keyword
MENU ▼
Read by QxMD icon Read
search

adaptative optics

keyword
https://www.readbyqxmd.com/read/28432507/study-of-the-potential-of-barnyard-grass-for-the-remediation-of-cd-and-pb-contaminated-soil
#1
Jianling Xu, Qiongyao Cai, Hanxi Wang, Xuejun Liu, Jing Lv, Difu Yao, Yue Lu, Wei Li, Yuanyuan Liu
In this study, the microwave digestion method was used to determine total cadmium (Cd) and lead (Pb) concentrations, the BCR method was used to determine different states of Cd and Pb, and atomic absorption spectroscopy (AAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) were used to determine Cd and Pb concentrations in simulated soil and barnyard grass before and after planting barnyard grass to provide a theoretical basis for the remediation of Cd- and Pb-contaminated soil. The results showed that the bioconcentration factor changes with different Cd concentrations are relatively complex and that the removal rate increases regularly...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28431469/enhanced-response-time-of-electrowetting-lenses-with-shaped-input-voltage-functions
#2
Omkar D Supekar, Mo Zohrabi, Juliet T Gopinath, Victor M Bright
Adaptive optical lenses, based on the electrowetting principle, are being rapidly implemented in many applications such as microscopy, remote sensing, displays, and optical communication. To characterize the response of these electrowetting lenses, the dependence on DC driving voltage functions was investigated in a low viscosity liquid system. Cylindrical lenses with inner diameter 2.45 and 3.95-mm were used to characterize the dynamic behavior of the liquids under DC voltage electrowetting actuation. By increasing the rise time of the input exponential driving voltage, the originally underdamped system response can be damped, enabling a smooth response from the lens...
April 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28431433/experimental-anterior-ischemic-optic-neuropathy-in-diabetic-mice-exhibited-severe-retinal-swelling-associated-with-vegf-elevation
#3
Ming-Hui Sun, Mohammad Ali Shariati, Yaping Joyce Liao
Purpose: Diabetes mellitus (DM) is one of the most important risk factors for nonarteritic anterior ischemic optic neuropathy (AION). In this study, we investigated for the first time the impact of experimental AION in a DM model. Methods: We induced a photochemical thrombosis model of AION after streptozotocin-induced DM and performed serial optical coherence tomography (OCT), morphometric analyses, and VEGF levels in the retina and sera. Results: Compared with non-DM animals, experimental AION in DM mice led to significantly greater retinal swelling on day 1 and worse thinning at week 3 on OCT measurements...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28430208/illumination-data-transmission-and-energy-harvesting-the-threefold-advantage-of-vlc
#4
Harilaos G Sandalidis, Alexander Vavoulas, Theodoros A Tsiftsis, Nicholas Vaiopoulos
Visible light communication (VLC) is a promising technology that meets illumination and information transmission requirements in an indoor environment. Because light waves convey energy, a VLC link may exploit that fact for energy harvesting purposes. In this context, a single light emitting diode lamp located at a close distance over a tablet or laptop PC can potentially offer simultaneous lighting, Internet access, and battery recharging without cables. The present study introduces this threefold role of VLC systems by properly adapting some energy harvesting receiver architectures recently launched for usage in RF communications...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429597/is-capsule-colonoscopy-the-solution-for-incomplete-conventional-colonoscopy
#5
Miguel Mascarenhas-Saraiva
The era of colon capsule endoscopy (CCE) started in 2007. Few years later second-generation CCE (CCE-2) (Medtronic, Minneapolis, USA) was launched, featuring an improved optical system allowing for nearly 360° coverage via two 172° angle cameras, and adaptive frame rate function (ranging from 4 to 35 images per second depending on capsule motion). At present the main clinical indications for CCE are: a) completion of incomplete colonoscopy; b) polyp detection; and c) investigation of inflammatory bowel disease (IBD)...
