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https://www.readbyqxmd.com/read/29223565/compressively-sampled-mr-image-reconstruction-using-generalized-thresholding-iterative-algorithm
#1
Sana Elahi, Muhammad Kaleem, Hammad Omer
Compressed sensing (CS) is an emerging area of interest in Magnetic Resonance Imaging (MRI). CS is used for the reconstruction of the images from a very limited number of samples in k-space. This significantly reduces the MRI data acquisition time. One important requirement for signal recovery in CS is the use of an appropriate non-linear reconstruction algorithm. It is a challenging task to choose a reconstruction algorithm that would accurately reconstruct the MR images from the under-sampled k-space data...
November 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29222728/fetal-electrocardiogram-extraction-and-analysis-using-adaptive-noise-cancellation-and-wavelet-transformation-techniques
#2
P Sutha, V E Jayanthi
Birth defect-related demise is mainly due to congenital heart defects. In the earlier stage of pregnancy, fetus problem can be identified by finding information about the fetus to avoid stillbirths. The gold standard used to monitor the health status of the fetus is by Cardiotachography(CTG), cannot be used for long durations and continuous monitoring. There is a need for continuous and long duration monitoring of fetal ECG signals to study the progressive health status of the fetus using portable devices. The non-invasive method of electrocardiogram recording is one of the best method used to diagnose fetal cardiac problem rather than the invasive methods...
December 8, 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/29220640/invariants-in-probabilistic-reasoning
#3
Fintan Costello, Paul Watts
Recent research has identified three invariants or identities that appear to hold in people's probabilistic reasoning: the QQ identity, the addition law identity, and the Bayes rule identity (Costello and Watts, 2014, 2016a, Fisher and Wolfe, 2014, Wang and Busemeyer, 2013, Wang et al., 2014). Each of these identities represent specific agreement with the requirements of normative probability theory; strikingly, these identities seem to hold in people's judgements despite the presence of strong and systematic biases against the requirements of normative probability theory in those very same judgements...
December 5, 2017: Cognitive Psychology
https://www.readbyqxmd.com/read/29219599/error-mitigation-for-short-depth-quantum-circuits
#4
Kristan Temme, Sergey Bravyi, Jay M Gambetta
Two schemes are presented that mitigate the effect of errors and decoherence in short-depth quantum circuits. The size of the circuits for which these techniques can be applied is limited by the rate at which the errors in the computation are introduced. Near-term applications of early quantum devices, such as quantum simulations, rely on accurate estimates of expectation values to become relevant. Decoherence and gate errors lead to wrong estimates of the expectation values of observables used to evaluate the noisy circuit...
November 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29195337/multi-gbit-s-optical-phase-chaos-communications-using-a-time-delayed-optoelectronic-oscillator-with-a-three-wave-interferometer-nonlinearity
#5
Jérémy Oden, Roman Lavrov, Yanne K Chembo, Laurent Larger
We propose a chaos communication scheme based on a chaotic optical phase carrier generated with an optoelectronic oscillator with nonlinear time-delay feedback. The system includes a dedicated non-local nonlinearity, which is a customized three-wave imbalanced interferometer. This particular feature increases the complexity of the chaotic waveform and thus the security of the transmitted information, as these interferometers are characterized by four independent parameters which are part of the secret key for the chaos encryption scheme...
November 2017: Chaos
https://www.readbyqxmd.com/read/29187230/decreasing-delirium-through-music-ddm-in-critically-ill-mechanically-ventilated-patients-in-the-intensive-care-unit-study-protocol-for-a-pilot-randomized-controlled-trial
#6
Sikandar H Khan, Sophia Wang, Amanda Harrawood, Stephanie Martinez, Annie Heiderscheit, Linda Chlan, Anthony J Perkins, Wanzhu Tu, Malaz Boustani, Babar Khan
BACKGROUND: Delirium is a highly prevalent and morbid syndrome in intensive care units (ICUs). Changing the stressful environment within the ICU via music may be an effective and a scalable way to reduce the burden of delirium. METHODS/DESIGN: The Decreasing Delirium through Music (DDM) study is a three-arm, single-blind, randomized controlled feasibility trial. Sixty patients admitted to the ICU with respiratory failure requiring mechanical ventilation will be randomized to one of three arms (20 participants per arm): (1) personalized music, (2) non-personalized relaxing music, or (3) attention-control...
November 29, 2017: Trials
https://www.readbyqxmd.com/read/29102826/a-motion-tolerant-approach-for-monitoring-spo2-and-heart-rate-using-photoplethysmography-signal-with-dual-frame-length-processing-and-multi-classifier-fusion
#7
Feiyi Fan, Yuepeng Yan, Yongzhong Tang, Hao Zhang
Monitoring pulse oxygen saturation (SpO2) and heart rate (HR) using photoplethysmography (PPG) signal contaminated by a motion artifact (MA) remains a difficult problem, especially when the oximeter is not equipped with a 3-axis accelerometer for adaptive noise cancellation. In this paper, we report a pioneering investigation on the impact of altering the frame length of Molgedey and Schuster independent component analysis (ICAMS) on performance, design a multi-classifier fusion strategy for selecting the PPG correlated signal component, and propose a novel approach to extract SpO2 and HR readings from PPG signal contaminated by strong MA interference...
