve damage is important in the evaluation of optic neuritis (ON) and multiple sclerosis (MS). OBJECTIVE: To detect optic nerve damage using optical coherence tomography (OCT) and OCT angiography in MS. METHODS: Peripapillary retinal nerve fibre layer (NFL) thickness, macular ganglion cell complex (GCC) thickness and Optic Nerve Head Flow Index (ONH-FI) were measured. The ONH-FI was defined as flow signal averaged over the optic disc...
August 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28811568/dynamic-x-ray-radiography-reveals-particle-size-and-shape-orientation-fields-during-granular-flow
#8
François Guillard, Benjy Marks, Itai Einav
When granular materials flow, the constituent particles segregate by size and align by shape. The impacts of these changes in fabric on the flow itself are not well understood, and thus novel non-invasive means are needed to observe the interior of the material. Here, we propose a new experimental technique using dynamic X-ray radiography to make such measurements possible. The technique is based on Fourier transformation to extract spatiotemporal fields of internal particle size and shape orientation distributions during flow, in addition to complementary measurements of velocity fields through image correlation...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810657/anti-exudation-effects-of-sodium-ferulate-and-oxymatrine-combination-via-modulation-of-aquaporin-1
#9
Songmei Sun, Xing Du, Mengxin Xu, Meijuan Liu, Zhifeng Liu
The present study aimed to investigate the anti-exudative effects of sodium ferulate combined with oxymatrine in a mouse model of acetic acid-induced peritonitis. Furthermore, the underlying mechanisms were explored by determining the effects of these drugs on the volume and aquaporin 1 (AQP1) expression in vascular endothelial cells on omentum majus and human umbilical vein endothelial cells (HUVEC). Treatment with sodium ferulate combined with oxymatrine was shown to significantly inhibit acetic acid-induced vascular permeability in the peritonitis model mice and furthermore to significantly decrease the optical density of Evans blue, the leukocyte number and the levels of interleukin-6, C-reactive protein and interferon-γ in peritoneal lavage fluid...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810047/optical-coherence-tomography-angiography-of-retinal-cavernous-hemangioma
#10
Luisa Pierro, Alessandro Marchese, Marco Gagliardi, Francesco Bandello
Retinal cavernous hemangioma is a rare, benign, retinal tumor characterized by angiomatous proliferation of vessels within the inner retina or the optic disc.1 Here we report a case of retinal cavernous hemangioma on the margin of the optic disc in the right eye of a 61-year-old asymptomatic female. The lesion was studied with multimodal imaging which included structural optical coherence tomography, fluorescein angiography, blue fundus auto-fluorescence, optical coherence tomography angiography (OCTA) (DRI OCT Triton; Topcon, Tokyo, Japan) and visual field examination...
August 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28810037/quantitative-features-of-the-choriocapillaris-in-healthy-individuals-using-swept-source-optical-coherence-tomography-angiography
#11
Mayss Al-Sheikh, Khalil Ghasemi Falavarjani, Maximilian Pfau, Akihito Uji, Phillip P Le, SriniVas R Sadda
BACKGROUND AND OBJECTIVE: To quantify vessel density (VD) and grey value (GV) as a measure of flow in the choriocapillaris (CC) in healthy subjects with optical coherence tomography angiography (OCTA). PATIENTS AND METHODS: In this prospective, noncomparative case series, 3 mm × 3 mm OCTA images of 36 eyes of 22 healthy individuals were obtained using a swept-source instrument. VD and GV levels were calculated on CC en face slabs in the central 1-mm (subfoveal field) and surrounding 2...
August 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28810036/evaluation-of-macular-perfusion-in-healthy-smokers-by-using-optical-coherence-tomography-angiography
#12
Ziya Ayhan, Mahmut Kaya, Taylan Ozturk, Omer Karti, F Hakan Oner
BACKGROUND AND OBJECTIVE: To investigate the macular perfusion changes in healthy smokers by using optical coherence tomography angiography (OCTA). PATIENTS AND METHODS: OCTA measurements were taken for the right eyes of 40 smokers (Group 1) and age- and sex-matched control cases (Group 2). Group 1 underwent OCTA scanning with the XR Avanti AngioVue OCTA (Optovue, Fremont, CA) at baseline and at 5 minutes, 30 minutes, and 60 minutes after one standard cigarette smoking...
