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https://www.readbyqxmd.com/read/28434071/repeatability-and-agreement-of-central-corneal-thickness-measurement-with-non-contact-methods-a-comparative-study
#1
Tarannum Mansoori, Nagalla Balakrishna
PURPOSE: To compare the central corneal thickness (CCT) measurements and reliability of RTVue XR-100 anterior segment optical coherence tomography (AS-OCT), AL-scan optical biometer and Schwind Sirius anterior segment analysis system. METHODS: The CCT was measured in one hundred and twenty-seven eyes of 127 healthy subjects with AS-OCT, AL-scan and Sirius system. Mean CCT was compared among the instruments, and the level of agreement was assessed using Bland-Altman plots...
April 22, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28434022/effects-of-vestibular-disorders-on-vestibular-reflex-and-imagery
#2
B S Cohen, J Provasi, P Leboucher, I Israël
The aim of this study was to establish the effect of vestibular lesion on vestibular imagery. Subjects were required to estimate verbally their passively travelled rotation angles in complete darkness, i.e., to activate vestibular imagery. During motion, the vestibulo-ocular reflex (VOR) was measured. Thus, we examined the coherence between the vestibulo-ocular reflex and self-rotation imagery, with vestibular-lesioned patients and healthy participants. Unilateral acute and chronic patients, bilateral patients, and healthy subjects were compared...
April 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28433988/comparison-of-choriocapillaris-flow-measurements-between-two-optical-coherence-tomography-angiography-devices
#3
Jost L Lauermann, Peter Heiduschka, Pieter Nelis, Maximilian Treder, Maged Alnawaiseh, Christoph R Clemens, Nicole Eter, Florian Alten
PURPOSE: To evaluate choriocapillaris (CC) perfusion in healthy subjects using 2 different optical coherence tomography angiography (OCT-A) devices. PROCEDURES: Macular OCT-A imaging (36 eyes of 36 subjects) was performed using Optovue AngioVue and Zeiss AngioPlex devices. CC decorrelation signal index was assessed, and CC data were analyzed regarding intra-device variability, inter-device correlation, age, signal strength, and fields of view. RESULTS: The intra-device variability of CC measurements in the 3 × 3 mm2 field was 5...
April 22, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/28433757/surgical-volunteerism-or-voluntourism-are-we-doing-more-harm-than-good
#4
EDITORIAL
Faheem Ahmed, Madeline Grade, Carl Malm, Sophia Michelen, Na'eem Ahmed
The significant rise in the number of international health electives undertaken by medical students and doctors in the US, Canada and UK reflects acknowledgement of the inter-connected nature of these challenges to health systems and the drive to help solve them. However, the next generation of international volunteers often operate under a conflicting duality: whilst many of their role models have devoted their lives to global health following a similar volunteering experience, there are pervasive ethical problems associated with short-term global health work that must be identified and addressed to ensure positive outcomes for all parties involved...
April 19, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28433753/computational-image-analysis-for-prognosis-determination-in-dme
#5
Bianca S Gerendas, Hrvoje Bogunovic, Amir Sadeghipour, Thomas Schlegl, Georg Langs, Sebastian M Waldstein, Ursula Schmidt-Erfurth
In this pilot study, we evaluated the potential of computational image analysis of optical coherence tomography (OCT) data to determine the prognosis of patients with diabetic macular edema (DME). Spectral-domain OCT scans with fully automated retinal layer segmentation and segmentation of intraretinal cystoid fluid (IRC) and subretinal fluid of 629 patients receiving anti-vascular endothelial growth factor therapy for DME in a randomized prospective clinical trial were analyzed. The results were used to define 312 potentially predictive features at three timepoints (baseline, weeks 12 and 24) for best-corrected visual acuity (BCVA) at baseline and after one year used in a random forest prediction path...
April 19, 2017: Vision Research
https://www.readbyqxmd.com/read/28433536/assessment-of-enamel-cracks-at-adhesive-cavosurface-margin-using-three-dimensional-swept-source-optical-coherence-tomography
#6
Tomoko Tabata, Yasushi Shimada, Alireza Sadr, Junji Tagami, Yasunori Sumi
OBJECTIVES: Swept-source optical coherence tomography (SS-OCT) can construct cross-sectional images of internal biological structures. The aim of this study was to evaluate enamel cracks at the cavosurface margin of composite restorations using SS-OCT. METHODS: Bowl-shaped cavities were prepared at two locations (mid-coronal and cervical regions) on the enamel surface of 60 bovine teeth. Half of the cavities (30) were treated with phosphoric acid gel. A two-step self-etch adhesive (Clearfil SE Bond) was applied to all cavities and a flowable composite was placed in bulk...
