keyword
MENU ▼
Read by QxMD icon Read
search

Hardware

keyword
https://www.readbyqxmd.com/read/29227406/unexpected-blooming-artifact-in-brain-magnetic-resonance-imaging
#1
Akilesh Ramasamy, Balasubramanian Madhan, Balasubramanian Krishnan
Unexpected foreign bodies are occasionally discovered during magnetic resonance imaging (MRI). These are often present unknown to the patient, missed during routine pre-MRI screening and result in unnecessary delay during MRI. The authors present a patient with traumatically embedded foreign body in the scalp that escaped pre-MRI screening and caused susceptibility artifacts during brain MRI. The object was surgically removed to allow the imaging to be completed. Patients with suspicion or history of facial trauma or with dental restorations are referred to concerned specialists for compatibility of hardware, restorations and for assessing risks during MRI due to these...
December 7, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29225924/ct-dental-artifact-comparison-of-an-iterative-metal-artifact-reduction-technique-with-weighted-filtered-back-projection
#2
Felix E Diehn, Gregory J Michalak, David R DeLone, Amy L Kotsenas, E Paul Lindell, Norbert G Campeau, Ahmed F Halaweish, Cynthia H McCollough, Joel G Fletcher
Background: Dental hardware produces streak artifacts on computed tomography (CT) images reconstructed with the standard weighted filtered back projection (wFBP) method. Purpose: To perform a preliminary evaluation of an iterative metal artifact reduction (IMAR) technique to assess its ability to improve anatomic visualization over wFBP in patients with dental amalgam or other hardware. Material and Methods: CT images from patients with dental hardware were reconstructed using wFBP and IMAR software and soft-tissue or bone window/level settings...
November 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/29225511/the-crystalline-sponge-method-a-solvent-based-strategy-to-facilitate-noncovalent-ordered-trapping-of-solid-and-liquid-organic-compounds
#3
Timothy R Ramadhar, Shao-Liang Zheng, Yu-Sheng Chen, Jon Clardy
A strategy that leverages solvent effects to noncovalently trap solid and unstable liquid organic compounds within a crystalline sponge ({[(ZnI2)3(tris(4-pyridyl)-1,3,5-triazine)2]·x(CHCl3)}n) in a simple, mild, and efficient fashion for target molecule structure determination via X-ray diffraction is disclosed. Host-guest structures were obtained using third-generation synchrotron radiation, and new beamline hardware allowed rapid data collection in ~5-24 minutes. This is 40-90% faster than previously reported crystalline sponge synchrotron datasets collected by us, and approximately a 150-720-fold decrease in time versus using a typical in-house diffractometer, effectively enabling the potential for high-throughput analysis...
August 21, 2017: CrystEngComm
https://www.readbyqxmd.com/read/29225329/medial-patellofemoral-ligament-reconstruction-with-semi-patellar-tunnel-fixation-surgical-technique-and-mid-term-follow-up
#4
Jinghui Niu, Qi Qi, Kunpeng Fu, Guman Duan, Chang Liu, Fei Wang
BACKGROUND The present study aimed to describe a new safe and economical technique for medial patellofemoral ligament (MPFL) reconstruction with satisfactory clinical outcomes, and present the results of a four-year follow-up. MATERIAL AND METHODS Thirty-two patients with recurrent patella dislocation, who underwent MPFL reconstruction with two semi-patellar tunnels and hardware-free patellar fixation between 2011 and 2013, were included in the study. Patella stability was tested by an apprehension test preoperatively and at follow-up...
December 11, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29223594/femoral-neck-fractures-after-removal-of-hardware-in-healed-trochanteric-fractures
#5
REVIEW
Antonio Barquet, Peter V Giannoudis, Andrés Gelink
INTRODUCTION: Hardware removal in healed trochanteric fractures (TF) in the absence of infection or significant mechanical complications is rarely indicated. However, in patients with persistent pain, prominent material and discomfort in the activities of daily living, the implant is eventually removed. Publications of ipsilateral femoral neck fracture after removal of implants from healed trochanteric fractures (FNFARIHTF) just because of pain or discomfort are rare. The purpose of this systematic review of the literature is to report on the eventual risk factors, the mechanisms, the clinical presentation, and frequency, and to pay special emphasis in their prevention...
