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https://www.readbyqxmd.com/read/28106718/an-improved-high-sensitivity-airborne-transient-electromagnetic-sensor-for-deep-penetration
#1
Shudong Chen, Shuxu Guo, Haofeng Wang, Miao He, Xiaoyan Liu, Yu Qiu, Shuang Zhang, Zhiwen Yuan, Haiyang Zhang, Dong Fang, Jun Zhu
The investigation depth of transient electromagnetic sensors can be effectively increased by reducing the system noise, which is mainly composed of sensor internal noise, electromagnetic interference (EMI), and environmental noise, etc. A high-sensitivity airborne transient electromagnetic (AEM) sensor with low sensor internal noise and good shielding effectiveness is of great importance for deep penetration. In this article, the design and optimization of such an AEM sensor is described in detail. To reduce sensor internal noise, a noise model with both a damping resistor and a preamplifier is established and analyzed...
January 17, 2017: Sensors
https://www.readbyqxmd.com/read/28104089/prediction-of-radiofrequency-ablation-lesion-formation-using-a-novel-temperature-sensing-technology-incorporated-in-a-force-sensing-catheter
#2
Guy Rozen, Leon Ptaszek, Israel Zilberman, Kevin Cordaro, E Kevin Heist, Christopher Beeckler, Andres Altmann, Zhang Ying, Zhenjiang Liu, Jeremy N Ruskin, Assaf Govari, Moussa Mansour
BACKGROUND: Real-time radiofrequency (RF) ablation lesion assessment is a major unmet need in cardiac electrophysiology. OBJECTIVE: The purpose of this study was to assess whether improved temperature measurement using a novel thermocoupling (TC) technology combined with information derived from impedance change, contact force (CF) sensing, and catheter orientation allows accurate real-time prediction of ablation lesion formation. METHODS: RF ablation lesions were delivered in the ventricles of 15 swine using a novel externally irrigated-tip catheter containing 6 miniature TC sensors in addition to force sensing technology...
February 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28103193/comprehensive-use-of-curvature-for-robust-and-accurate-online-surface-reconstruction
#3
Damien Lefloch, Markus Kluge, Hamed Sarbolandi, Tim Weyrich, Andreas Kolb
Interactive real-time scene acquisition from hand-held depth cameras has recently developed much momentum, enabling applications in ad-hoc object acquisition, augmented reality and other fields. A key challenge to online reconstruction remains error accumulation in the reconstructed camera trajectory, due to drift-inducing instabilities in the range scan alignments of the underlying iterative-closest-point (ICP) algorithm. Various strategies have been proposed to mitigate that drift, including SIFT-based pre-alignment, color-based weighting of ICP pairs, stronger weighting of edge features, and so on...
January 5, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28077710/sensory-flow-as-a-basis-for-a-novel-distance-cue-in-freely-behaving-electric-fish
#4
Volker Hofmann, Juan Ignacio Sanguinetti-Scheck, Leonel Gómez-Sena, Jacob Engelmann
: The sensory input that an animal receives is directly linked to its motor activity. Behavior thus enables animals to influence their sensory input, a concept referred to as active sensing. How such behavior can serve as a scaffold for generating sensory information is of general scientific interest. In this article, we investigate how behavior can shape sensory information by using some unique features of the sensorimotor system of the weakly electric fish. Based on quantitative behavioral characterizations and computational reconstruction of sensory input, we show how electrosensory flow is actively created during highly patterned, spontaneous behavior in Gnathonemus petersii...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28074939/the-influence-of-tip-shape-on-bending-force-during-needle-insertion
#5
Nick J van de Berg, Tonke L de Jong, Dennis J van Gerwen, Jenny Dankelman, John J van den Dobbelsteen
Steering of needles involves the planning and timely modifying of instrument-tissue force interactions to allow for controlled deflections during the insertion in tissue. In this work, the effect of tip shape on these forces was studied using 10 mm diameter needle tips. Six different tips were selected, including beveled and conical versions, with or without pre-bend or pre-curve. A six-degree-of-freedom force/torque sensor measured the loads during indentations in tissue simulants. The increased insertion (axial) and bending (radial) forces with insertion depth - the force-displacement slopes - were analyzed...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067767/depth-errors-analysis-and-correction-for-time-of-flight-tof-cameras
#6
Ying He, Bin Liang, Yu Zou, Jin He, Jun Yang
Time-of-Flight (ToF) cameras, a technology which has developed rapidly in recent years, are 3D imaging sensors providing a depth image as well as an amplitude image with a high frame rate. As a ToF camera is limited by the imaging conditions and external environment, its captured data are always subject to certain errors. This paper analyzes the influence of typical external distractions including material, color, distance, lighting, etc. on the depth error of ToF cameras. Our experiments indicated that factors such as lighting, color, material, and distance could cause different influences on the depth error of ToF cameras...
