keyword
MENU ▼
Read by QxMD icon Read
search

cameras

keyword
https://www.readbyqxmd.com/read/28719742/integrated-smartphone-app-chip-system-for-on-site-ppb-level-colorimetric-quantitation-of-aflatoxins
#1
Xiaochun Li, Fan Yang, Jessica X H Wong, Hua-Zhong Yu
We demonstrate herein an integrated, smartphone-app-chip (SPAC) system for on-site quantitation of food toxins, as demonstrated with aflatoxin B1 (AFB1), at parts-per-billion (ppb) level in food products. The detection is based on an indirect competitive immunoassay fabricated on a transparent plastic chip with the assistance of a microfluidic channel plate. A 3D-printed optical accessory attached to a smartphone is adapted to align the assay chip and to provide uniform illumination for imaging, with which high-quality images of the assay chip are captured by the smartphone camera and directly processed using a custom-developed Android app...
July 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28719707/community-triage-of-otology-patients-using-a-store-and-forward-telemedicine-device-a-feasibility-study
#2
Nishi Gupta, Neeraj Chawla, Digant Gupta, Nidhi Dhawan, Vidya R Janaki
Chronic otitis media is a major contributor to acquired hearing loss in developing countries. Developing countries such as India, with huge populations and poor health infrastructures, have always felt the shortage of trained specialists who can provide quality care to meet the enormous demand for treatment of this disease. This pilot study assessed the feasibility of empowering trained health workers equipped with ENTraview, a store-and-forward telemedicine device that integrates a camera- enabled smart phone with an otoscope...
July 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28719603/the-%C3%A2-100-lab-a-3d-printable-open-source-platform-for-fluorescence-microscopy-optogenetics-and-accurate-temperature-control-during-behaviour-of-zebrafish-drosophila-and-caenorhabditis-elegans
#3
Andre Maia Chagas, Lucia L Prieto-Godino, Aristides B Arrenberg, Tom Baden
Small, genetically tractable species such as larval zebrafish, Drosophila, or Caenorhabditis elegans have become key model organisms in modern neuroscience. In addition to their low maintenance costs and easy sharing of strains across labs, one key appeal is the possibility to monitor single or groups of animals in a behavioural arena while controlling the activity of select neurons using optogenetic or thermogenetic tools. However, the purchase of a commercial solution for these types of experiments, including an appropriate camera system as well as a controlled behavioural arena, can be costly...
July 2017: PLoS Biology
https://www.readbyqxmd.com/read/28719007/validating-activity-indices-from-camera-traps-for-commensal-rodents-and-other-wildlife-in-and-around-farm-buildings
#4
Mark Lambert, Fiona Bellamy, Richard Budgey, Rebecca Callaby, Julia Coats, Janet Talling
BACKGROUND: Indices of rodent activity are used as indicators of population change during field evaluation of rodenticides. We investigated the potential for using camera traps to determine activity indices for commensal rodents living in and around farm buildings, and sought to compare these indices against previously calibrated survey methods. RESULTS: We recorded 41, 263 images of 23 species including Norway rats (Rattus norvegicus Berk.) and house mice (Mus musculus L...
July 18, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28718790/preliminary-study-of-uas-equipped-with-thermal-camera-for-volcanic-geothermal-monitoring-in-taiwan
#5
Shih-Hong Chio, Cheng-Horng Lin
Thermal infrared cameras sense the temperature information of sensed scenes. With the development of UASs (Unmanned Aircraft Systems), thermal infrared cameras can now be carried on a quadcopter UAV (Unmanned Aircraft Vehicle) to appropriately collect high-resolution thermal images for volcanic geothermal monitoring in a local area. Therefore, the quadcopter UAS used to acquire thermal images for volcanic geothermal monitoring has been developed in Taiwan as part of this study to overcome the difficult terrain with highly variable topography and extreme environmental conditions...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718788/implementation-of-an-imu-aided-image-stacking-algorithm-in-a-digital-camera-for-unmanned-aerial-vehicles
#6
Ahmad Audi, Marc Pierrot-Deseilligny, Christophe Meynard, Christian Thom
Images acquired with a long exposure time using a camera embedded on UAVs (Unmanned Aerial Vehicles) exhibit motion blur due to the erratic movements of the UAV. The aim of the present work is to be able to acquire several images with a short exposure time and use an image processing algorithm to produce a stacked image with an equivalent long exposure time. Our method is based on the feature point image registration technique. The algorithm is implemented on the light-weight IGN (Institut national de l'information géographique) camera, which has an IMU (Inertial Measurement Unit) sensor and an SoC (System on Chip)/FPGA (Field-Programmable Gate Array)...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718772/performance-evaluation-of-macaco-a-multilayer-compton-camera
#7
Enrique Muñoz, John Barrio, Ane Etxebeste, Pablo Garcia Ortega, Carlos Lacasta, Josep Francisco Oliver, Carles Solaz, Gabriela Llosa
Compton imaging devices have been proposed and studied for a wide range of applications. We have developed a Compton camera prototype which can be operated with two or three detector layers based on monolithic lanthanum bromide (LaBr3) crystals coupled to silicon photomultipliers (SiPMs), to be used for proton range verification in hadron therapy. In this work, we present the results obtained with our prototype in laboratory tests with radioactive sources and in simulation studies...
