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Imaging efficiency measures

Sam Osseiran, Elisabeth M Roider, Hequn Wang, Yusuke Suita, Michael Murphy, David E Fisher, Conor L Evans
Chemical sun filters are commonly used as active ingredients in sunscreens due to their efficient absorption of ultraviolet (UV) radiation. Yet, it is known that these compounds can photochemically react with UV light and generate reactive oxygen species and oxidative stress in vitro, though this has yet to be validated in vivo. One label-free approach to probe oxidative stress is to measure and compare the relative endogenous fluorescence generated by cellular coenzymes nicotinamide adenine dinucleotides and flavin adenine dinucleotides...
December 2017: Journal of Biomedical Optics
Nabil Bouazizi, Radhouane Bargougui, Pascal Thebault, Thomas Clamens, Florie Desriac, Flavia Fioresi, Guy Ladam, Sandrine Morin-Grognet, Nadine Mofaddel, Olivier Lesouhaitier, Franck Le Derf, Julien Vieillard
This article reports the synthesis and functionalization of a novel CuO@SiO2-APTES@Ag0 core-shell-shell material using a simple and low-cost process. The growth, design strategies and synthesis approach are the key factors for the development of CuO@SiO2-APTES@Ag0 as efficient material with enhanced antibacterial activity. We investigated the morphology, surface charge, structure and stability of our new core-shell-shell by atomic force microscopy, scanning electron microscopy, energy dispersive X-ray, Fourier transform infrared and UV-visible spectroscopies, zeta potential measurements, and differential scanning calorimetry...
December 2, 2017: Journal of Colloid and Interface Science
Wan Jae Dong, Chul Jong Yoo, Jong-Lam Lee
Nanostructured metal catalysts to convert CO2 to formate, which have been extensively studied over decades, have many problems such as durability, lifetime, high process temperature, and difficulty in controlling the morphology of nanostructures. Here, we report a facile method to fabricate monolithic nanoporous In-Sn alloy, a network of nanopores, induced by electroreduction of indium tin oxide nanobranches (ITO BRs). The electroreduction process concentrated a local electric field at the tip of the nanostructure, leading to current-assisted joule-heating to form a nanoporous In-Sn alloy...
December 8, 2017: ACS Applied Materials & Interfaces
Ehsan Samei, Lynda C Ikejimba, Brian P Harrawood, John Rong, Ian A Cunningham, Michael J Flynn
PURPOSE: The AAPM Task Group 162 aimed to provide a standardized approach for the assessment of image quality in planar imaging systems. This report offers a description of the approach as well as the details of the resultant software bundle to measure detective quantum efficiency (DQE) as well as its basis components and derivatives. METHODS: The methodology and the associated software include the characterization of the noise power spectrum (NPS) from planar images acquired under specific acquisition conditions, modulation transfer function (MTF) using an edge test object, the DQE, and effective DQE (eDQE)...
December 8, 2017: Medical Physics
Katrin Bauer, Eliram Nof, Josué Sznitman
BACKGROUND: High frequency oscillatory ventilation is often used for lung support in premature neonates suffering from respiratory distress syndrome. Despite its broad use in neonatal intensive care units, there are to date no accepted protocols for the choice of appropriate ventilation parameter settings. In this context, the underlying mass transport mechanisms are still not fully understood. METHODS: We revisit the question of flow phenomena under conventional mechanical ventilation and high frequency oscillatory ventilation in an anatomically-inspired model of neonatal conductive airways spanning the first few airway generations...
November 28, 2017: Clinical Biomechanics
Georgia Keramida, Emma Wroe, Nicola Winterman, Mark Aplin, A Michael Peters
Background Following convection from blood capillaries, plasma proteins are transported to loco-regional lymph nodes in two stages: first, uptake into peripheral lymphatics, and second, transport to nodes. Purpose To introduce a new parameter of lymphatic function that quantifies stage 2 - lymphatic drainage efficiency (LDE). Material and Methods Percentage injected activity (IIQ) in ilio-inguinal nodes 150 min following subcutaneous foot web-space injection of Tc-99 m-nanocolloid was measured in 102 patients undergoing lymphoscintigraphy using a method in which a standard is placed by image guidance over the nodes...
January 1, 2017: Acta Radiologica
Hyeon-Cheol Park, Jessica Mavadia-Shukla, Wu Yuan, Milad Alemohammad, Xingde Li
We report the development of a broadband rotary joint for high-speed ultrahigh-resolution endoscopic optical coherence tomography (OCT) imaging in the 800 nm spectral range. This rotary joint features a pair of achromatic doublets in order to achieve broadband operation for a 3 dB bandwidth over 150 nm. The measured one-way throughput of the rotary joint is greater than 80%, while the fluctuation of the double-pass coupling efficiency during 360 deg rotation is less than ±5% at a near video-rate speed of 20 revolutions/s (rps)...