January 5, 2017: Sensors
https://www.readbyqxmd.com/read/28059500/control-and-monitoring-of-dye-distribution-in-mesoporous-tio2-film-for-improving-photovoltaic-performance
#7
Byung-Man Kim, Hyun-Gyu Han, Jeong Soo Kim, HyeonOh Shin, Tae-Hyuk Kwon
Dye distribution in a mesoporous TiO2 film is a key factor in the performance of dye-sensitized solar cells, but there has been little research on it. Here we report even dye distribution within the porous TiO2 film achieved by a physical driving force of gas flow. Gas-assisted dye arrangement, gas bubbling soaking (GBS), significantly accelerates the dye infiltration compared to conventional overnight soaking (OS). As a demonstration, we investigated the time-dependent dye infiltration using plasmon sensors...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28048831/su-g-jep4-01-an-assessment-of-a-microsoft-kinect-v2-sensor-for-voluntary-breath-hold-monitoring-in-radiotherapy
#8
D Edmunds, E Donovan
PURPOSE: To determine whether the Microsoft Kinect Version 2 (Kinect v2), a commercial off-the-shelf (COTS) depth sensors designed for entertainment purposes, were robust to the radiotherapy treatment environment and could be suitable for monitoring of voluntary breath-hold compliance. This could complement current visual monitoring techniques, and be useful for heart sparing left breast radiotherapy. METHODS: In-house software to control Kinect v2 sensors, and capture output information, was developed using the free Microsoft software development kit, and the Cinder creative coding C++ library...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048329/su-g-jep1-14-respiratory-motion-tracking-using-kinect-v2
#9
E Silverstein, M Snyder
PURPOSE: Investigate capability and accuracy of Kinect v2 camera for tracking respiratory motion to use as a tool during 4DCT or in combination with motion management during radiotherapy treatments. METHODS: Utilizing the depth sensor on the Kinect as well as code written in C#, the respiratory motion of a patient was tracked by recording the depth (distance) values obtained at several points on the patient. Respiratory traces were also obtained using Varian's RPM system, which traces the movement of a propriety marker placed on the patient's abdomen, as well as an Anzai belt, which utilizes a pressure sensor to track respiratory motion...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047557/su-g-tep2-15-feasibility-study-of-fiber-optic-cerenkov-radiation-sensors-for-in-vivo-measurement-dosimetric-characterization-and-clinical-application-in-proton-beams
#10
J Lah, J Son, G Kim, D Shin
PURPOSE: To evaluate the possibility of a fiber-optic Cerenkov radiation sensor (FCRS) for in vivo dose verification in proton therapy. METHODS: The Cerenkov radiation due to the proton beam was measured using a homemade phantom, consisting of a plastic optical fiber (POF, PGSCD1001-13-E, Toray, Tokyo, Japan) connected to each channel of a multianode photomultiplier tube (MAPMT:H7546, Hamamatsu Photonics, Shizuoka, Japan). Data were acquired using a multi-anode photomultiplier tube with the NI-DAQ system (National Instruments Texas, USA)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047437/su-f-j-206-systematic-evaluation-of-the-minimum-detectable-shift-using-a-range-finding-camera
#11
M Platt, M Platt, M Lamba, A Mascia, K Huang
PURPOSE: The robotic table used for patient alignment in proton therapy is calibrated only at commissioning under well-defined conditions and table shifts may vary over time and with differing conditions. The purpose of this study is to systematically investigate minimum detectable shifts using a time-of-flight (TOF) range-finding camera for table position feedback. METHODS: A TOF camera was used to acquire one hundred 424 × 512 range images from a flat surface before and after known shifts...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046161/technical-note-estimating-body-weight-and-body-composition-of-beef-cattle-trough-digital-image-analysis
#12
R A Gomes, G R Monteiro, G J F Assis, K C Busato, M M Ladeira, M L Chizzotti
The use of digital images could be a faster and cheaper alternative technique to assess BW, HCW, and body composition of beef cattle. The objective of this study was to develop equations to predict body and carcass weight and body fat content of young bulls using digital images obtained through a Microsoft Kinect device. Thirty-five bulls with an initial BW of 383 (±5.38) kg (20 Black Angus, 390 [±7.48] kg initial BW, and 15 Nellore, 377 [±8.66] kg initial BW) were used. The Kinect sensor, installed on the top of a cattle chute, was used to take infrared light-based depth videos, recorded before the slaughter...
December 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/28045895/a-framework-for-analyzing-the-whole-body-surface-area-from-a-single-view
#13
Marco Piccirilli, Gianfranco Doretto, Donald Adjeroh
We present a virtual reality (VR) framework for the analysis of whole human body surface area. Usual methods for determining the whole body surface area (WBSA) are based on well known formulae, characterized by large errors when the subject is obese, or belongs to certain subgroups. For these situations, we believe that a computer vision approach can overcome these problems and provide a better estimate of this important body indicator. Unfortunately, using machine learning techniques to design a computer vision system able to provide a new body indicator that goes beyond the use of only body weight and height, entails a long and expensive data acquisition process...