April 21, 2017: Revista Española de Enfermedades Digestivas
https://www.readbyqxmd.com/read/28427411/tendon-motion-tracking-in-an-ultrasound-image-sequence-using-optical-flow-based-block-matching
#6
Bo-I Chuang, Jian-Han Hsu, Li-Chieh Kuo, I-Ming Jou, Fong-Chin Su, Yung-Nien Sun
BACKGROUND: Tendon motion, which is commonly observed using ultrasound imaging, is one of the most important features used in tendinopathy diagnosis. However, speckle noise and out-of-plane issues make the tracking process difficult. Manual tracking is usually time consuming and often yields inconsistent results between users. METHODS: To automatically track tendon motion in ultrasound images, we developed a new method that combines the advantages of optical flow and multi-kernel block matching...
April 20, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28423909/ripping-rna-by-force-using-gaussian-network-models
#7
Changbong Hyeon, D Thirumalai
Using force as a probe to map the folding landscapes of RNA molecules has become a reality thanks to major advances in single molecule pulling experiments. Although the unfolding pathways under tension are complicated to predict, studies in the context of proteins have shown that topology is the major determinant of the unfolding landscapes. By building on this finding we study the responses of RNA molecules to force by adapting Gaussian network model (GNM) that represents RNAs using a bead-spring network with isotropic interactions...
April 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28420215/a-phonocardiographic-based-fiber-optic-sensor-and-adaptive-filtering-system-for-noninvasive-continuous-fetal-heart-rate-monitoring
#8
Radek Martinek, Jan Nedoma, Marcel Fajkus, Radana Kahankova, Jaromir Konecny, Petr Janku, Stanislav Kepak, Petr Bilik, Homer Nazeran
This paper focuses on the design, realization, and verification of a novel phonocardiographic- based fiber-optic sensor and adaptive signal processing system for noninvasive continuous fetal heart rate (fHR) monitoring. Our proposed system utilizes two Mach-Zehnder interferometeric sensors. Based on the analysis of real measurement data, we developed a simplified dynamic model for the generation and distribution of heart sounds throughout the human body. Building on this signal model, we then designed, implemented, and verified our adaptive signal processing system by implementing two stochastic gradient-based algorithms: the Least Mean Square Algorithm (LMS), and the Normalized Least Mean Square (NLMS) Algorithm...
April 18, 2017: Sensors
https://www.readbyqxmd.com/read/28419403/adaptive-optics-of-small-choroidal-melanoma
#9
Murilo W Rodrigues, Emil A Say, Carol L Shields, Rodrigo Jorge
The authors report the use of an adaptive optics (AO) system in an asymptomatic patient with small choroidal melanoma. A noninvasive, novel assessment that detected potential photoreceptor abnormalities in the retina overlying the choroidal lesion and adjacent retina is presented. These findings may help current clinical evaluation to monitor structural damage to the outer retina and possibly justify earlier intervention in borderline cases. Future research is warranted to recognize full potential of this imaging modality...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28414799/comprehensive-evaluation-of-ten-deformable-image-registration-algorithms-for-contour-propagation-between-ct-and-cone-beam-ct-images-in-adaptive-head-neck-radiotherapy
#10
Xin Li, Yuyu Zhang, Yinghua Shi, Shuyu Wu, Yang Xiao, Xuejun Gu, Xin Zhen, Linghong Zhou
Deformable image registration (DIR) is a critical technic in adaptive radiotherapy (ART) for propagating contours between planning computerized tomography (CT) images and treatment CT/cone-beam CT (CBCT) images to account for organ deformation for treatment re-planning. To validate the ability and accuracy of DIR algorithms in organ at risk (OAR) contour mapping, ten intensity-based DIR strategies, which were classified into four categories-optical flow-based, demons-based, level-set-based and spline-based-were tested on planning CT and fractional CBCT images acquired from twenty-one head & neck (H&N) cancer patients who underwent 6~7-week intensity-modulated radiation therapy (IMRT)...