November 2, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29099190/singular-value-decomposition-method-to-determine-distance-distributions-in-pulsed-dipolar-electron-spin-resonance
#8
Madhur Srivastava, Jack H Freed
Regularization is often utilized to elicit the desired physical results from experimental data. The recent development of a denoising procedure yielding about 2 orders of magnitude in improvement in SNR obviates the need for regularization, which achieves a compromise between canceling effects of noise and obtaining an estimate of the desired physical results. We show how singular value decomposition (SVD) can be employed directly on the denoised data, using pulse dipolar electron spin resonance experiments as an example...
November 7, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29060769/automatic-atrial-fibrillation-detection-a-novel-approach-using-discrete-wavelet-transform-and-heart-rate-variability
#9
Iben H Bruun, Semira M S Hissabu, Erik S Poulsen, Sadasivan Puthusserypady
Early detection of Atrial Fibrillation (AF) is crucial in order to prevent acute and chronic cardiac rhythm disorders. In this study, a novel method for robust automatic AF detection (AAFD) is proposed by combining atrial activity (AA) and heart rate variability (HRV), which could potentially be used as a screening tool for patients suspected to have AF. The method includes an automatic peak detection prior to the feature extraction, as well as a noise cancellation technique followed by a bagged tree classification...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060123/a-novel-acoustic-catheter-stethoscope-based-acquisition-and-signal-processing-framework-to-extract-multiple-bio-signals
#10
Prashanth Chetlur Adithya, Ravi Sankar, Wilfrido A Moreno, Stuart Hart
In this study, a novel acoustic stethoscope based on an intravenous catheter was introduced to measure vascular pressures from a Yorkshire pig. Our hypothesis is that by means of this single device (measurement system) and by applying signal analysis and processing framework, multiple vital bio signals can be extracted. In contrast, current conventional state-of-the-art technologies use multiple devices to provide the same information. The framework used to extract these bio signals consisted of a noise cancellation technique and wavelet based source separation...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060008/a-low-power-high-sensitivity-analog-front-end-for-ppg-sensor
#11
Binghui Lin, Mohamed Atef, Guoxing Wang
This paper presents a low-power analog front-end (AFE) photoplethysmography (PPG) sensor fabricated in 0.35 μm CMOS process. The AFE amplifies the weak photocurrent from the photodiode (PD) and converts it to a strong voltage at the output. In order to decrease the power consumption, the circuits are designed in subthreshold region; so the total biasing current of the AFE is 10 μ A. Since the large input DC photocurrent is a big issue for the PPG sensing circuit, we apply a DC photocurrent rejection technique by adding a DC current-cancellation loop to reject the large DC photocurrent up to 10 μA...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29043462/an-experimental-model-to-measure-the-ability-of-headphones-with-active-noise-control-to-reduce-patient-s-exposure-to-noise-in-an-intensive-care-unit
#12
Stuart Gallacher, Doyo Enki, Sian Stevens, Mark J Bennett
BACKGROUND: Defining the association between excessive noise in intensive care units, sleep disturbance and morbidity, including delirium, is confounded by the difficulty of implementing successful strategies to reduce patient's exposure to noise. Active noise control devices may prove to be useful adjuncts but there is currently little to quantify their ability to reduce noise in this complex environment. METHODS: Sound meters were embedded in the auditory meatus of three polystyrene model heads with no headphones (control), with headphones alone and with headphones using active noise control and placed in patient bays in a cardiac ICU...
October 17, 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/29042519/balanced-excitation-and-inhibition-are-required-for-high-capacity-noise-robust-neuronal-selectivity
#13
Ran Rubin, L F Abbott, Haim Sompolinsky
Neurons and networks in the cerebral cortex must operate reliably despite multiple sources of noise. To evaluate the impact of both input and output noise, we determine the robustness of single-neuron stimulus selective responses, as well as the robustness of attractor states of networks of neurons performing memory tasks. We find that robustness to output noise requires synaptic connections to be in a balanced regime in which excitation and inhibition are strong and largely cancel each other. We evaluate the conditions required for this regime to exist and determine the properties of networks operating within it...