December 2017: Injury
https://www.readbyqxmd.com/read/29222728/fetal-electrocardiogram-extraction-and-analysis-using-adaptive-noise-cancellation-and-wavelet-transformation-techniques
#6
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/29221107/interferometric-synthetic-aperture-microscopy-for-extended-focus-optical-coherence-microscopy
#7
Séverine Coquoz, Arno Bouwens, Paul J Marchand, Jérôme Extermann, Theo Lasser
Optical coherence microscopy (OCM) is an interferometric technique providing 3D images of biological samples with micrometric resolution and penetration depth of several hundreds of micrometers. OCM differs from optical coherence tomography (OCT) in that it uses a high numerical aperture (NA) objective to achieve high lateral resolution. However, the high NA also reduces the depth-of-field (DOF), scaling with 1/NA2. Interferometric synthetic aperture microscopy (ISAM) is a computed imaging technique providing a solution to this trade-off between resolution and DOF...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29220305/spiking-neural-classifier-with-lumped-dendritic-nonlinearity-and-binary-synapses-a-current-mode-vlsi-implementation-and-analysis
#8
Aritra Bhaduri, Amitava Banerjee, Subhrajit Roy, Sougata Kar, Arindam Basu
We present a neuromorphic current mode implementation of a spiking neural classifier with lumped square law dendritic nonlinearity. It has been shown previously in software simulations that such a system with binary synapses can be trained with structural plasticity algorithms to achieve comparable classification accuracy with fewer synaptic resources than conventional algorithms. We show that even in real analog systems with manufacturing imperfections (CV of 23.5% and 14.4% for dendritic branch gains and leaks respectively), this network is able to produce comparable results with fewer synaptic resources...
December 8, 2017: Neural Computation
https://www.readbyqxmd.com/read/29219219/ultrahigh-magnitude-brain-magnetic-resonance-imaging-scan-on-rhesus-monkeys-with-implanted-deep-brain-stimulation-hardware
#9
Jun-Ju Li, Lin Shi, Ying-Chuan Chen, Guan-Yu Zhu, Jian-Guo Zhang
BACKGROUND: Patients with implanted deep brain stimulation (DBS) hardware are prohibited from undergoing magnetic resonance imaging (MRI) scans at magnitudes greater than 1.5 T to avoid potential MRI-related heating injury. Whether DBS devices are compatible with higher field MRI scanning is unknown. This study aimed to investigate whether 7.0 T and 3.0 T MRI scans can be safely performed on rhesus monkeys with implanted DBS devices. METHODS: Eight male rhesus monkeys were included in this study and stereotactically implanted with DBS devices in the left anterior thalamus...
December 8, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29219118/adaptive-quantization-of-local-field-potentials-for-wireless-implants-in-freely-moving-animals-an-open-source-neural-recording-device
#10
Dominique Martinez, Maxime Clement, Belkacem Messaoudi, Damien Gervasoni, Philippe Litaudon, Nathalie Buonviso
OBJECTIVE: Modern neuroscience research asks for electrophysiological recording of local field potentials (LFPs) in moving animals. Wireless transmission has the advantage of removing the wires between the animal and the recording equipment but is hampered by the large amount of data to be sent at a relatively high rate. APPROACH: To reduce transmission bandwidth, we propose an encoder/decoder scheme based on adaptive non-uniform quantization. Our algorithm uses the current transmitted codeword to adapt the quantization intervals to changing statistics in LFP signals...
December 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29219098/analyzing-implementation-dynamics-using-theory-driven-evaluation-principles-lessons-learnt-from-a-south-african-centralized-chronic-dispensing-model
#11
Bvudzai Priscilla Magadzire, Bruno Marchal, Tania Mathys, Richard O Laing, Kim Ward
BACKGROUND: Centralized dispensing of essential medicines is one of South Africa's strategies to address the shortage of pharmacists, reduce patients' waiting times and reduce over-crowding at public sector healthcare facilities. This article reports findings of an evaluation of the Chronic Dispensing Unit (CDU) in one province. The objectives of this process evaluation were to: (1) compare what was planned versus the actual implementation and (2) establish the causal elements and contextual factors influencing implementation...
December 4, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/29216098/planar-self-calibration-for-stereo-cameras-with-radial-distortion
#12
Banglei Guan, Yang Shang, Qifeng Yu
In this paper, we present a robust technique of stereo calibration using homography constraints. Our method is novel as stereo calibration is performed by solving a polynomial equation system including two radial distortion parameters, using a minimal number of five image point correspondences. This enables us to calibrate from only a pair of stereo images of a planar scene, and to provide the exact algebraic solution to the stereo calibration problem. The minimal case solution is useful to reduce the computation time and increase the calibration robustness when using random sample consensus (RANSAC) from the correspondences of the stereo image pair...
November 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29215150/mri-monitoring-of-focused-ultrasound-sonications-near-metallic-hardware
#13
Hans Weber, Pejman Ghanouni, Aurea Pascal-Tenorio, Kim Butts Pauly, Brian A Hargreaves
PURPOSE: To explore the temperature-induced signal change in two-dimensional multi-spectral imaging (2DMSI) for fast thermometry near metallic hardware to enable MR-guided focused ultrasound surgery (MRgFUS) in patients with implanted metallic hardware. METHOD: 2DMSI was optimized for temperature sensitivity and applied to monitor focus ultrasound surgery (FUS) sonications near metallic hardware in phantoms and ex vivo porcine muscle tissue. Further, we evaluated its temperature sensitivity for in vivo muscle in patients without metallic hardware...