July 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28718523/error-rate-of-automated-calculation-for-wound-surface-area-using-a-digital-photography
#8
S Yang, J Park, H Lee, J B Lee, B U Lee, B H Oh
BACKGROUND: Although measuring would size using digital photography is a quick and simple method to evaluate the skin wound, the possible compatibility of it has not been fully validated. PURPOSE: To investigate the error rate of our newly developed wound surface area calculation using digital photography. METHODS: Using a smartphone and a digital single lens reflex (DSLR) camera, four photographs of various sized wounds (diameter: 0.5-3.5 cm) were taken from the facial skin model in company with color patches...
July 17, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/28718293/functional-design-of-dielectric-metal-dielectric-based-thin-film-encapsulation-with-heat-transfer-and-flexibility-for-flexible-displays
#9
Jeong Hyun Kwon, Seungyeop Choi, Yongmin Jeon, Hyuncheol Kim, Ki Soo Chang, Kyung Cheol Choi
In this study, a new and efficient dielectric-metal-dielectric-based thin-film encapsulation (DMD-TFE) with an inserted Ag thin film is proposed to guarantee the reliability of flexible displays by improving the barrier properties, mechanical flexibility, and heat dissipation, considered as essential requirements for OLED encapsulation. The DMD-TFE, which is composed of Al2O3, Ag, and a silica nanoparticle-embedded sol-gel hybrid nanocomposite, shows a water vapor transmission rate of 8.70 × 10-6 g/m2/day and good mechanical reliability at a bending radius of 30 mm corresponding to 0...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718089/eye-blink-detection-for-different-driver-states-in-conditionally-automated-driving-and-manual-driving-using-eog-and-a-driver-camera
#10
Jürgen Schmidt, Rihab Laarousi, Wolfgang Stolzmann, Katja Karrer-Gauß
In this article, we examine the performance of different eye blink detection algorithms under various constraints. The goal of the present study was to evaluate the performance of an electrooculogram- and camera-based blink detection process in both manually and conditionally automated driving phases. A further comparison between alert and drowsy drivers was performed in order to evaluate the impact of drowsiness on the performance of blink detection algorithms in both driving modes. Data snippets from 14 monotonous manually driven sessions (mean 2 h 46 min) and 16 monotonous conditionally automated driven sessions (mean 2 h 45 min) were used...
July 17, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28718074/advances-in-imaging-instrumentation-for-nuclear-cardiology
#11
Jae Sung Lee, Gil Kovalski, Tali Sharir, Dong Soo Lee
Advances in imaging instrumentation and technology have greatly contributed to nuclear cardiology. Dedicated cardiac SPECT cameras incorporating novel, highly efficient detector, collimator, and system designs have emerged with the expansion of nuclear cardiology. Solid-state radiation detectors incorporating cadmium zinc telluride, which directly convert radiation to electrical signals and yield improved energy resolution and spatial resolution and enhanced count sensitivity geometries, are increasingly gaining favor as the detector of choice for application in dedicated cardiac SPECT systems...
July 17, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28717721/evaluation-of-a-smartphone-based-training-strategy-among-health-care-workers-screening-for-cervical-cancer-in-northern-tanzania-the-kilimanjaro-method
#12
Karen E Yeates, Jessica Sleeth, Wilma Hopman, Ophira Ginsburg, Katharine Heus, Linda Andrews, Mary Rose Giattas, Safina Yuma, Godwin Macheku, Aziz Msuya, Olola Oneko
PURPOSE: Almost nine of 10 deaths resulting from cervical cancer occur in low-income countries. Visual inspection under acetic acid (VIA) is an evidence-based, cost-effective approach to cervical cancer screening (CCS), but challenges to effective implementation include health provider training costs, provider turnover, and skills retention. We hypothesized that a smartphone camera and use of cervical image transfer for real-time mentorship by experts located distantly across a closed user group through a commercially available smartphone application would be both feasible and effective in enhancing VIA skills among CCS providers in Tanzania...