December 1, 2017: Optics Letters
Roxana Rezvani Naraghi, Heath Gemar, Mahed Batarseh, Andre Beckus, George Atia, Sergey Sukhov, Aristide Dogariu
Spatial coherence function (SCF) is a complex function of two spatial coordinates that, in general, carries more information than the bare intensity distribution. A fast and quantitatively accurate measurement of the SCF is extremely important for a range of applications in optical sensing and imaging. Here, we demonstrate an efficient two-step procedure for measuring the full-field complex coherence function. The measurement relies on an optimized design of a wavefront shearing interferometer capable of characterizing spatially inhomogeneous fields over an extended angular domain...
December 1, 2017: Optics Letters
Hai Li, Xianmin Zhang, Benliang Zhu, Yihua Lu, Heng Wu
This study presents a method for micro-motion detection of the three-degrees-of-freedom (3-DOF; x, y, θz) precision positioning stage (PPS) based on iterative optimized template matching (IOTM). In this method, a micro-vision system (MVS) is constructed and employed to capture magnified images of the measured PPS's surface with high quality. In addition, an efficient and accurate IOTM algorithm, which includes a pyramid hierarchical matching step for generating the initial guess and an iterative searching step for 3-DOF fine matching, is proposed to detect the micro-motion of the 3-DOF PPS...
December 1, 2017: Applied Optics
Adrian Elmi Terander, Rami Nachabe, Halldor Skulason, Kyrre Pedersen, Michael Söderman, John Racadio, Drazenko Babic, Paul Gerdhem, Erik Edström
STUDY DESIGN: Cadaveric laboratory study. OBJECTIVE: To assess the feasibility and accuracy of minimally invasive thoracolumbar pedicle screw placement using augmented reality (AR) surgical navigation SUMMARY OF BACKGROUND DATA.: Minimally invasive spine (MIS) surgery has increasingly become the method of choice for a wide variety of spine pathologies. Navigation technology based on AR has been shown to be feasible, accurate and safe in open procedures. AR technology may also be used for MIS surgery...
December 5, 2017: Spine
Jun-Ge Liang, Cong Wang, Zhao Yao, Ming-Qing Liu, Hong-Ki Kim, Jong-Min Oh, Nam-Young Kim
Aerosol deposition (AD) is a novel ceramic film preparation technique exhibiting the advantages of room-temperature operation and highly efficient film growth. Despite these advantages, AD has not been used for preparing humidity-sensing films. Herein, room-temperature AD was utilized to deposit BaTiO3 films on a glass substrate with a Pt interdigital capacitor, and their humidity sensing performances were evaluated in detail, with further optimization performed by post-annealing at temperatures of 100, 200, ...
December 7, 2017: ACS Applied Materials & Interfaces
Joshua C Chang, Yanli Liu, Tom Chou
We develop a method to reconstruct, from measured displacements of an underlying elastic substrate, the spatially dependent forces that cells or tissues impart on it. Given newly available high-resolution images of substrate displacements, it is desirable to be able to reconstruct small-scale, compactly supported focal adhesions that are often localized and exist only within the footprint of a cell. In addition to the standard quadratic data mismatch terms that define least-squares fitting, we motivate a regularization term in the objective function that penalizes vectorial invariants of the reconstructed surface stress while preserving boundaries...
December 5, 2017: Biophysical Journal
Tianle Guo, Siddharth Sampat, Sara M Rupich, Jennifer A Hollingsworth, Matthew Buck, Han Htoon, Yves J Chabal, Yuri N Gartstein, Anton V Malko
Observation of energy transfer (ET) from multiexcitonic (MX) complexes in nanocrystal quantum dots (NQDs) has been severely restricted due to efficient nonradiative Auger recombination leading to very low MX emission quantum yields. Here we employed "giant" CdSe/CdS NQDs with suppressed Auger recombination to study ET of biexcitons (BX) and charged excitons (trions) into Si substrate. Photoluminescence (PL) measurements of (sub)monolayers of gNQDs controllably assembled on various interacting surfaces and augmented by single gNQD's imaging reveal appearance of BX spectral signatures and progressive acceleration of PL lifetimes of all excitonic species on Si substrates...