2017: PloS One
https://www.readbyqxmd.com/read/28414372/graphene-based-near-field-optical-microscopy-high-resolution-imaging-using-reconfigurable-gratings
#11
Sandeep Inampudi, Jierong Cheng, Hossein Mosallaei
High-resolution and fast-paced optical microscopy is a requirement for current trends in biotechnology and materials industry. The most reliable and adaptable technique so far to obtain higher resolution than conventional microscopy is near-field scanning optical microscopy (NSOM), which suffers from a slow-paced nature. Stemming from the principles of diffraction imaging, we present fast-paced graphene-based scanning-free wide-field optical microscopy that provides image resolution that competes with NSOM...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414334/interband-cascade-laser-based-optical-transfer-standard-for-atmospheric-carbon-monoxide-measurements
#12
Javis A Nwaboh, Zhechao Qu, Olav Werhahn, Volker Ebert
We report on an interband cascade laser (ICL)-absorption spectrometer for absolute, calibration-free, atmospheric CO amount fraction measurements, addressing direct traceability of the results. The system combines first-principles direct tunable diode laser absorption spectroscopy (dTDLAS) with a metrological validation. Using a multipath cell with 76 m path length, our detection limit is 0.5 nmol/mol at Δt=14  s. The system is highly linear (slope: 0.999±0.008) in the amount fraction range of 0.1-1000 μmol/mol and thus is interesting for industrial as well as environmental applications...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28413812/quantitative-3d-time-lapse-imaging-of-muscle-progenitors-in-skeletal-muscle-of-live-mice
#13
Micah T Webster, Tyler Harvey, Chen-Ming Fan
For non-optically clear mammalian tissues, it is now possible to use multi-photon microscopy to penetrate deep into the tissue and obtain detailed single cell images in a live animal, i.e., intravital imaging. This technique is in principle applicable to any fluorescently marked cell, and we have employed it to observe stem cells during the regenerative process. Stem cell-mediated skeletal muscle regeneration in the mouse model has been classically studied at specific time points by sacrificing the animal and harvesting the muscle tissue for downstream analyses...
December 20, 2016: Bio-protocol
https://www.readbyqxmd.com/read/28411336/fdg-pet-for-therapy-monitoring-in-hodgkin-and-non-hodgkin-lymphomas
#14
REVIEW
Sally F Barrington, Regine Kluge
PET using (18)F-FDG for treatment monitoring in patients with lymphoma is one of the most well-developed clinical applications. PET/CT is nowadays used during treatment to assess chemosensitivity, with response-adapted therapy given according to 'interim' PET in clinical practice to adults and children with Hodgkin lymphoma. PET is also used to assess remission from disease and to predict prognosis in the pretransplant setting. Mature data have been reported for the common subtypes of aggressive B-cell lymphomas, with more recent data also supporting the use of PET for response assessment in T-cell lymphomas...
April 14, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28396824/evolutionary-analysis-of-vision-genes-identifies-potential-drivers-of-visual-differences-between-giraffe-and-okapi
#15
Edson Ishengoma, Morris Agaba, Douglas R Cavener
BACKGROUND: The capacity of visually oriented species to perceive and respond to visual signal is integral to their evolutionary success. Giraffes are closely related to okapi, but the two species have broad range of phenotypic differences including their visual capacities. Vision studies rank giraffe's visual acuity higher than all other artiodactyls despite sharing similar vision ecological determinants with many of them. The extent to which the giraffe's unique visual capacity and its difference with okapi is reflected by changes in their vision genes is not understood...
2017: PeerJ
https://www.readbyqxmd.com/read/28392976/an-automated-reference-frame-selection-arfs-algorithm-for-cone-imaging-with-adaptive-optics-scanning-light-ophthalmoscopy
#16
Alexander E Salmon, Robert F Cooper, Christopher S Langlo, Ahmadreza Baghaie, Alfredo Dubra, Joseph Carroll
PURPOSE: To develop an automated reference frame selection (ARFS) algorithm to replace the subjective approach of manually selecting reference frames for processing adaptive optics scanning light ophthalmoscope (AOSLO) videos of cone photoreceptors. METHODS: Relative distortion was measured within individual frames before conducting image-based motion tracking and sorting of frames into distinct spatial clusters. AOSLO images from nine healthy subjects were processed using ARFS and human-derived reference frames, then aligned to undistorted AO-flood images by nonlinear registration and the registration transformations were compared...