December 2016: Journal of Global Oncology
https://www.readbyqxmd.com/read/28717569/histogram-analysis-for-smartphone-based-rapid-hematocrit-determination
#13
Uddin M Jalal, Sang C Kim, Joon S Shim
A novel and rapid analysis technique using histogram has been proposed for the colorimetric quantification of blood hematocrits. A smartphone-based "Histogram" app for the detection of hematocrits has been developed integrating the smartphone embedded camera with a microfluidic chip via a custom-made optical platform. The developed histogram analysis shows its effectiveness in the automatic detection of sample channel including auto-calibration and can analyze the single-channel as well as multi-channel images...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28717564/electrically-tunable-fluidic-lens-imaging-system-for-laparoscopic-fluorescence-guided-surgery
#14
Davide Volpi, Iain D C Tullis, Paul R Barber, Edyta M Augustyniak, Sean C Smart, Katherine A Vallis, Borivoj Vojnovic
The addition of fluorescence guidance in laparoscopic procedures has gained significant interest in recent years, particularly through the use of near infrared (NIR) markers. In this work we present a novel laparoscope camera coupler based on an electrically tunable fluidic lens that permits programmable focus control and has desirable achromatic performance from the visible to the NIR. Its use extends the lower working distance limit and improves detection sensitivity, important for work with molecularly targeted fluorescence markers...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28716535/variable-compensation-during-the-sit-to-stand-task-among-individuals-with-severe-knee-osteoarthritis
#15
Yoshimasa Sagawa, Alice Bonnefoy-Mazure, Stéphane Armand, Anne Lubbeke, Pierre Hoffmeyer, Domizio Suva, Katia Turcot
BACKGROUND: Individuals with knee osteoarthritis (OA) show variability during the sit-to-stand (STS) task, so they may not perform the STS in the same way. This study aimed to determine whether individuals with knee OA have different strategies in performing the STS. METHODS: Participants with knee OA and able-bodied individuals underwent STS evaluation at a self-selected pace with use of a motion measurement system consisting of 12 cameras and 2 force plates. RESULTS: In total, 101 participants (57 women) with knee OA showed 3 main STS strategies...
July 14, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28715442/combining-random-forest-with-multi-block-local-binary-pattern-feature-selection-for-multiclass-head-pose-estimation
#16
Min-Joo Kang, Jung-Kyung Lee, Je-Won Kang
A new head pose estimation technique based on Random Forest (RF) and texture features for facial image analysis using a monocular camera is proposed in this paper, especially about how to efficiently combine the random forest and the features. In the proposed technique a randomized tree with useful attributes is trained to improve estimation accuracy and tolerance of occlusions and illumination. Specifically, a number of features including Multi-scale Block Local Block Pattern (MB-LBP) are extracted from an image, and random features such as the MB-LBP scale parameters, a block coordinate, and a layer of an image pyramid in the feature pool are used for training the tree...
2017: PloS One
https://www.readbyqxmd.com/read/28715396/smartphone-fundus-photography
#17
Hossein Nazari Khanamiri, Austin Nakatsuka, Jaafar El-Annan
Smartphone fundus photography is a simple technique to obtain ocular fundus pictures using a smartphone camera and a conventional handheld indirect ophthalmoscopy lens. This technique is indispensable when picture documentation of optic nerve, retina, and retinal vessels is necessary but a fundus camera is not available. The main advantage of this technique is the widespread availability of smartphones that allows documentation of macula and optic nerve changes in many settings that was not previously possible...
July 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715372/high-resolution-episcopic-microscopy-hrem-simple-and-robust-protocols-for-processing-and-visualizing-organic-materials
#18
Stefan H Geyer, Barbara Maurer-Gesek, Lukas F Reissig, Wolfgang J Weninger
We provide simple protocols for generating digital volume data with the high-resolution episcopic microscopy (HREM) method. HREM is capable of imaging organic materials with volumes up to 5 x 5 x 7 mm(3) in typical numeric resolutions between 1 x 1 x 1 and 5 x 5 x 5 µm(3). Specimens are embedded in methacrylate resin and sectioned on a microtome. After each section an image of the block surface is captured with a digital video camera that sits on the phototube connected to the compound microscope head. The optical axis passes through a green fluorescent protein (GFP) filter cube and is aligned with a position, at which the bock holder arm comes to rest after each section...
July 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715368/loading-a-calcium-dye-into-frog-nerve-endings-through-the-nerve-stump-calcium-transient-registration-in-the-frog-neuromuscular-junction
#19
Dmitry V Samigullin, Eduard F Khaziev, Nikita V Zhilyakov, Ellya A Bukharaeva, Eugeny E Nikolsky
One of the most feasible methods of measuring presynaptic calcium levels in presynaptic nerve terminals is optical recording. It is based on using calcium-sensitive fluorescent dyes that change their emission intensity or wavelength depending on the concentration of free calcium in the cell. There are several methods used to stain cells with calcium dyes. Most common are the processes of loading the dyes through a micropipette or pre-incubating with the acetoxymethyl ester forms of the dyes. However, these methods are not quite applicable to neuromuscular junctions (NMJs) due to methodological issues that arise...
July 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715367/microfluidic-imaging-flow-cytometry-by-asymmetric-detection-time-stretch-optical-microscopy-atom
#20
Anson H L Tang, Queenie T K Lai, Bob M F Chung, Kelvin C M Lee, Aaron T Y Mok, G K Yip, Anderson H C Shum, Kenneth K Y Wong, Kevin K Tsia
Scaling the number of measurable parameters, which allows for multidimensional data analysis and thus higher-confidence statistical results, has been the main trend in the advanced development of flow cytometry. Notably, adding high-resolution imaging capabilities allows for the complex morphological analysis of cellular/sub-cellular structures. This is not possible with standard flow cytometers. However, it is valuable for advancing our knowledge of cellular functions and can benefit life science research, clinical diagnostics, and environmental monitoring...
June 28, 2017: Journal of Visualized Experiments: JoVE
keyword
keyword
63329
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"