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https://www.readbyqxmd.com/read/28905426/optically-controlled-on-coil-amplifier-with-rf-monitoring-feedback
#1
Natalia Gudino, Jacco A de Zwart, Qi Duan, Stephen J Dodd, Joe Murphy-Boesch, Peter van Gelderen, Jeff H Duyn
PURPOSE: To develop a new optically controlled on-coil amplifier that facilitates safe use of multi-channel radiofrequency (RF) transmission in MRI by real-time monitoring of signal phase and amplitude. METHODS: Monitoring was carried out with a 4-channel prototype system by sensing, down sampling, digitizing, and optically transmitting the RF transmit signal to a remote PC to control the amplifiers. Performance was evaluated with benchtop and 7 T MRI experiments...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28895021/k-band-doppler-radar-for-contact-less-overnight-sleep-marker-assessment-a-pilot-validation-study
#2
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/28868212/high-density-mapping-of-brain-slices-using-a-large-multi-functional-high-density-cmos-microelectrode-array-system
#3
Vijay Viswam, Raziyeh Bounik, Amir Shadmani, Jelena Dragas, Marie Obien, Jan Müller, Yihui Chen, Andreas Hierlemann
We present a CMOS-based high-density microelectrode array (HD-MEA) system that enables high-density mapping of brain slices in-vitro with multiple readout modalities. The 4.48×2.43 mm(2) array consists of 59,760 micro-electrodes at 13.5 µm pitch (5487 electrodes/mm(2)). The overall system features 2048 action-potential, 32 local-field-potential and 32 current recording channels, 32 impedance-measurement and 28 neurotransmitter-detection channels and 16 voltage/current stimulation channels. The system enables real-time and label-free monitoring of position, size, morphology and electrical activity of brain slices...
June 2017: Int Solid State Sens Actuators Microsyst Conf
https://www.readbyqxmd.com/read/28863640/synchronous-acquisition-of-multi-channel-signals-by-single-channel-adc-based-on-square-wave-modulation
#4
Xiaoqing Yi, Liling Hao, Fangfang Jiang, Lisheng Xu, Shaoxiu Song, Gang Li, Ling Lin
Synchronous acquisition of multi-channel biopotential signals, such as electrocardiograph (ECG) and electroencephalograph, has vital significance in health care and clinical diagnosis. In this paper, we proposed a new method which is using single channel ADC to acquire multi-channel biopotential signals modulated by square waves synchronously. In this method, a specific modulate and demodulate method has been investigated without complex signal processing schemes. For each channel, the sampling rate would not decline with the increase of the number of signal channels...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28829322/success-rate-and-technical-quality-of-home-polysomnography-with-self-applicable-electrode-set-in-subjects-with-possible-sleep-bruxism
#5
Tomi Miettinen, Katja Myllymaa, Susanna Westeren-Punnonen, Jari Ahlberg, Taina Hukkanen, Juha Toyras, Reijo Lappalainen, Esa Mervaala, Kirsi Sipila, Sami Myllymaa
Using sleep laboratory polysomnography (PSG) is restricted for the diagnosis of only the most severe sleep disorders due to its low availability and high cost. Home PSG is more affordable, but applying conventional electroencephalography (EEG) electrodes increases its overall complexity and lowers the availability. Simple, self-administered single-channel EEG monitors on the other hand suffer from poor reliability. In this study, we aimed to quantify the reliability of self-administrated home PSG recordings conducted with a newly designed ambulatory electrode set (AES) that enables multi-channel EEG, electrooculography, electromyography and electrocardiography recordings...
August 18, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28792054/droplet-trapping-and-fast-acoustic-release-in-a-multi-height-device-with-steady-state-flow
#6
Richard W Rambach, Kevin Linder, Michael Heymann, Thomas Franke
We demonstrate a novel multilayer polydimethylsiloxane (PDMS) device for selective storage and release of single emulsion droplets. Drops are captured in a microchannel cavity and can be released on-demand through a triggered surface acoustic wave pulse. The surface acoustic wave (SAW) is excited by a tapered interdigital transducer (TIDT) deposited on a piezoelectric lithium niobate (LiNbO3) substrate and inverts the pressure difference across the cavity trap to push a drop out of the trap and back into the main flow channel...
August 9, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28769775/measuring-mental-workload-with-eeg-fnirs
#7
Haleh Aghajani, Marc Garbey, Ahmet Omurtag
We studied the capability of a Hybrid functional neuroimaging technique to quantify human mental workload (MWL). We have used electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) as imaging modalities with 17 healthy subjects performing the letter n-back task, a standard experimental paradigm related to working memory (WM). The level of MWL was parametrically changed by variation of n from 0 to 3. Nineteen EEG channels were covering the whole-head and 19 fNIRS channels were located on the forehead to cover the most dominant brain region involved in WM...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28762503/mechanomyography-based-wearable-monitor-of-quasi-isometric-muscle-fatigue-for-motor-neural-prostheses
#8
Eddy Krueger, Lana Popović-Maneski, Percy Nohama
A motor neural prosthesis based on surface functional electrical stimulation (sFES) can restore functional movement (e.g., standing, walking) in patients with a spinal cord injury (SCI). sFES generates muscle contractions in antigravity muscles and allows balance-assisted standing. This induced standing has several benefits, such as improved cardiovascular function, decreased incidence of urinary infections, reduced joint contractures, and muscle atrophy. The duration of sFES assisted standing is limited due to the quick onset of muscle fatigue...