April 19, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28433445/parapapillary-choroidal-microvasculature-dropout-in-glaucoma-a-comparison-between-optical-coherence-tomography-angiography-and-indocyanine-green-angiography
#7
Eun Ji Lee, Kyoung Min Lee, Seung Hyen Lee, Tae-Woo Kim
PURPOSE: To investigate whether the parapapillary choroidal microvasculature dropout (MvD) determined by optical coherence tomography angiography (OCTA) in glaucomatous eyes indicates a true perfusion defect and whether the MvD accurately represents the area of nonperfusion. DESIGN: Observational case series. PARTICIPANTS: Thirty primary open-angle glaucoma (POAG) patients with choroidal MvD as determined by OCTA and 13 POAG patients without this dropout...
April 19, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28433129/swept-source-optical-coherence-tomography-angiography-imaging-in-a-case-of-uveal-melanoma
#8
Marco Pellegrini, Giovanni Staurenghi
No abstract text is available yet for this article.
May 2017: Ophthalmology
https://www.readbyqxmd.com/read/28433123/optical-coherence-tomography-angiography-of-a-central-retinal-artery-occlusion-before-and-after-anterior-chamber-paracentesis
#9
Christopher K Hwang, Anton M Kolomeyer, Alexander J Brucker
No abstract text is available yet for this article.
May 2017: Ophthalmology
https://www.readbyqxmd.com/read/28433038/four-dimensional-coherent-electronic-raman-spectroscopy
#10
Elad Harel
The correlations between different quantum-mechanical degrees of freedom of molecular species dictate their chemical and physical properties. Generally, these correlations are reflected in the optical response of the system but in low-order or low-dimensionality measurement the signals are highly averaged. Here, we describe a novel four-dimensional coherent spectroscopic method that directly correlates within and between the manifold of electronic and vibrational states. The optical response theory is developed in terms of both resonant and non-resonant field-matter interactions...
April 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28432914/adaptive-optimization-of-ultrasound-beamforming-sound-velocity-using-sub-aperture-differential-phase-gradient
#11
Che-Chou Shen, Hsiao-Chi Yang
Ultrasound array imaging systems rely on a presumed beamforming sound velocity to calculate the time compensation of each element for receive focusing. The mismatch between the tissue sound velocity and the beamforming sound velocity can degrade the focusing quality due to loss of phase coherence. Since the tissue sound velocity cannot be known in prior, an adaptive optimization of beamforming sound velocity is required to improve the image quality. Differential phase gradient of channel data is proposed to estimate the optimal sound velocity for beamforming...
April 12, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28432866/shared-genetic-influences-among-childhood-shyness-social-competences-and-cortical-responses-to-emotions
#12
Marco Battaglia, Giorgia Michelini, Elettra Pezzica, Anna Ogliari, Corrado Fagnani, Maria-Antonietta Stazi, Eleonora Bertoletti, Simona Scaini
Visual event-related potentials (ERPs) evoked by facial expressions are useful to map socioemotional responses among shy children and to predict transition into social phobia. We investigated the sources of covariation among childhood shyness, social competences, and ERPs to other children's happy, neutral, and angry expressions. Electrophysiological and twin analyses examined the phenotypic and etiological association among an index of childhood shyness, an index of social competences, and ERP responses to facial expressions in 200 twins (mean age=9...
April 19, 2017: Journal of Experimental Child Psychology
https://www.readbyqxmd.com/read/28432581/comparison-of-immediate-versus-deferred-intravitreal-bevacizumab-in-macular-oedema-due-to-branch-retinal-vein-occlusion-a-pilot-study
#13
M A Khan, Varakutti Mallika, Dattakiran Joshi
PURPOSE: To compare visual and anatomical recovery of immediate versus deferred intravitreal Bevacizumab for the treatment of macular oedema secondary to branch retinal vein occlusion (BRVO). METHODS: In a pilot study, 40 treatment naïve patients of branch retinal vein occlusion with macular oedema and vision 6/12 or less presenting within one month of onset were randomised into 2 groups (20 each) to receive either immediate intravitreal Bevacizumab or deferred (after 3 months of observation)...
April 21, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28432385/bioresorbable-vascular-scaffolds-in-coronary-chronic-total-occlusions-revascularization-safety-assessment-related-to-struts-coverage-and-apposition-in-6-month-oct-follow-up
#14
Rosa Alba Abellas-Sequeiros, Raymundo Ocaranza-Sanchez, Ramiro Trillo-Nouche, Carlos Gonzalez-Juanatey, Jose Ramon Gonzalez-Juanatey
Beneficial properties of bioresorbable vascular scaffolds (BVS) regarding to vasomotility restoration and no caging of the vessel make them attractive devices in chronic total occlusions (CTO) revascularization. However, more evidence is needed attending to their use in this specific setting. We aim to determine feasibility and safety of BVS use in CTO revascularization attending to struts coverage and apposition, as well as re-stenosis and stent thrombosis (ST) rates. 29 BVS were deployed in 9 CTO lesions revascularization (mean J-CTO score ≥3) with an acute procedural success rate of 100%...