December 5, 2017: Nanoscale
Jessica A Savage, Sierra D Beecher, Laura Clerx, Jessica T Gersony, Jan Knoblauch, Juan M Losada, Kaare H Jensen, Michael Knoblauch, N Michele Holbrook
Trees present a critical challenge to long-distance transport because as a tree grows in height and the transport pathway increases in length, the hydraulic resistance of the vascular tissue should increase. This has led many to question whether trees can rely on a passive transport mechanism to move carbohydrates from their leaves to their roots. Although species that actively load sugars into their phloem, such as vines and herbs, can increase the driving force for transport as they elongate, it is possible that many trees cannot generate high turgor pressures because they do not use transporters to load sugar into the phloem...
December 2017: Nature Plants
Dustin M Thomas, Matthew R Minor, James K Aden, Christopher J Lisanti, Kevin E Steel
BACKGROUND: Adenosine or regadenoson vasodilator stress cardiovascular magnetic resonance (CMR) is an effective non-invasive strategy for evaluating symptomatic coronary artery disease. Vasodilator injection typically precedes ventricular functional sequences to efficiently reduce overall scanning times, though the effects of vasodilators on CMR-derived ventricular volumes and function are unknown. METHODS: We prospectively enrolled 25 healthy subjects to undergo consecutive adenosine and regadenoson administration...
December 4, 2017: Journal of Cardiovascular Magnetic Resonance
Guorong She, Ziqi Zhou, Zhengang Zha, Fei Wang, Xiaoting Pan
Subchondral bone reabsorption and remodeling are responsible for the initiation and progression of osteoarthritis (OA). Zoledronic acid (ZOL), a third-generation bisphosphonate (BIS), is an inhibitor of bone reabsorption. However, the intervention effect of ZOL on OA has not been fully characterized and remains to be directly demonstrated in animal experiments. The present study examined the microscopic and macroscopic changes in the anterior cruciate ligament transection (ACLT) model of OA in rabbits and evaluated the effects of ZOL on cartilage degeneration and subchondral bone loss...
November 2017: Experimental and Therapeutic Medicine
M S R Murthy, Hammad Gilani, Bhaskar Singh Karky, Eklabya Sharma, Marieke Sandker, Upama Ashish Koju, Shiva Khanal, Mohan Poudel
BACKGROUND: The reliable monitoring, reporting and verification (MRV) of carbon emissions and removals from the forest sector is an important part of the efforts on reducing emissions from deforestation and forest degradation (REDD+). Forest-dependent local communities are engaged to contribute to MRV through community-based monitoring systems. The efficiency of such monitoring systems could be improved through the rational integration of the studies at permanent plots with the geospatial technologies...
December 1, 2017: Carbon Balance and Management
Ajit Appari, M Eric Johnson, Denise L Anthony
OBJECTIVE: To determine whether the use of information technology (IT), measured by Meaningful Use capability, is associated with lower rates of inappropriate utilization of imaging services in hospital outpatient settings. RESEARCH DESIGN: A retrospective cross-sectional analysis of 3332 nonfederal U.S. hospitals using data from: Hospital Compare (2011 outpatient imaging efficiency measures), HIMSS Analytics (2009 health IT), and Health Indicator Warehouse (market characteristics)...
January 2018: International Journal of Medical Informatics
Ashaparna Mondal, Sourav De, Santanu Maiti, Bidisha Sarkar, Ashok Kumar Sk, Rini Jacob, Anbalagan Moorthy, Priyankar Paira
A series of Ruthenium-Quinolinol complexes (3a-d &4a-d) has been synthesized by employing a simple, efficient and environmental friendly condition. Catalytic role of Amberlite IRA-120(H) has been demonstrated. The structures of the new compounds were elucidated by the analysis of spectroscopic data. The stability of these complexes was measured by UV spectroscopy & time dependent NMR spectroscopy. These newly developed complexes were represented as potential anticancer agent against human breast carcinoma cell line (MCF-7), human Epitheloid Cervix Carcinoma (HeLa), human lung adenocarcinoma epithelial cell line (A549) and human colon cancer cell line (Caco-2)...
November 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
Vincent Floré, Adam J Brown, Stephen J Pettit, Nick Ej West, Clive Lewis, Jayan Parameshwar, Stephen P Hoole
MAIN PROBLEM: Cardiac allograft vasculopathy (CAV) can be detected early with intravascular ultrasound (IVUS) but there is limited information on the most efficient imaging protocol. METHODS: Coronary angiography and IVUS of the 3 coronary arteries were performed. Volumetric IVUS analysis was performed and a Stanford grade determined for each vessel. RESULTS: 18 patients were included 18 (range 12-24) months after transplantation. Angiographic CAV severity ranged from none (CAV0) to mild (CAV1) whereas IVUS CAV severity ranged from none (Stanford grade I) to severe (grade IV)...
November 30, 2017: Clinical Transplantation
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