August 1, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28669190/temperature-and-size-dependence-of-characteristic-hydrogen-bonded-network-structures-with-ion-core-switching-in-protonated-methanol-6-10-water-1-mixed-clusters-a-revisit
#9
Marusu Katada, Po-Jen Hsu, Asuka Fujii, Jer-Lai Kuo
Hydrogen-bonded network structures and preferential ion core in the protonated methanol-water mixed clusters, H(+)(methanol)n-(water)1 (n = 6-10), were explored by a combination of infrared spectroscopy and theoretical calculations. Infrared spectra of the OH stretch region of the clusters were measured at the two different temperature ranges by using Ar-tagging. Stable isomer structures of the clusters were searched by the multiscale modeling approach and temperature dependent infrared spectra were simulated based on the statistical populations of the isomers...
July 27, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28633068/multi-electrode-system-for-measurement-of-transmembrane-ion-fluxes-through-living-epithelial-cells
#10
Mirosław Zając, Andrzej Lewenstam, Krzysztof Dolowy
Cystic Fibrosis (CF) is the most common fatal human genetic disease. It is caused by the defect in a single anion channel protein which affects ion and water transport across the epithelial tissue. A flat multi-electrode platform of diameter 12mm, allowing for measurement of four ions: sodium, potassium, hydrogen and chloride by exchangeable/replaceable ion-selective electrodes is described. The measurement is possible owing to the architecture of the platform which accommodates all the electrodes and inlets/outlets...
October 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28624617/core-shell-iron-oxide-layered-double-hydroxide-high-electrochemical-sensing-performance-of-h2o2-biomarker-in-live-cancer-cells-with-plasma-therapeutics
#11
Muhammad Asif, Hongwei Liu, Ayesha Aziz, Haitao Wang, Zhengyun Wang, Muhammad Ajmal, Fei Xiao, Hongfang Liu
In this work, we develop a new type of multifunctional core-shell nanomaterial by controllable integration of CuAl layered double hydroxides (LDHs) over the surface of iron oxides (Fe3O4) nanospheres (NSs) to fabricate (Fe3O4@CuAl NSs) hybrid material with interior tunability of LDH phase and explore its practical application in ultrasensitive detection of emerging biomarker, i.e., H2O2 as cancer diagnostic probe. In addition, atmospheric pressure plasmas (APPs) have also been used as potential therapeutic approach for cancer treatment...
June 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28556952/a-miniaturized-sensor-for-detection-of-formaldehyde-fumes
#12
Gleb Zilberstein, Roman Zilberstein, Svetlana Zilberstein, Uriel Maor, Emmanuil Baskin, Shoumo Zhang, Pier Giorgio Righetti
A miniaturized chemical sensor is here described for the analysis of environmental pollutants (VOC: volatile organic chemicals). It is used for remote detection of formaldehyde (FA) fumes in the atmosphere, and is based on the redox reaction between FA and silver nitrate. The sensor is worn as a bracelet and the data acquired are transferred via a Bluetooth channel to a smartphone. A dedicated software transforms the signal from a grey to a color scale. The signal response has been assessed over low (20 to 120 ppb) as well as higher (1-15 ppm range) levels...
September 2017: Electrophoresis
https://www.readbyqxmd.com/read/28534810/non-invasive-fetal-monitoring-a-maternal-surface-ecg-electrode-placement-based-novel-approach-for-optimization-of-adaptive-filter-control-parameters-using-the-lms-and-rls-algorithms
#13
Radek Martinek, Radana Kahankova, Homer Nazeran, Jaromir Konecny, Janusz Jezewski, Petr Janku, Petr Bilik, Jan Zidek, Jan Nedoma, Marcel Fajkus
This paper is focused on the design, implementation and verification of a novel method for the optimization of the control parameters (such as step size μ and filter order N) of LMS and RLS adaptive filters used for noninvasive fetal monitoring. The optimization algorithm is driven by considering the ECG electrode positions on the maternal body surface in improving the performance of these adaptive filters. The main criterion for optimal parameter selection was the Signal-to-Noise Ratio (SNR). We conducted experiments using signals supplied by the latest version of our LabVIEW-Based Multi-Channel Non-Invasive Abdominal Maternal-Fetal Electrocardiogram Signal Generator, which provides the flexibility and capability of modeling the principal distribution of maternal/fetal ECGs in the human body...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28492345/the-focinator-v2-0-graphical-interface-four-channels-colocalization-analysis-and-cell-phase-identification
#14
Sebastian Oeck, Nathalie M Malewicz, Sebastian Hurst, Klaudia Al-Refae, Adam Krysztofiak, Verena Jendrossek
The quantitative analysis of foci plays an important role in various cell biological methods. In the fields of radiation biology and experimental oncology, the effect of ionizing radiation, chemotherapy or molecularly targeted drugs on DNA damage induction and repair is frequently performed by the analysis of protein clusters or phosphorylated proteins recruited to so called repair foci at DNA damage sites, involving for example γ-H2A.X, 53BP1 or RAD51. We recently developed "The Focinator" as a reliable and fast tool for automated quantitative and qualitative analysis of nuclei and DNA damage foci...