December 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29214799/advanced-multiwavelength-detection-in-analytical-ultracentrifugation
#14
Joseph Pearson, Johannes Walter, Wolfgang Peukert, Helmut Cölfen
This work highlights significant advancements in detector hardware and software for multiwavelength analytical ultracentrifugation (MWL-AUC) experiments, demonstrating improvement in both, the spectral performance and UV capabilities of the instrument. The hardware is an extension of the Open AUC MWL detector developed in academia and first introduced in 2006 by Bhattacharya et al. Additional modifications as well as new analytical methods available for MWL data have since been reported. The present work describes new and continuing improvements to the MWL detector, including mirror source and imaging optics, UV sensitive acquisition modes and revised data acquisition software...
December 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29214631/system-matrix-computation-vs-storage-on-gpu-a-comparative-study-in-cone-beam-ct
#15
Dmitri Matenine, Geoffroi Côté, Julia Mascolo-Fortin, Yves Goussard, Philippe Després
PURPOSE: Iterative reconstruction algorithms in computed tomography (CT) require a fast method for computing the intersection distances between the trajectories of photons and the object, also called ray-tracing or system matrix computation. This work focused on the thin-ray model and is aimed at comparing different system matrix handling strategies using graphical processing units (GPUs). METHODS: In this work, the system matrix is modeled by thin rays intersecting a regular grid of box-shaped voxels, known to be an accurate representation of the forward projection operator in CT...
December 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/29211758/rubus-a-compiler-for-seamless-and-extensible-parallelism
#16
Muhammad Adnan, Faisal Aslam, Zubair Nawaz, Syed Mansoor Sarwar
Nowadays, a typical processor may have multiple processing cores on a single chip. Furthermore, a special purpose processing unit called Graphic Processing Unit (GPU), originally designed for 2D/3D games, is now available for general purpose use in computers and mobile devices. However, the traditional programming languages which were designed to work with machines having single core CPUs, cannot utilize the parallelism available on multi-core processors efficiently. Therefore, to exploit the extraordinary processing power of multi-core processors, researchers are working on new tools and techniques to facilitate parallel programming...
2017: PloS One
https://www.readbyqxmd.com/read/29211018/parameter-search-algorithms-for-microwave-radar-based-breast-imaging-focal-quality-metrics-as-fitness-functions
#17
Declan O'Loughlin, Bárbara L Oliveira, Muhammad Adnan Elahi, Martin Glavin, Edward Jones, Milica Popović, Martin O'Halloran
Inaccurate estimation of average dielectric properties can have a tangible impact on microwave radar-based breast images. Despite this, recent patient imaging studies have used a fixed estimate although this is known to vary from patient to patient. Parameter search algorithms are a promising technique for estimating the average dielectric properties from the reconstructed microwave images themselves without additional hardware. In this work, qualities of accurately reconstructed images are identified from point spread functions...
December 6, 2017: Sensors
https://www.readbyqxmd.com/read/29211004/a-skylight-simulator-for-hwil-simulation-of-hyperspectral-remote-sensing
#18
Huijie Zhao, Bolun Cui, Guorui Jia, Xudong Li, Chao Zhang, Xinyang Zhang
Even though digital simulation technology has been widely used in the last two decades, hardware-in-the-loop (HWIL) simulation is still an indispensable method for spectral uncertainty research of ground targets. However, previous facilities mainly focus on the simulation of panchromatic imaging. Therefore, neither the spectral nor the spatial performance is enough for hyperspectral simulation. To improve the accuracy of illumination simulation, a new dome-like skylight simulator is designed and developed to fit the spatial distribution and spectral characteristics of a real skylight for the wavelength from 350 nm to 2500 nm...
December 6, 2017: Sensors
https://www.readbyqxmd.com/read/29208976/dynamical-system-with-plastic-self-organized-velocity-field-as-an-alternative-conceptual-model-of-a-cognitive-system
#19
Natalia B Janson, Christopher J Marsden
It is well known that architecturally the brain is a neural network, i.e. a collection of many relatively simple units coupled flexibly. However, it has been unclear how the possession of this architecture enables higher-level cognitive functions, which are unique to the brain. Here, we consider the brain from the viewpoint of dynamical systems theory and hypothesize that the unique feature of the brain, the self-organized plasticity of its architecture, could represent the means of enabling the self-organized plasticity of its velocity vector field...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29206327/pharyngeal-perforation-after-anterior-cervical-spine-surgery-treated-by-transoral-endoscopic-surgery
#20
Julio Rama-López, Meritxell Tomás-Fernandez, César García-Garza, Milton Martínez-Madrigal
BACKGROUND: Anterior cervical fixation has been used since 1967 for multiple pathologies like traumatism, compressive myelopathy, or spinal infections. METHODS: We report the case of a patient who had undergone cervical spine surgery 10 years previously and presented to our clinic with a pharyngeal fistula due to surgical screw displacement that was treated by transoral endoscopic surgery. RESULTS: The immediate postoperative period occurred without incidence and complete odynophagia resolution...
December 5, 2017: Head & Neck
keyword
keyword
72904
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"