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https://www.readbyqxmd.com/read/28922111/optimization-of-the-working-conditions-for-magnetic-nanoparticle-enhanced-microwave-diagnostics-of-breast-cancer
#1
Gennaro Bellizzi, Gennaro G Bellizzi, Ovidio M Bucci, Lorenzo Crocco, Marko Helbig, Sebastian Ley, Juergen Sachs
Magnetic nanoparticle-aided microwave imaging is recently gaining an increasing interest as potential tool for breast cancer diagnostics. This is due to the peculiar features of magnetic nanoparticles, which are biocompatible, can be selectively targeted to the tumor and may change their microwave magnetic response when modulated by a polarizing magnetic field. This latter aspect is particularly appealing, as it enables the physical separation of the microwave signal due the malignancy, targeted by the nanoparticles, from that due to healthy tissue...
September 18, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28921588/integrating-prior-information-into-microwave-tomography-part-2-impact-of-errors-in-prior-information-on-microwave-tomography-image-quality
#2
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors have developed a method to combine a patient-specific map of tissue structure and average dielectric properties with microwave tomography. The patient-specific map is acquired with radar-based techniques and serves as prior information for microwave tomography. The impact that the degree of structural detail included in this prior information has on image quality was reported in a previous investigation. The aim of the present study is to extend this previous work by identifying and quantifying the impact that errors in the prior information have on image quality, including the reconstruction of internal structures and lesions embedded in fibroglandular tissue...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28921580/integrating-prior-information-into-microwave-tomography-part-1-impact-of-detail-on-image-quality
#3
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors investigate the impact that incremental increases in the level of detail of patient-specific prior information have on image quality and the convergence behavior of an inversion algorithm in the context of near-field microwave breast imaging. A methodology is presented that uses image quality measures to characterize the ability of the algorithm to reconstruct both internal structures and lesions embedded in fibroglandular tissue. The approach permits key aspects that impact the quality of reconstruction of these structures to be identified and quantified...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28920499/tactile-radar-experimenting-a-computer-game-with-visually-disabled
#4
Virgínia Kastrup, Alvaro Cassinelli, Paulo Quérette, Niklas Bergstrom, Eliana Sampaio
BACKGROUND: Visually disabled people increasingly use computers in everyday life, thanks to novel assistive technologies better tailored to their cognitive functioning. Like sighted people, many are interested in computer games - videogames and audio-games. Tactile-games are beginning to emerge. The Tactile Radar is a device through which a visually disabled person is able to detect distal obstacles. In this study, it is connected to a computer running a tactile-game. The game consists in finding and collecting randomly arranged coins in a virtual room...
September 18, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28919936/polar-applications-of-spaceborne-scatterometers
#5
David G Long
Wind scatterometers were originally developed for observation of near-surface winds over the ocean. They retrieve wind indirectly by measuring the normalized radar cross section (σ(o) ) of the surface, and estimating the wind via a geophysical model function relating σ(o) to the vector wind. The σ(o) measurements have proven to be remarkably capable in studies of the polar regions where they can map snow cover; detect the freeze/thaw state of forest, tundra, and ice; map and classify sea ice; and track icebergs...
May 2017: IEEE J Sel Top Appl Earth Obs Remote Sens
https://www.readbyqxmd.com/read/28912622/local-and-systemic-immune-responses-to-influenza-a-virus-infection-in-pneumonia-and-encephalitis-mouse-models
#6
Yoshiharu Nagaoka, Nobuyuki Nosaka, Mutsuko Yamada, Masato Yashiro, Yosuke Washio, Kenji Baba, Tsuneo Morishima, Hirokazu Tsukahara
OBJECTIVE: To compare local and systemic profiles between different disease pathologies (pneumonia and encephalitis) induced by influenza A virus (IAV). METHODS: An IAV pneumonia model was created by intranasal inoculation of C57BL/6 mice with influenza A/WSN/33 (H1N1) virus. Lung lavage and blood collection were performed on day 3 after IAV inoculation. Similarly, an IAV encephalitis mouse model was created by direct intracranial IAV inoculation. Cerebrospinal fluid (CSF) and blood collection were conducted according to the same schedule...
2017: Disease Markers
https://www.readbyqxmd.com/read/28900202/pixelated-checkerboard-metasurface-for-ultra-wideband-radar-cross-section-reduction
#7
Mohammad-Javad Haji-Ahmadi, Vahid Nayyeri, Mohammad Soleimani, Omar M Ramahi
In this paper we designed and fabricated a metasurface working as a radar cross section (RCS) reducer over an ultra wide band of frequency from 3.8 to 10.7 GHz. The designed metasurface is a chessboard-like surface made of alternating tiles, with each tile composed of identical unit cells. We develop a novel, simple, highly robust and fully automated approach for designing the unit cells. First, a topology optimization algorithm is used to engineer the shape of the two unit cells. The area of each unit cell is pixelated...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900127/orbital-bistatic-radar-observations-of-asteroid-vesta-by-the-dawn-mission
#8
Elizabeth M Palmer, Essam Heggy, Wlodek Kofman
We present orbital bistatic radar observations of a small-body, acquired during occultation by the Dawn spacecraft at asteroid Vesta. The radar forward-scattering properties of different reflection sites are used to assess the textural properties of Vesta's surface at centimeter-to-decimeter scales and are compared to subsurface hydrogen concentrations observed by Dawn's Gamma Ray and Neutron Detector to assess potential volatile occurrence in the surface and shallow subsurface. We observe significant differences in surface radar reflectivity, implying substantial spatial variations in centimeter-to-decimeter-scale surface roughness...