April 21, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28432335/policy-coherence-integration-and-proportionality-in-tobacco-control-should-tobacco-sales-be-limited-to-government-outlets
#15
Elizabeth A Smith, Patricia A McDaniel, Heikki Hiilamo, Ruth E Malone
Multiple factors, including marijuana decriminalization/legalization, tobacco endgame discourse, and alcohol industry pressures, suggest that the retail regulatory environment for psychoactive or addictive substances is a dynamic one in which new options may be considered. In most countries, the regulation of tobacco, marijuana, and alcohol is neither coherent, nor integrated, nor proportional to the potential harms caused by these substances. We review the possible consequences of restricting tobacco sales to outlets run by government-operated alcohol retail monopolies, as well as the likely obstacles to such a policy...
April 21, 2017: Journal of Public Health Policy
https://www.readbyqxmd.com/read/28432308/network-aided-bi-clustering-for-discovering-cancer-subtypes
#16
Guoxian Yu, Xianxue Yu, Jun Wang
Bi-clustering is a widely used data mining technique for analyzing gene expression data. It simultaneously groups genes and samples of an input gene expression data matrix to discover bi-clusters that relevant samples exhibit similar gene expression profiles over a subset of genes. The discovered bi-clusters bring insights for categorization of cancer subtypes, gene treatments and others. Most existing bi-clustering approaches can only enumerate bi-clusters with constant values. Gene interaction networks can help to understand the pattern of cancer subtypes, but they are rarely integrated with gene expression data for exploring cancer subtypes...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432184/management-of-a-case-of-myopic-foveoschisis-with-phakic-intraocular-lens-piol-in-situ-intraoperative-challenges
#17
Atul Kumar, Aditi Mehta, Raghav Dinesh Ravani, Prateek Kakkar
We describe the case of a 30-year-old man with pathological myopia with a phakic intraocular lens (IOL) (Visian ICL V4c model; STAAR, Monrovia, California, USA) in situ having complaints of metamorphopsia in the left eye with documented myopic foveoschisis on swept-source optical coherence tomography (DRI OCT Triton; Topcon, Tokyo, Japan). The patient underwent pars plana vitrectomy with internal limiting membrane peeling. This report discusses the intraoperative challenges occurring as a result of increased optical aberrations in the presence of a phakic IOL...
April 20, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28432165/intravitreal-cysticercosis-with-full-thickness-macular-hole-management-outcome-and-intraoperative-optical-coherence-tomography-features
#18
Karthikeya R, Raghav Dinesh Ravani, Prateek Kakkar, Atul Kumar
Ocular cysticercosis is a serious condition with a potential for complete vision loss if left untreated. Intravitreal cysticercosis is the most common ocular form of cysticercosis and is associated with retinal detachment, retinal traction, subretinal scarring and vitritis. To the best of our knowledge, there is no report of the occurrence of a live intravitreal cysticercosis with a full thickness macular hole (FTMH) in the literature. We here report a case of live intravitreal cysticercosis with a FTMH along with its management and intraoperative optical coherence tomography features of the live cysticercus...
April 21, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28432139/feature-selective-attention-adaptively-shifts-noise-correlations-in-primary-auditory-cortex
#19
Joshua Downer, Brittany Rapone, Jessica Verhein, Kevin N O'Connor, Mitchell L Sutter
Sensory environments often contain an overwhelming amount of information, with both relevant and irrelevant information competing for neural resources. Feature attention mediates this competition by selecting the sensory features needed to form a coherent percept. How attention affects the activity of populations of neurons to support this process is poorly understood because population coding is typically studied through simulations in which one sensory feature is encoded without competition. Therefore, to study the effects of feature attention on population-based neural coding, investigations must be extended to include stimuli with both relevant and irrelevant features...
April 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28432111/regional-vascular-density-visual-field-sensitivity-relationship-in-glaucoma-according-to-disease-severity
#20
Joong Won Shin, Jiyun Lee, Junki Kwon, Jaewan Choi, Michael S Kook
AIMS: To study whether there are global and regional relationships between peripapillary vascular density (pVD) assessed by optical coherence tomography angiography (OCT-A) and visual field (VF) mean sensitivity at different glaucoma stages. METHODS: Microvascular images and peripapillary retinal nerve fibre layer (pRNFL) thicknesses were obtained using a Cirrus OCT-A device in 91 glaucoma subjects. The pVD was measured at various spatial locations according to the Garway-Heath map, using a MATLAB software (The MathWorks, Natick, Massachusetts)...
April 21, 2017: British Journal of Ophthalmology
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