July 2017: Radiation Research
https://www.readbyqxmd.com/read/28481751/robust-heart-rate-from-fitness-videos
#15
Wenjin Wang, Albertus C den Brinker, Sander Stuijk, Gerard de Haan
Remote photoplethysmography (rPPG) enables contactless heart-rate monitoring using a regular video camera. OBJECTIVE: This paper aims to improve the rPPG technology targeting continuous heart-rate measurement during fitness exercises. The fundamental limitation of the existing (multi-wavelength) rPPG methods is that they can suppress at most n  -  1 independent distortions by linearly combining n wavelength color channels. Their performance are highly restricted when more than n  -  1 independent distortions appear in a measurement, as typically occurs in fitness applications with vigorous body motions...
May 8, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28474599/multi-feature-classifiers-for-burst-detection-in-single-eeg-channels-from-preterm-infants
#16
Xavier Navarro, Fabienne Poree, Mathieu Kuchenbuch, Mario Chavez, Alain Beuchée, Guy Carrault
<i>Objective</i>: The study of electroencephalographic (EEG) bursts in preterm infants provides valuable information about maturation or prognostication after perinatal asphyxia. Over the last two decades, a number of works proposed algorithms to automatically detect EEG bursts in preterm infants, but they were designed for populations under 35 weeks of post menstrual age (PMA). However, as the brain activity evolves rapidly during postnatal life, these solutions might be under-performing with increasing PMA...
May 5, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28463185/tr-breath-time-reversal-breathing-rate-estimation-and-detection
#17
Chen Chen, Yi Han, Yan Chen, Hung-Quoc Lai, Feng Zhang, Beibei Wang, K J Ray Liu
In this paper, we introduce TR-BREATH, a timereversal (TR) based contact-free breathing monitoring system. It is capable of breathing detection and multi-person breathing rate estimation within a short period of time using off-the-shelf WiFi devices. The proposed system exploits the channel state information (CSI) to capture the miniature variations in the environment caused by breathing. To magnify the CSI variations, TRBREATH projects CSIs into the TR resonating strength (TRRS) feature space and analyzes the TRRS by the Root-MUSIC and affinity propagation algorithms...
April 28, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28455820/a-review-of-source-tracking-techniques-for-fine-sediment-within-a-catchment
#18
REVIEW
Zhuo Guan, Xiang-Yu Tang, Jae E Yang, Yong Sik Ok, Zhihong Xu, Taku Nishimura, Brian J Reid
Excessive transport of fine sediment, and its associated pollutants, can cause detrimental impacts in aquatic environments. It is therefore important to perform accurate sediment source apportionment to identify hot spots of soil erosion. Various tracers have been adopted, often in combination, to identify sediment source type and its spatial origin; these include fallout radionuclides, geochemical tracers, mineral magnetic properties and bulk and compound-specific stable isotopes. In this review, the applicability of these techniques to particular settings and their advantages and limitations are reviewed...
April 28, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28444504/correction-of-parallel-transmission-using-concurrent-rf-and-gradient-field-monitoring
#19
Mustafa Çavuşoğlu, Benjamin Emanuel Dietrich, David Otto Brunner, Markus Weiger, Klaas Paul Pruessmann
OBJECTIVES: The accuracy and precision of the parallel RF excitations are highly dependent on the spatial and temporal fidelity of the magnetic fields involved in spin excitation. The consistency between the nominal and effective fields is typically limited by the imperfections of the employed hardware existing both in the gradient system and the RF chain. In this work, we experimentally presented highly improved spatially tailored parallel excitations by turning the native hardware accuracy challenge into a measurement and control problem using an advanced field camera technology to fully correct parallel RF transmission experiment...
April 25, 2017: Magma
https://www.readbyqxmd.com/read/28410579/assessing-the-usability-by-clinicians-of-vision-a-hierarchical-display-of-patient-collected-physiological-information-to-clinicians
#20
Cubby L Gardner, Fang Liu, Paul Fontelo, Michael C Flanagan, Albert Hoang, Harry B Burke
BACKGROUND: The inability of patients to accurately and completely recount their clinical status between clinic visits reduces the clinician's ability to properly manage their patients. One way to improve this situation is to collect objective patient information while the patients are at home and display the collected multi-day clinical information in parallel on a single screen, highlighting threshold violations for each channel, and allowing the viewer to drill down to any analog signal on the same screen, while maintaining the overall physiological context of the patient...
April 14, 2017: BMC Medical Informatics and Decision Making
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