September 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28895914/a-24-ghz-front-end-integrated-on-a-multilayer-cellulose-based-substrate-for-doppler-radar-sensors
#9
Federico Alimenti, Valentina Palazzi, Chiara Mariotti, Marco Virili, Giulia Orecchini, Stefania Bonafoni, Luca Roselli, Paolo Mezzanotte
This paper presents a miniaturized Doppler radar that can be used as a motion sensor for low-cost Internet of things (IoT) applications. For the first time, a radar front-end and its antenna are integrated on a multilayer cellulose-based substrate, built-up by alternating paper, glue and metal layers. The circuit exploits a distributed microstrip structure that is realized using a copper adhesive laminate, so as to obtain a low-loss conductor. The radar operates at 24 GHz and transmits 5 mW of power. The antenna has a gain of 7...
September 12, 2017: Sensors
https://www.readbyqxmd.com/read/28895021/k-band-doppler-radar-for-contact-less-overnight-sleep-marker-assessment-a-pilot-validation-study
#10
Rakesh Vasireddy, Corinne Roth, Johannes Mathis, Josef Goette, Marcel Jacomet, Andreas Vogt
An estimated 45 million persons in Europe are annually subjected to sleep-wake disorders. State-of-the-art polysomnography provides sophisticated insights into sleep (patho)physiology. A drawback of the method, however, is the obtrusive setting dependent on a clinical-based sleep laboratory with high operational costs. A contact-less prototype was developed to monitor limb movements and vital signs during sleep. A dual channel K-band Doppler radar transceiver captured limb movements and periodic chest wall motion due to respiration and heart activity...
September 11, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28889090/placing-the-radar-under-the-radar-ethics-of-public-health-surveillance
#11
Vijayaprasad Gopichandran
Public health surveillance (PHS) is an essential public health activity, which entails collecting data on diseases and disease-related states in a timely manner to aid in international health regulations and in local health planning. Opinions differ sharply on whether it is a research or non-research activity. In recent years, most low- and middle-income countries (LMICs) have been establishing their own PHS systems, with or without support from external donors, to comply with the stipulations of international health regulations...
August 16, 2017: Indian Journal of Medical Ethics
https://www.readbyqxmd.com/read/28887400/radar-dose-estimate-report-a-compendium-of-radiopharmaceutical-dose-estimates-based-on-olinda-exm-version-2-0
#12
Michael Stabin, Jeffry A Siegel
We present here a compendium of about 100 radiopharmaceuticals, using the new OLINDA/EXM version 2.0 software. A totally new generation of voxel-based, realistic human computational phantoms, based on 2007 recommendations of the International Commission on Radiological Protection (ICRP) was used to develop the phantoms, and the most recent biokinetic models were employed as well. These estimates should serve the worldwide user community for many years, and they can be modified and updated as models are changed, and new radiopharmaceuticals are added, as they will be maintained in electronic form...
September 8, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28875721/when-a-rash-has-two-names-pese-sorcery-and-kisigo-spirits-at-lake-tanganyika
#13
Eva Bleyenberg, Koen Stroeken
This explorative and qualitative study, based on 27 interviews during two months of fieldwork, describes pese, an affliction of the skin that has conspicuously stayed under the radar of medico-anthropological research in Kigoma, a rural city in the northwest Tanzania. The condition reminds of a locally better known condition labeled kisigo, raising the question why two concepts of the same affliction exist side by side. It seems indicative that the two illness concepts stem from different cultures and that each specializes in an explanatory model: the former witchcraft (sorcery) and the latter spirit possession...
September 6, 2017: Anthropology & Medicine
https://www.readbyqxmd.com/read/28872752/time-on-androgen-deprivation-therapy-and-adaptations-to-exercise-secondary-analysis-from-a-12-month-randomized-controlled-trial-in-men-with-prostate-cancer
#14
Dennis R Taaffe, Laurien M Buffart, Robert U Newton, Nigel Spry, James Denham, David Joseph, David Lamb, Suzanne K Chambers, Daniel A Galvão
OBJECTIVES: To explore if duration of prior exposure to androgen deprivation therapy (ADT) in men with prostate cancer (PCa) undertaking a yearlong exercise program moderates the exercise response on body composition and muscle performance. In addition, we explored the moderator effect of baseline testosterone, time since ADT, and baseline value of the outcome. PATIENTS AND METHODS: In a multicenter randomized controlled trial, 100 patients previously treated for either 6 months (short-term) or 18 months (long-term) ADT in combination with radiotherapy as part of the TROG 03...
