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https://www.readbyqxmd.com/read/28332995/three-dimensional-dosimetric-validation-of-a-magnetic-resonance-guided-intensity-modulated-radiation-therapy-system
#1
Leith J Rankine, Stewart Mein, Bin Cai, Austen Curcuru, Titania Juang, Devin Miles, Sasa Mutic, Yuhe Wang, Mark Oldham, H Harold Li
PURPOSE: To validate the dosimetric accuracy of a commercially available magnetic resonance guided intensity modulated radiation therapy (MRgIMRT) system using a hybrid approach: 3-dimensional (3D) measurements and Monte Carlo calculations. METHODS AND MATERIALS: We used PRESAGE radiochromic plastic dosimeters with remote optical computed tomography readout to perform 3D high-resolution measurements, following a novel remote dosimetry protocol. We followed the intensity modulated radiation therapy commissioning recommendations of American Association of Physicists in Medicine Task Group 119, adapted to incorporate 3D data...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28332008/case-of-adult-onset-neuronal-intranuclear-hyaline-inclusion-disease-with-negative-electroretinogram
#2
Wataru Yamada, Akira Takekoshi, Kyoko Ishida, Kiyofumi Mochizuki, Jun Sone, Gen Sobue, Yuichi Hayashi, Takashi Inuzuka, Yozo Miyake
PURPOSE: To report the findings in a 72-year-old man with neuronal intranuclear hyaline inclusion disease (NIHID) with the negative-type electroretinogram (ERG) and without night blindness. METHODS: Standard ophthalmological examinations including the medical history, measurements of the best-corrected visual acuity and intraocular pressures, slit-lamp biomicroscopy, ophthalmoscopy, spectral-domain optical coherence tomography, fundus autofluorescence, and perimetry were performed...
March 22, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28331790/ultrathin-fluidic-laminates-for-large-area-fa%C3%A3-ade-integration-and-smart-windows
#3
Benjamin P V Heiz, Zhiwen Pan, Gerhard Lautenschläger, Christin Sirtl, Matthias Kraus, Lothar Wondraczek
Buildings represent more than 40% of Europe's energy demands and about one third of its CO2 emissions. Energy efficient buildings and, in particular, building skins have therefore been among the key priorities of international research agendas. Here, glass-glass fluidic devices are presented for large-area integration with adaptive façades and smart windows. These devices enable harnessing and dedicated control of various liquids for added functionality in the building envelope. Combining a microstructured glass pane, a thin cover sheet with tailored mechanical performance, and a liquid for heat storage and transport, a flat-panel laminate is generated with thickness adapted to a single glass sheet in conventional windows...
March 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28325908/tuning-of-large-piezoelectric-response-in-nanosheet-buffered-lead-zirconate-titanate-films-on-glass-substrates
#4
Anuj Chopra, Muharrem Bayraktar, Maarten Nijland, Johan E Ten Elshof, Fred Bijkerk, Guus Rijnders
Renewed interest has been witnessed in utilizing the piezoelectric response of PbZr0.52Ti0.48O3 (PZT) films on glass substrates for applications such as adaptive optics. Accordingly, new methodologies are being explored to grow well-oriented PZT thin films to harvest a large piezoelectric response. However, thin film piezoelectric response is significantly reduced compared to intrinsic response due to substrate induced clamping, even when films are well-oriented. Here, a novel method is presented to grow preferentially (100)-oriented PZT films on glass substrates by utilizing crystalline nanosheets as seed layers...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324977/a-novel-method-to-assess-angle-sensor-performance-for-wearable-exoskeletal-joint-kinematics
#5
Nicholas B Bolus, Geza F Kogler, Omer T Inan
Full range of motion (ROM) at a joint is necessary for efficient and adaptive movement; as such, it is an essential clinical evaluation measure for assessing an individual's motor function, which can be affected by any number of musculoskeletal injuries and neuropathies. Measurement of joint ROM in the clinic has classically been accomplished statically through the use of a manual goniometer. More recent efforts in the fields of prosthetics and orthotics have demonstrated the potential utility of wearable systems (e...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324117/accommodation-responds-to-optical-vergence-and-not-defocus-blur-alone
#6
Antonio J Del Águila-Carrasco, Iván Marín-Franch, Paula Bernal-Molina, José J Esteve-Taboada, Philip B Kruger, Robert Montés-Micó, Norberto López-Gil
Purpose: To determine whether changes in wavefront spherical curvature (optical vergence) are a directional cue for accommodation. Methods: Nine subjects participated in this experiment. The accommodation response to a monochromatic target was measured continuously with a custom-made adaptive optics system while astigmatism and higher-order aberrations were corrected in real time. There were two experimental open-loop conditions: vergence-driven condition, where the deformable mirror provided sinusoidal changes in defocus at the retina between -1 and +1 diopters (D) at 0...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28320288/analysis-of-photoprotection-and-apparent-non-photochemical-quenching-of-chlorophyll-fluorescence-in-tradescantia-leaves-based-on-the-rate-of-irradiance-induced-changes-in-optical-transparence
#7
V V Ptushenko, O S Ptushenko, O P Samoilova, A E Solovchenko
The kinetics of irradiation-induced changes in leaf optical transparence (ΔT) and non-photochemical quenching (NPQ) of chlorophyll fluorescence in Tradescantia fluminensis and T. sillamontana leaves adapted to different irradiance in nature was analyzed. Characteristic times of a photoinduced increase and a dark decline of ΔT in these species were 12 and 20 min, respectively. The ΔT was not confirmed to be the main contributor to the observed middle phase of NPQ relaxation kinetics (τ = 10-28 min). Comparison of rate of photoinduced increase in ΔT and photosystem II quantum yield recovery showed that the former did not affect the tolerance of the photosynthetic apparatus (PSA) to irradiances up to 150 µmol PAR·m(-2)·s(-1)...
