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Ryan P Goff, Stephen G Quallich, Robert A Buechler, John C Bischof, Paul A Iaizzo
Despite widespread clinical use of cryoablation, there remain questions regarding dosing and treatment times which may affect efficacy and collateral injury. Dosing and treatment times are directly related to the degree of cooling necessary for effective lesion formation. Human and swine atrial, ventricular, and lung tissues were ablated using two cryoablation systems with concurrent infrared thermography. Post freeze-thaw samples were cultured and stained to differentiate viable and non-viable tissue. Matlab code correlated viability staining to applied freeze-thaw thermal cycles, to determine injury thresholds...
January 3, 2017: Cryobiology
Kamiar Ghoseiri, Yong Ping Zheng, Aaron K L Leung, Mehdi Rahgozar, Gholamreza Aminian, Mehdi Masoumi, Mohammad Reza Safari
The snug fit of a prosthetic socket over the residual limb can disturb thermal balance and put skin integrity in jeopardy by providing an unpleasant and infectious environment. The prototype of a temperature measurement and control (TM&C) system was previously introduced to resolve thermal problems related to prostheses. This study evaluates its clinical application in a setting with reversal, single subject design. The TM&C system was installed on fabricated prosthetic socket of a man with unilateral transtibial amputation...
January 5, 2017: Assistive Technology: the Official Journal of RESNA
Dominique Alexandre, Marc Prieto, Fabien Beaumont, Redha Taiar, Guillaume Polidori
BACKGROUND: The purpose of this study is to quantify the impact of the weight of radiation protection lead aprons on the discomfort and the fatigue of the medical staff within an operating room of interventional gastroenterology. To quantify this fatigue, we analyzed variations of the physiological parameters, including heart rate, blood pressure, and cutaneous temperature; we compared two situations: the first within the classic endoscopy department (without apron) and the second within the operating room with apron...
November 2, 2016: Journal of Surgical Research
R W Queiroz, V L Silva, D R Rocha, D S Costa, S H N Turco, M T B Silva, A A Santos, M B L Oliveira, A S R Pereira, R C Palheta-Junior
Changes in physiological parameters that are induced by acute exercise on a treadmill in healthy military dogs have not been thoroughly investigated, especially with regard to age. This study investigated the effects of acute exercise on a treadmill on cardiovascular function, biochemical parameters and gastric antral motility in military dogs. Thermography was used to assess variations in superficial hindlimb muscle temperature. Nine healthy dogs were distributed into three groups according to their age (Group I: 25 ± 7 months; Group II: 51 ± 12 months; Group III: 95 ± 10 months) and sequentially subjected to running exercise on a treadmill for 12 min (3...
December 29, 2016: Journal of Animal Physiology and Animal Nutrition
Cynthia L Thompson, Caleb Scheidel, Kenneth E Glander, Susan H Williams, Christopher J Vinyard
Infrared thermography has become a useful tool to assess surface temperatures of animals for thermoregulatory research. However, surface temperatures are an endpoint along the body's core-shell temperature gradient. Skin and fur are the peripheral tissues most exposed to ambient thermal conditions and are known to serve as thermosensors that initiate thermoregulatory responses. Yet relatively little is known about how surface temperatures of wild mammals measured by infrared thermography relate to subcutaneous temperatures...
January 2017: Journal of Thermal Biology
Jesper K Holm, John G Kellett, Nadia H Jensen, Søren N Hansen, Kristian Jensen, Mikkel Brabrand
OBJECTIVE: In this study, we aimed to investigate the prognostic potential of infrared thermography in a population of medical patients admitted to the emergency department. Central-to-peripheral temperature gradients were analyzed for association with 30-day mortality. METHODS: This prospective observational study included 198 medical patients admitted to the Emergency Department, at Odense University Hospital. A standardized thermal picture was taken and temperatures of the inner canthus, the earlobe, the nose tip, and the tip of the third finger were reported...