September 5, 2017: BJU International
https://www.readbyqxmd.com/read/28867814/identification-of-potential-high-risk-habitats-within-the-transmission-reach-of-oncomelania-hupensis-after-floods-based-on-sar-techniques-in-a-plane-region-in-china
#15
Yuanyuan Shi, Juan Qiu, Rendong Li, Qiang Shen, Duan Huang
Schistosomiasis japonica is an infectious disease caused by Schistosoma japonicum, and it remains endemic in China. Flooding is the main hazard factor, as it causes the spread of Oncomelania hupensis, the only intermediate host of Schistosoma japonicum, thereby triggering schistosomiasis outbreaks. Based on multi-source real-time remote sensing data, we used remote sensing (RS) technology, especially synthetic aperture radar (SAR), and geographic information system (GIS) techniques to carry out warning research on potential snail habitats within the snail dispersal range following flooding...
August 30, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28867776/multi-ray-model-for-near-ground-millimeter-wave-radar
#16
Ariel Etinger, Boris Litvak, Yosef Pinhasi
A quasi-optical multi-ray model for a short-range millimeter wave radar is presented. The model considers multi-path effects emerging while multiple rays are scattered from the target and reflected to the radar receiver. Among the examined scenarios, the special case of grazing ground reflections is analyzed. Such a case becomes relevant when short range anti-collision radars are employed in vehicles. Such radars operate at millimeter wavelengths, and are aimed at the detection of targets located several tens of meters from the transmitter...
August 30, 2017: Sensors
https://www.readbyqxmd.com/read/28866498/random-walks-for-synthetic-aperture-radar-image-fusion-in-framelet-domain
#17
Xiaoyuan Yang, Jingkai Wang, Ridong Zhu
A new framelet-based random walks (RW) method is presented for synthetic aperture radar (SAR) image fusion, including SAR-visible images, SAR-infrared images and Multiband SAR images. In this method, we build a novel random walks model based on the statistical characteristics of framelet coefficients to fuse the high-frequency and low-frequency coefficients. This model converts the fusion problem to estimate the probability of each framelet coefficient being assigned each input image. Experimental results show that the proposed approach improves the contrast while preserves the edges simultaneously, and outperforms many traditional and state-of-the-art fusion techniques in both qualitative and quantitative analysis...
August 30, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28865808/monitoring-the-evolution-and-migration-of-a-methane-gas-plume-in-an-unconfined-sandy-aquifer-using-time-lapse-gpr-and-ert
#18
Colby M Steelman, Dylan R Klazinga, Aaron G Cahill, Anthony L Endres, Beth L Parker
Fugitive methane (CH4) leakage associated with conventional and unconventional petroleum development (e.g., shale gas) may pose significant risks to shallow groundwater. While the potential threat of stray (CH4) gas in aquifers has been acknowledged, few studies have examined the nature of its migration and fate in a shallow groundwater flow system. This study examines the geophysical responses observed from surface during a 72day field-scale simulated CH4 leak in an unconfined sandy aquifer at Canadian Forces Base Borden, Canada, to better understand the transient behaviour of fugitive CH4 gas in the subsurface...
August 30, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28862658/multi-mode-gf-3-satellite-image-geometric-accuracy-verification-using-the-rpc-model
#19
Taoyang Wang, Guo Zhang, Lei Yu, Ruishan Zhao, Mingjun Deng, Kai Xu
The GaoFen-3 (GF-3) satellite is the first C-band multi-polarization synthetic aperture radar (SAR) imaging satellite with a resolution up to 1 m in China. It is also the only SAR satellite of the High-Resolution Earth Observation System designed for civilian use. There are 12 different imaging models to meet the needs of different industry users. However, to use SAR satellite images for related applications, they must possess high geometric accuracy. In order to verify the geometric accuracy achieved by the different modes of GF-3 images, we analyze the SAR geometric error source and perform geometric correction tests based on the RPC model with and without ground control points (GCPs) for five imaging modes...
September 1, 2017: Sensors
https://www.readbyqxmd.com/read/28854262/accurate-measurement-of-chest-compression-depth-using-impulse-radio-ultra-wideband-sensor-on-a-mattress
#20
Byung Gyu Yu, Je Hyeok Oh, Yeomyung Kim, Tae Wook Kim
OBJECTIVE: We developed a new chest compression depth (CCD) measuring technology using radar and impulse-radio ultra-wideband (IR-UWB) sensor. This study was performed to determine its accuracy on a soft surface. METHODS: Four trials, trial 1: chest compressions on the floor using an accelerometer device; trial 2: chest compressions on the floor using an IR-UWB sensor; trial 3: chest compressions on a foam mattress using an accelerometer device; trial 4: chest compressions on a foam mattress using an IR-UWB sensor, were performed in a random order...
2017: PloS One
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