2017: PloS One
https://www.readbyqxmd.com/read/28027798/improved-deep-two-photon-calcium-imaging-in-vivo
#14
REVIEW
Antje Birkner, Carsten H Tischbirek, Arthur Konnerth
Two-photon laser scanning calcium imaging has emerged as a useful method for the exploration of neural function and structure at the cellular and subcellular level in vivo. The applications range from imaging of subcellular compartments such as dendrites, spines and axonal boutons up to the functional analysis of large neuronal or glial populations. However, the depth penetration is often limited to a few hundred micrometers, corresponding, for example, to the upper cortical layers of the mouse brain. Light scattering and aberrations originating from refractive index inhomogeneties of the tissue are the reasons for these limitations...
December 21, 2016: Cell Calcium
https://www.readbyqxmd.com/read/28026192/the-fulfillment-of-others-needs-elevates-children-s-body-posture
#15
Robert Hepach, Amrisha Vaish, Michael Tomasello
Much is known about young children's helping behavior, but little is known about the underlying motivations and emotions involved. In 2 studies we found that 2-year-old children showed positive emotions of similar magnitude-as measured by changes in their postural elevation using depth sensor imaging technology-after they achieved a goal for themselves and after they helped another person achieve her goal. Conversely, children's posture decreased in elevation when their actions did not result in a positive outcome...
January 2017: Developmental Psychology
https://www.readbyqxmd.com/read/28025524/a-multi-sensor-fusion-mav-state-estimation-from-long-range-stereo-imu-gps-and-barometric-sensors
#16
Yu Song, Stephen Nuske, Sebastian Scherer
State estimation is the most critical capability for MAV (Micro-Aerial Vehicle) localization, autonomous obstacle avoidance, robust flight control and 3D environmental mapping. There are three main challenges for MAV state estimation: (1) it can deal with aggressive 6 DOF (Degree Of Freedom) motion; (2) it should be robust to intermittent GPS (Global Positioning System) (even GPS-denied) situations; (3) it should work well both for low- and high-altitude flight. In this paper, we present a state estimation technique by fusing long-range stereo visual odometry, GPS, barometric and IMU (Inertial Measurement Unit) measurements...
December 22, 2016: Sensors
https://www.readbyqxmd.com/read/28009845/improvement-of-depth-profiling-into-biotissues-using-micro-electrical-impedance-spectroscopy-on-a-needle-with-selective-passivation
#17
Joho Yun, Hyeon Woo Kim, Jong-Hyun Lee
A micro electrical impedance spectroscopy (EIS)-on-a-needle for depth profiling (μEoN-DP) with a selective passivation layer (SPL) on a hypodermic needle was recently fabricated to measure the electrical impedance of biotissues along with the penetration depths. The SPL of the μEoN-DP enabled the sensing interdigitated electrodes (IDEs) to contribute predominantly to the measurement by reducing the relative influence of the connection lines on the sensor output. The discrimination capability of the μEoN-DP was verified using phosphate-buffered saline (PBS) at various concentration levels...
December 21, 2016: Sensors
https://www.readbyqxmd.com/read/27999252/a-visualization-method-for-corrosion-damage-on-aluminum-plates-using-an-nd-yag-pulsed-laser-scanning-system
#18
Inbok Lee, Aoqi Zhang, Changgil Lee, Seunghee Park
This paper proposes a non-contact nondestructive evaluation (NDE) technique that uses laser-induced ultrasonic waves to visualize corrosion damage in aluminum alloy plate structures. The non-contact, pulsed-laser ultrasonic measurement system generates ultrasonic waves using a galvanometer-based Q-switched Nd:YAG laser and measures the ultrasonic waves using a piezoelectric (PZT) sensor. During scanning, a wavefield can be acquired by changing the excitation location of the laser point and measuring waves using the PZT sensor...
December 16, 2016: Sensors
https://www.readbyqxmd.com/read/27992321/robo-psychophysics-extracting-behaviorally-relevant-features-from-the-output-of-sensors-on-a-prosthetic-finger
#19
Benoit P Delhaye, Erik W Schluter, Sliman J Bensmaia
Efforts are underway to restore sensorimotor function in amputees and tetraplegic patients using anthropomorphic robotic hands. For this approach to be clinically viable, sensory signals from the hand must be relayed back to the patient. To convey tactile feedback necessary for object manipulation, behaviorally relevant information must be extracted in real time from the output of sensors on the prosthesis. In the present study, we recorded the sensor output from a state-of-the-art bionic finger during the presentation of different tactile stimuli, including punctate indentations and scanned textures...
October 2016: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/27981837/the-floatability-of-single-spheres-versus-their-pairs-on-the-water-surface
#20
Dong-Xia Feng, Anh V Nguyen
Particle floatability at the water surface encountered in nature and industrial systems often occurs in the presence of many particles, but the available theoretical developments are based on the flotation of single particles. Here experiments were conducted to compare the floatabilities of single and multiple spheres on the air-water interfaces. Specifically, the forces on floating single spheres and their pairs versus the depth of deformed interface were measured using a force sensor combined with high-speed video microscopy and modeled based on the 3D Young-Laplace equation which was numerically solved...
December 27, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
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