April 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28392451/electron-tomography-simulator-with-realistic-3d-phantom-for-evaluation-of-acquisition-alignment-and-reconstruction-methods
#17
Xiaohua Wan, Tsvi Katchalski, Christopher Churas, Sreya Ghosh, Sebastien Phan, Albert Lawrence, Yu Hao, Ziying Zhou, Ruijuan Chen, Yu Chen, Fa Zhang, Mark H Ellisman
Because of the significance of electron microscope tomography in the investigation of biological structure at nanometer scales, ongoing improvement efforts have been continuous over recent years. This is particularly true in the case of software developments. Nevertheless,verification of improvements delivered by new algorithms and software remains difficult. Current analysis tools do not provide adaptable and consistent methods for quality assessment.This is particularly true with images of biological samples, due to image complexity, variability, low contrast and noise...
April 6, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28388086/immersion-meta-lenses-at-visible-wavelengths-for-nanoscale-imaging
#18
Wei Ting Chen, Alexander Yutong Zhu, Mohammadreza Khorasaninejad, Zhujun Shi, Vyshakh Sanjeev, Federico Capasso
Immersion objectives can focus light into a spot smaller than what is achievable in free space, thereby enhancing the spatial resolution for various applications such as microscopy, spectroscopy, and lithography. Despite the availability of advanced lens polishing techniques, hand-polishing is still required to manufacture the front lens of an immersion objective, which poses major constraints for lens design. This limits the shape of the front lens to spherical. Therefore, several other lenses need to be cascaded to correct for spherical aberration, resulting in significant challenges for miniaturization and adding design complexity for different immersion liquids...
April 7, 2017: Nano Letters
https://www.readbyqxmd.com/read/28386575/comparing-diffuse-optical-tomography-and-functional-magnetic-resonance-imaging-signals-during-a-cognitive-task-pilot-study
#19
Estefania Hernández-Martin, Francisco Marcano, Oscar Casanova, Cristian Modroño, Julio Plata-Bello, Jose Luis González-Mora
Diffuse optical tomography (DOT) measures concentration changes in both oxy- and deoxyhemoglobin providing three-dimensional images of local brain activations. A pilot study, which compares both DOT and functional magnetic resonance imaging (fMRI) volumes through t-maps given by canonical statistical parametric mapping (SPM) processing for both data modalities, is presented. The DOT series were processed using a method that is based on a Bayesian filter application on raw DOT data to remove physiological changes and minimum description length application index to select a number of singular values, which reduce the data dimensionality during image reconstruction and adaptation of DOT volume series to normalized standard space...
January 2017: Neurophotonics
https://www.readbyqxmd.com/read/28386392/roadmap-on-neurophotonics
#20
Yong Ku Cho, Guoan Zheng, George J Augustine, Daniel Hochbaum, Adam Cohen, Thomas Knöpfel, Ferruccio Pisanello, Francesco S Pavone, Ivo M Vellekoop, Martin J Booth, Song Hu, Jiang Zhu, Zhongping Chen, Yoko Hoshi
Mechanistic understanding of how the brain gives rise to complex behavioral and cognitive functions is one of science's grand challenges. The technical challenges that we face as we attempt to gain a systems-level understanding of the brain are manifold. The brain's structural complexity requires us to push the limit of imaging resolution and depth, while being able to cover large areas, resulting in enormous data acquisition and processing needs. Furthermore, it is necessary to detect functional activities and 'map' them onto the structural features...
September 2016: Journal of Optics
keyword
keyword
66932
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"