December 20, 2016: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
David M Deery, Greg J Rebetzke, Jose A Jimenez-Berni, Richard A James, Anthony G Condon, William D Bovill, Paul Hutchinson, Jamie Scarrow, Robert Davy, Robert T Furbank
Lower canopy temperature (CT), resulting from increased stomatal conductance, has been associated with increased yield in wheat. Historically, CT has been measured with hand-held infrared thermometers. Using the hand-held CT method on large field trials is problematic, mostly because measurements are confounded by temporal weather changes during the time required to measure all plots. The hand-held CT method is laborious and yet the resulting heritability low, thereby reducing confidence in selection in large scale breeding endeavors...
2016: Frontiers in Plant Science
Xiang Liu, Lu Huang, Dan Guo, Guoxin Xie
To simulate the heat and mass transfer in real heterogeneous systems, such as metal-production processes and lubrication, the point-contact condition with the formation of narrowly confined liquid film and its surrounding meniscus was constructed to study the classical microchannel boiling problem in this work. Specifically, the evaporation and diffusion of the superheated water meniscus and water/oil droplet in the point-contact geometry were investigated. The emphasis is put on the influence of the contact-line transport behaviors on nucleation and bubble dynamics in the confined meniscus...
December 29, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
María L Pérez-Bueno, Mónica Pineda, Francisco M Cabeza, Matilde Barón
The negative impact of conventional farming on environment and human health make improvements on farming management mandatory. Imaging techniques are implemented in remote sensing for monitoring crop fields and plant phenotyping programs. The increasingly large size and complexity of the data obtained by these techniques, makes the implementation of powerful mathematical tools necessary in order to identify informative parameters and to apply them in precision agriculture. Multicolor fluorescence imaging is a useful approach for the study of plant defense responses to stress factors at bench scale...
2016: Frontiers in Plant Science
D Jay McCracken, Jon T Willie, Brad Fernald, Amit M Saindane, Daniel L Drane, Daniel L Barrow, Robert E Gross
BACKGROUND: Surgery is indicated for cerebral cavernous malformations (CCM) that cause medically refractory epilepsy. Real-time magnetic resonance thermography (MRT)-guided stereotactic laser ablation (SLA) is a minimally invasive approach to treating focal brain lesions. SLA of CCM has not previously been described. OBJECTIVE: To describe MRT-guided SLA, a novel approach to treating CCM-related epilepsy, with respect to feasibility, safety, imaging, and seizure control in 5 consecutive patients...
March 2016: Operative Neurosurgery (Hagerstown, Md.)
Jing Xie, Sheng-Jen Hsieh, Hong-Jin Wang, Zuojun Tan
The United States and China are the world's leading tomato producers. Tomatoes account for over $2 billion annually in farm sales in the U.S. Tomatoes also rank as the world's 8th most valuable agricultural product, valued at $58 billion dollars annually, and quality is highly prized. Nondestructive technologies, such as optical inspection and near-infrared spectrum analysis, have been developed to estimate tomato freshness (also known as grades in USDA parlance). However, determining the freshness of tomatoes is still an open problem...
December 1, 2016: Applied Optics
Nicola Ludwig, Athos Trecroci, Marco Gargano, Damiano Formenti, Andrea Bosio, Ermanno Rampinini, Giampietro Alberti
The use of thermal imaging in monitoring the dynamic of skin temperature during prolonged physical exercise is central to assess athletes' ability to dissipate heat from the skin surface to the environment. In this study, seven elite cyclists completed an incremental maximal cycling test to evaluate their skin temperature response under controlled-environment conditions. Thermal images have been analyzed using a method based on maxima detection (T<sub>max</sub>). Data confirmed a reduction in skin temperature due to vasoconstriction during the exercise, followed by a temperature increment after exhaustion...
December 1, 2016: Applied Optics
Christiane Maierhofer, Mathias Röllig, Rainer Krankenhagen, Philipp Myrach
Using optical excitation sources for active thermography enables a contactless, remote, and non-destructive testing of materials and structures. Currently, two kinds of temporal excitation techniques have been established: pulse or flash excitation, using mostly flash lamps; and periodic or lock-in excitation, using halogen lamps, LED, or laser arrays. From the experimental point of view, both techniques have their advantages and disadvantages. Concerning the comparison of the testing results of both techniques, only very few studies have been performed in the past...