January 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28319641/correlation-of-visually-evoked-functional-and-blood-flow-changes-in-the-rat-retina-measured-with-a-combined-oct-erg-system
#8
Bingyao Tan, Erik Mason, Benjamin MacLellan, Kostadinka K Bizheva
Purpose: To correlate visually evoked functional and blood flow changes in the rat retina measured simultaneously with a combined optical coherence tomography and electroretinography system (OCT+ERG). Methods: Male Brown Norway (n = 6) rats were dark adapted and anesthetized with ketamine/xylazine. Visually evoked changes in the retinal blood flow (RBF) and functional response were measured simultaneously with an OCT+ERG system with 3-μm axial resolution in retinal tissue and 47-kHz image acquisition rate...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28297339/deformable-image-registration-and-interobserver-variation-in-contour-propagation-for-radiation-therapy-planning
#9
Adam C Riegel, Jeffrey G Antone, Honglai Zhang, Prachi Jain, Jagdeep Raince, Anthony Rea, Angelo M Bergamo, Ajay Kapur, Louis Potters
Deformable image registration (DIR) and interobserver variation inevitably introduce uncertainty into the treatment planning process. The purpose of the current work was to measure deformable image registration (DIR) errors and interobserver variability for regions of interest (ROIs) in the head and neck and pelvic regions. Measured uncertainties were combined to examine planning margin adequacy for contours propagated for adaptive therapy and to assess the trade-off of DIR and interobserver uncertainty in atlas-based automatic segmentation...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295064/discrete-tuning-concept-for-fiber-integrated-lasers-based-on-tailored-fbg-arrays-and-a-theta-cavity-layout
#10
Tobias Tiess, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Matthias Jäger
We demonstrate a novel tuning concept for pulsed fiber-integrated lasers with a fiber Bragg grating (FBG) array as a discrete and tailored spectral filter, as well as a modified laser design. Based on a theta cavity layout, the structural delay lines originating from the FBG array are balanced, enabling a constant repetition rate and stable pulse properties over the full tuning range. The emission wavelength is electrically tuned with respect to the filter properties based on an adapted temporal gating scheme using an acousto-optic modulator...
March 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28291071/circinate-partition-like-findings-on-cone-mosaic-imaged-by-adaptive-optics-scanning-laser-ophthalmoscopy-in-eyes-with-inner-nuclear-layer-microcystic-changes
#11
Tomoko Hasegawa, Sotaro Ooto, Yukiko Makiyama, Masayuki Hata, Kazuaki Miyamoto, Nagahisa Yoshimura
PURPOSE: To report cases that showed partition-like, dark areas in the cone mosaic on adaptive optics scanning laser ophthalmoscopy (AO-SLO) images in eyes with inner nuclear layer (INL) microcystic changes. METHODS: Eyes with INL microcystic changes were imaged by prototype AO-SLO. RESULTS: An eye with Leber hereditary optic neuropathy, an eye with traumatic optic neuropathy, and an eye with retinitis pigmentosa that showed microcystic lesions in the INL were imaged by AO-SLO...
March 13, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28289715/cerebrovascular-adaptations-to-cocaine-induced-transient-ischemic-attacks-in-the-rodent-brain
#12
Jiang You, Nora D Volkow, Kicheon Park, Qiujia Zhang, Kevin Clare, Congwu Du, Yingtian Pan
Occurrence of transient ischemic attacks (TIA) and cerebral strokes is a recognized risk associated with cocaine abuse. Here, we use a rodent model along with optical imaging to study cocaine-induced TIA and the associated dynamic changes in cerebral blood flow velocity (CBFv) and cerebrovasculature. We show that chronic cocaine exposure in mice resulted in marked cortical hypoperfusion, in significant arterial and venous vasoconstriction, and in a sensitized vascular response to an acute cocaine injection...