October 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29041685/performance-analysis-of-an-oam-multiplexing-based-mimo-fso-system-over-atmospheric-turbulence-using-space-time-coding-with-channel-estimation
#14
Yan Zhang, Ping Wang, Lixin Guo, Wei Wang, Hongxin Tian
The average bit error rate (ABER) performance of an orbital angular momentum (OAM) multiplexing-based free-space optical (FSO) system with multiple-input multiple-output (MIMO) architecture has been investigated over atmospheric turbulence considering channel estimation and space-time coding. The impact of different types of space-time coding, modulation orders, turbulence strengths, receive antenna numbers on the transmission performance of this OAM-FSO system is also taken into account. On the basis of the proposed system model, the analytical expressions of the received signals carried by the k-th OAM mode of the n-th receive antenna for the vertical bell labs layered space-time (V-Blast) and space-time block codes (STBC) are derived, respectively...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/28906239/auditory-processing-testing-in-the-booth-versus-outside-the-booth
#15
Jay R Lucker
BACKGROUND: Many audiologists believe that auditory processing testing must be carried out in a soundproof booth. This expectation is especially a problem in places such as elementary schools. Research comparing pure-tone thresholds obtained in sound booths compared to quiet test environments outside of these booths does not support that belief. Auditory processing testing is generally carried out at above threshold levels, and therefore may be even less likely to require a soundproof booth...
September 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28891927/differential-cmos-sub-terahertz-detector-with-subthreshold-amplifier
#16
Jong-Ryul Yang, Seong-Tae Han, Donghyun Baek
We propose a differential-type complementary metal-oxide-semiconductor (CMOS) sub-terahertz (THz) detector with a subthreshold preamplifier. The proposed detector improves the voltage responsivity and effective signal-to-noise ratio (SNR) using the subthreshold preamplifier, which is located between the differential detector device and main amplifier. The overall noise of the detector for the THz imaging system is reduced by the preamplifier because it diminishes the noise contribution of the main amplifier...
September 9, 2017: Sensors
https://www.readbyqxmd.com/read/28885153/three-dimensional-single-track-location-shear-wave-elasticity-imaging-stl-swei
#17
Peter Hollender, Samantha Lipman, Gregg Trahey
Conventional multiple track location shear wave elasticity imaging (MTL-SWEI) is a powerful tool for noninvasively estimating tissue elasticity. The resolution and noise levels of MTL-SWEI systems, however, are limited by ultrasound speckle. Single track location SWEI (STL-SWEI) is a novel variant which fixes the position of the tracking beam and modulates the push location to effectively cancel out the effects of speckle-induced bias. We present here a three-dimensional STL-SWEI system which provides full suppression of lateral and elevation speckle bias for high resolution volumetric elasticity imaging, and requires no spatial smoothing to make accurate measurements of shear wave speed...
September 6, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28878825/rna-sequence-data-normalization-through-in-silico-prediction-of-reference-genes-the-bacterial-response-to-dna-damage-as-case-study
#18
Bork A Berghoff, Torgny Karlsson, Thomas Källman, E Gerhart H Wagner, Manfred G Grabherr
BACKGROUND: Measuring how gene expression changes in the course of an experiment assesses how an organism responds on a molecular level. Sequencing of RNA molecules, and their subsequent quantification, aims to assess global gene expression changes on the RNA level (transcriptome). While advances in high-throughput RNA-sequencing (RNA-seq) technologies allow for inexpensive data generation, accurate post-processing and normalization across samples is required to eliminate any systematic noise introduced by the biochemical and/or technical processes...
2017: BioData Mining
https://www.readbyqxmd.com/read/28869426/eeg-adaptive-noise-cancellation-using-information-theoretic-approach
#19
Ali Darroudi, Jaber Parchami, Morteza Kafaee Razavi, Ghazaleh Sarbisheie
OBJECTIVE: In this paper, an adaptive method based on error entropy criterion is presented in order to eliminate noise from Electroencephalogram (EEG) signals. METHOD: Conventionally, the Mean-Squared Error (MSE) criterion is the dominant criterion deployed in the adaptive filters for this purpose. By deploying MSE, only second-order moment of the error distribution is optimized, which is not adequate for the noisy EEG signal in which the contaminating noises are typically non-Gaussian...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28827785/a-highly-sensitive-plasma-based-amyloid-%C3%AE-detection-system-through-medium-changing-and-noise-cancellation-system-for-early-diagnosis-of-the-alzheimer-s-disease
#20
Yong Kyoung Yoo, Jinsik Kim, Gangeun Kim, Young Soo Kim, Hye Yun Kim, Sejin Lee, Won Woo Cho, Seongsoo Kim, Sang-Myung Lee, Byung Chul Lee, Jeong Hoon Lee, Kyo Seon Hwang
We developed an interdigitated microelectrode (IME) sensor system for blood-based Alzheimer's disease (AD) diagnosis based on impedimetric detection of amyloid-β (Aβ) protein, which is a representative candidate biomarker for AD. The IME sensing device was fabricated using a surface micromachining process. For highly sensitive detection of several tens to hundreds of picogram/mL of Aβ in blood, medium change from plasma to PBS buffer was utilized with signal cancellation and amplification processing (SCAP) system...
August 21, 2017: Scientific Reports
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