December 1, 2016: Applied Optics
Maryam Asrar, Amin Al-Habaibeh, Mohammed Houda
Intravenous cannulation is the process of inserting a cannula into a vein to administrate medication, fluids, or to take blood samples. The process of identification and of locating veins plays an important role during the intravenous cannulation procedure to reduce health care costs and the suffering of patients. This paper compares the three technologies used to assess their suitability and capability for the detection of veins to support the cannulation process. Three types of cameras are used in this study; a visual, an infrared, and a near infrared...
December 1, 2016: Applied Optics
J Skala, M Svantner, J Tesar, A Franc
Industrial lasers are an expanding technology of welding and other materials processing. Lasers with optical scanning heads are often used, as these provide more versatility, accuracy, and speed. The output part of the scanning head is covered by a protective glass, which might get contaminated by various particles from the laser processing. This decreases the transmissivity of the glass, and it can affect the production quality. The contamination needs to be checked regularly, but a visual inspection might not always be effective...
December 1, 2016: Applied Optics
Henrique Fernandes, Hai Zhang, Alisson Figueiredo, Clemente Ibarra-Castanedo, Gilmar Guimarares, Xavier Maldague
Composite materials are widely used in the aeronautic industry. One of the reasons is because they have strength and stiffness comparable to metals, with the added advantage of significant weight reduction. Infrared thermography (IT) is a safe nondestructive testing technique that has a fast inspection rate. In active IT, an external heat source is used to stimulate the material being inspected in order to generate a thermal contrast between the feature of interest and the background. In this paper, carbon-fiber-reinforced polymers are inspected using IT...
December 1, 2016: Applied Optics
W Swiderski
Eddy current infrared (IR) thermography is a new nondestructive testing (NDT) technique used for the detection of cracks in electroconductive materials. By combining the well-established inspection methods of eddy current NDT and IR thermography, this technique uses induced eddy currents to heat test samples. In this way, IR thermography allows the visualization of eddy current distribution that is distorted in defect sites. This paper discusses the results of numerical modeling of eddy current IR thermography procedures in application to marine structures...
December 1, 2016: Applied Optics
Hai Zhang, Henrique Fernandes, Frank Billy Djupkep Dizeu, Ulf Hassler, Julien Fleuret, Marc Genest, Clemente Ibarra-Castanedo, François Robitaille, Simon Joncas, Xavier Maldague
In this article, pulsed micro-laser line thermography (pulsed micro-LLT) was used to detect the submillimeter porosities in a 3D preformed carbon fiber reinforced polymer composite specimen. X-ray microcomputed tomography was used to verify the thermographic results. Then, finite element analysis was performed on the corresponding models on the basis of the experimental results. The same infrared image processing techniques were used for the experimental and simulation results for comparative purposes. Finally, a comparison of experimental and simulation postprocessing results was conducted...
December 1, 2016: Applied Optics
Boris G Vainer
In a brief review, the beneficial outcomes that have arisen from simultaneous use of laser- and infrared thermography (IRT)-based techniques are demonstrated. The most recent literary and original experimental results collected from different research and practical areas are presented. It is shown that modern IRT acts as an indispensable laser partner in various biomedical and many other applications and technologies. And vice versa, the laser-based methods and techniques often serve as an appropriate research instrument enriching IRT measurement data with independently obtained information...
December 1, 2016: Applied Optics
Maria T Garcia-Romero, Harkamal K Randhawa, Ronald Laxer, Elena Pope
BACKGROUND: Determining the activity of localized scleroderma (LS) remains crucial for decision making, and reliable clinical indicators of activity are lacking. Our objective in this study was to analyze the utility of infrared thermography (IRT) in assessing the activity of LS according to existing clinical scales. A secondary objective was to study whether clinical characteristics of patients and/or IRT have any role in predicting the activity of LS. METHODS: In this cross-sectional study, the activity of LS was determined using a visual analog scale (VAS), a dyspigmentation-induration-erythema-telangiectasias (DIET) scale, and a localized scleroderma skin severity index (LoSSI)...
January 2017: International Journal of Dermatology
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