March 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28287488/characterization-of-industrial-coolant-fluids-and-continuous-ageing-monitoring-by-wireless-node-enabled-fiber-optic-sensors
#13
Alexandros El Sachat, Anastasia Meristoudi, Christos Markos, Andreas Sakellariou, Aggelos Papadopoulos, Serafim Katsikas, Christos Riziotis
Environmentally robust chemical sensors for monitoring industrial processes or infrastructures are lately becoming important devices in industry. Low complexity and wireless enabled characteristics can offer the required flexibility for sensor deployment in adaptable sensing networks for continuous monitoring and management of industrial assets. Here are presented the design, development and operation of a class of low cost photonic sensors for monitoring the ageing process and the operational characteristics of coolant fluids used in an industrial heavy machinery infrastructure...
March 11, 2017: Sensors
https://www.readbyqxmd.com/read/28287484/time-of-travel-methods-for-measuring-optical-flow-on-board-a-micro-flying-robot
#14
Erik Vanhoutte, Stefano Mafrica, Franck Ruffier, Reinoud J Bootsma, Julien Serres
For use in autonomous micro air vehicles, visual sensors must not only be small, lightweight and insensitive to light variations; on-board autopilots also require fast and accurate optical flow measurements over a wide range of speeds. Using an auto-adaptive bio-inspired Michaelis-Menten Auto-adaptive Pixel (M 2 APix) analog silicon retina, in this article, we present comparative tests of two optical flow calculation algorithms operating under lighting conditions from 6 × 10 - 7 to 1 . 6 × 10 - 2 W·cm - 2 (i...
March 11, 2017: Sensors
https://www.readbyqxmd.com/read/28287450/autonomous-pointing-control-of-a-large-satellite-antenna-subject-to-parametric-uncertainty
#15
Shunan Wu, Yufei Liu, Gianmarco Radice, Shujun Tan
With the development of satellite mobile communications, large antennas are now widely used. The precise pointing of the antenna's optical axis is essential for many space missions. This paper addresses the challenging problem of high-precision autonomous pointing control of a large satellite antenna. The pointing dynamics are firstly proposed. The proportional-derivative feedback and structural filter to perform pointing maneuvers and suppress antenna vibrations are then presented. An adaptive controller to estimate actual system frequencies in the presence of modal parameters uncertainty is proposed...
March 10, 2017: Sensors
https://www.readbyqxmd.com/read/28286484/complex-visual-adaptations-in-squid-for-specific-tasks-in-different-environments
#16
Wen-Sung Chung, N Justin Marshall
In common with their major competitors, the fish, squid are fast moving visual predators that live over a great range of depths in the ocean. Both squid and fish show a variety of adaptations with respect to optical properties, receptors and their underlying neural circuits, and these adaptations are often linked to the light conditions of their specific niche. In contrast to the extensive investigations of adaptive strategies in fish, vision in response to the varying quantity and quality of available light, our knowledge of visual adaptations in squid remains sparse...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28285197/graphene-oxide-functionalized-long-period-grating-for-ultrasensitive-label-free-immunosensing
#17
Chen Liu, Qi Cai, Baojian Xu, Weidong Zhu, Lin Zhang, Jianlong Zhao, Xianfeng Chen
We explore graphene oxide (GO) nanosheets functionalized dual-peak long period grating (dLPG) based biosensor for ultrasensitive label-free antibody-antigen immunosensing. The GO linking layer provides a remarkable analytical platform for bioaffinity binding interface due to its favorable combination of exceptionally high surface-to-volume ratio and excellent optical and biochemical properties. A new GO deposition technique based on chemical-bonding in conjunction with physical-adsorption was proposed to offer the advantages of a strong bonding between GO and fiber device surface and a homogeneous GO overlay with desirable stability, repeatability and durability...
March 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28281262/streak-imaging-flow-cytometer-for-rare-cell-analysis
#18
Joshua Balsam, Hugh Alan Bruck, Miguel Ossandon, Ben Prickril, Avraham Rasooly
There is a need for simple and affordable techniques for cytology for clinical applications, especially for point-of-care (POC) medical diagnostics in resource-poor settings. However, this often requires adapting expensive and complex laboratory-based techniques that often require significant power and are too massive to transport easily. One such technique is flow cytometry, which has great potential for modification due to the simplicity of the principle of optical tracking of cells. However, it is limited in that regard due to the flow focusing technique used to isolate cells for optical detection...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28281260/low-cost-charged-coupled-device-ccd-based-detectors-for-shiga-toxins-activity-analysis
#19
Reuven Rasooly, Ben Prickril, Hugh A Bruck, Avraham Rasooly
To improve food safety there is a need to develop simple, low-cost sensitive devices for detection of food-borne pathogens and their toxins. We describe a simple, low-cost webcam-based detector which can be used for various optical detection modalities, including fluorescence, chemiluminescence, densitometry, and colorimetric assays. The portable battery-operated CCD-based detection system consists of four modules: (1) a webcam to measure and record light emission, (2) a sample plate to perform assays, (3) a light emitting diode (LED) for illumination, and (4) a portable computer to acquire and analyze images...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28280991/-adaptive-optics-in-ophthalmology
#20
EDITORIAL
W M Harmening
No abstract text is available yet for this article.
March 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
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