August 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28809879/zak-phase-induced-multiband-waveguide-by-two-dimensional-photonic-crystals
#13
Yuting Yang, Tao Xu, Yun Fei Xu, Zhi Hong Hang
Interface states in photonic crystals provide efficient approaches to control the flow of light. Photonic Zak phase determines the bulk band properties of photonic crystals, and, by assembling two photonic crystals with different bulk band properties together, deterministic interface states can be realized. By translating each unit cell of a photonic crystal by half the lattice constant, another photonic crystal with identical common gaps but a different Zak phase at each photonic band can be created. By assembling these two photonic crystals together, multiband waveguide can thus be easily created and then experimentally characterized...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28809101/a-microsphere-supported-lipid-bilayer-platform-for-dna-reactions-on-a-fluid-surface
#14
Aurora Fabry-Wood, Madalyn Elise Fetrow, Carl W Brown Iii, Nicholas A Baker, Nadiezda Fernandez Oropeza, Andrew P Shreve, Gabriel A Montano, Darko Stefanovic, Matthew R Lakin, Steven W Graves
We report a versatile microsphere-supported lipid bilayer system that can serve as a general-purpose platform for implementing DNA nanotechnologies on a fluid surface. To demonstrate our platform, we implemented both toehold-mediated strand displacement (TMSD) and DNAzyme reactions, which are typically performed in solution and which are the cornerstone of DNA-based molecular logic and dynamic DNA nanotechnology, on the surface. We functionalized microspheres bearing supported lipid bilayers (µSLBs) with membrane-bound nucleic acid components...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28803065/flow-induced-adherens-junction-remodeling-driven-by-cytoskeletal-forces
#15
Deepika Verma, Vivek K Bajpai, Nannan Ye, Mohammad M Maneshi, Deekshitha Jetta, Stelios T Andreadis, Frederick Sachs, Susan Z Hua
Adherens junctions (AJs) are a key structural component for tissue organization and function. Under fluid shear stress, AJs exhibit dynamic assembly/disassembly, but how shear stress couples to AJs is unclear. In MDCK cells we measured simultaneously the forces in cytoskeletal α-actinin and the density and length of AJs using a genetically coded optical force sensor, actinin-sstFRET, and fluorescently labeled E-cadherin (E-cad). We found that shear stress of 0.74dyn/cm(2) for 3h significantly enhanced E-cad expression at cell-cell contacts and this phenomenon has two phases...
August 10, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28802195/measurements-and-simulation-of-liquid-films-during-drainage-displacements-and-snap-off-in-constricted-capillary-tubes
#16
Sophie Roman, Moataz O Abu-Al-Saud, Tetsu Tokunaga, Jiamin Wan, Anthony R Kovscek, Hamdi A Tchelepi
When a wetting liquid is displaced by air in a capillary tube, a wetting film develops between the tube wall and the air that is responsible for the snap-off mechanism of the gas phase. By dissolving a dye in the wetting phase it is possible to relate a measure of the absorbance in the capillary to the thickness of liquid films. These data could be used to compare with cutting edge numerical simulations of the dynamics of snap-off for which experimental and numerical data are lacking. Drainage experiments in constricted capillary tubes were performed where a dyed wetting liquid is displaced by air for varying flow rates...
July 26, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28800207/optically-derived-metabolic-and-hemodynamic-parameters-predict-hippocampal-neurogenesis-in-the-btbr-mouse-model-of-autism
#17
David Abookasis, Danit Lerman, Hava Roth, Mati Tfilin, Gadi Turgeman
In the present study, we made use of dual-wavelength laser speckle imaging (DW-LSI) to assess cerebral blood flow in the BTBR genetic mouse model of Autism Spectrum Disorder, as well as control (C57Bl/6J) mice. Since the deficits in social behavior demonstrated by BTBR mice are attributed to changes in neural tissue structure and function, we postulated that these changes can be detected optically using DW-LSI. BTBR mice demonstrated reductions in both cerebral blood flow (CBF) and cerebral oxygen metabolism (CMRO2 ), as suggested by studies using conventional neuroimaging technologies to reflect impaired neuronal activation and cognitive function...
August 11, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28798842/a-low-cost-plug-and-play-inertial-microfluidic-helical-capillary-device-for-high-throughput-flow-cytometry
#18
Xiao Wang, Hua Gao, Nadja Dindic, Necati Kaval, Ian Papautsky
Glass capillary tubes have been widely used in microfluidics for generating microdroplets and microfibers. Here, we report on the application of glass capillary to inertial focusing of microparticles and cells for high-throughput flow cytometry. Our device uses a commercially available capillary tube with a square cross-section. Wrapping the tube into a helical shape induces the Dean vortices that aid focusing of cells or microbeads into a single position. We investigated the inertial focusing of microbeads in the device at various Re and concentrations and demonstrated 3D focusing with ∼100% efficiency for a wide range of microparticle diameters...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28797412/optical-coherence-tomography-characterization-of-coronary-lithoplasty-for-treatment-of-calcified-lesions-first-description
#19
Ziad A Ali, Todd J Brinton, Jonathan M Hill, Akiko Maehara, Mitsuaki Matsumura, Keyvan Karimi Galougahi, Uday Illindala, Matthias Götberg, Robert Whitbourn, Nicolas Van Mieghem, Ian T Meredith, Carlo Di Mario, Jean Fajadet
OBJECTIVES: This study sought to determine the mechanistic effects of a novel balloon-based lithoplasty system on heavily calcified coronary lesions and subsequent stent placement using optical coherence tomography (OCT). BACKGROUND: The Shockwave Coronary Rx Lithoplasty System (Shockwave Medical, Fremont, California) delivers localized, lithotripsy-enhanced disruption of calcium within the target lesion (i.e., lithoplasty) for vessel preparation before stent implantation...
August 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28797199/the-power-of-projectomes-genetic-mosaic-labeling-in-the-larval-zebrafish-brain-reveals-organizing-principles-of-sensory-circuits
#20
Estuardo Robles
In no vertebrate species do we possess an accurate, comprehensive tally of neuron types in the brain. This is in no small part due to the vast diversity of neuronal types that comprise complex vertebrate nervous systems. A fundamental goal of neuroscience is to construct comprehensive catalogs of cell types defined by structure, connectivity, and physiological response properties. This type of information will be invaluable for generating models of how assemblies of neurons encode and distribute sensory information and correspondingly alter behavior...
August 10, 2017: Journal of Neurogenetics
keyword
keyword
72619
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"