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https://www.readbyqxmd.com/read/28227984/preliminary-study-on-the-automated-skull-fracture-detection-in-ct-images-using-black-hat-transform
#1
Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita, Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita, Tomoko Otsuka, Hiroshi Fujita, Ayumi Yamada, Kohei Kudo, Hirofumi Anno, Atsushi Teramoto
Linear skull fracture, following head trauma, may reach major blood vessels, such as the middle meningeal artery or sinus venosus, and may cause epidural hematoma. However, hematoma is likely to be missed in the initial interpretation because it spreads only gradually. In addition, the fracture lines that run along the scan slice plane are often missed during initial interpretation. In this study, we develop a novel method for automated detection of the linear skull fracture using head computed tomography (CT) images and conduct a basic evaluation using digital phantom and head phantom that enclose genuine human bones...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227813/a-110-nw-in-channel-sigma-delta-converter-for-large-scale-neural-recording-implants
#2
M Rezaei, E Maghsoudloo, M Sawan, B Gosselin, M Rezaei, E Maghsoudloo, M Sawan, B Gosselin, M Rezaei, E Maghsoudloo, M Sawan, B Gosselin
Advancement in wireless and microsystems technology have ushered in new devices that can directly interface with the central nervous system for stimulating and/or monitoring neural circuitry. In this paper, we present an ultra low-power sigma-delta analog-to-digital converter (ADC) intended for utilization into large-scale multi-channel neural recording implants. This proposed design, which provides a resolution of 9 bits using a one-bit oversampled ADC, presents several desirable features that allow for an in-channel ADC scheme, where one sigma-delta converter is provided for each channel, enabling development of scalable systems that can interface with different types of high-density neural microprobes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227807/ecog-data-analyses-to-inform-closed-loop-bci-experiments-for-speech-based-prosthetic-applications
#3
Tejaswy Pailla, Werner Jiang, Benjamin Dichter, Edward F Chang, Vikash Gilja, Tejaswy Pailla, Werner Jiang, Benjamin Dichter, Edward F Chang, Vikash Gilja, Vikash Gilja, Werner Jiang, Tejaswy Pailla, Benjamin Dichter, Edward F Chang
Brain Computer Interfaces (BCIs) assist individuals with motor disabilities by enabling them to control prosthetic devices with their neural activity. Performance of closed-loop BCI systems can be improved by using design strategies that leverage structured and task-relevant neural activity. We use data from high density electrocorticography (ECoG) grids implanted in three subjects to study sensory-motor activity during an instructed speech task in which the subjects vocalized three cardinal vowel phonemes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227515/a-clinic-compatible-open-source-electrophysiology-system
#4
John Hermiz, Nick Rogers, Erik Kaestner, Mehran Ganji, Dan Cleary, Joseph Snider, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja, John Hermiz, Nick Rogers, Erik Kaestner, Mehran Ganji, Dan Cleary, Joseph Snider, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja, Erik Kaestner, Mehran Ganji, David Barba, Joseph Snider, Nick Rogers, Shadi Dayeh, Eric Halgren, Vikash Gilja, Dan Cleary, John Hermiz
Open source electrophysiology (ephys) recording systems have several advantages over commercial systems such as customization and affordability enabling more researchers to conduct ephys experiments. Notable open source ephys systems include Open-Ephys, NeuroRighter and more recently Willow, all of which have high channel count (64+), scalability, and advanced software to develop on top of. However, little work has been done to build an open source ephys system that is clinic compatible, particularly in the operating room where acute human electrocorticography (ECoG) research is performed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227332/using-surface-electromyography-to-detect-changes-in-innervation-zones-pattern-after-human-cervical-spinal-cord-injury
#5
Babak Afsharipour, Milap S Sandhu, Ghulam Rasool, Nina L Suresh, William Z Rymer, Babak Afsharipour, Milap S Sandhu, Ghulam Rasool, Nina L Suresh, William Z Rymer, Milap S Sandhu, Babak Afsharipour, William Z Rymer, Nina L Suresh, Ghulam Rasool
Human spinal cord injuries (SCI) disrupt the pathways between brain and spinal cord, resulting in substantial impairment and loss of function. Currently, we do not have the ability to precisely quantify the "functional" level of motor injury. The aim of this study is to determine if high-density surface electromyography imaging (SEI) can be used to characterize the location and extent of the spinal lesion. SEI is a safe and non-invasive technique, which uses several electrodes to provide a map of muscle activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227307/estimating-the-progression-of-muscle-fatigue-based-on-dependence-between-motor-units-using-high-density-surface-electromyogram
#6
Adrian Bingham, Sridhar P Arjunan, Dinesh K Kumar, Adrian Bingham, Sridhar P Arjunan, Dinesh K Kumar, Adrian Bingham, Dinesh K Kumar, Sridhar P Arjunan
In this study we have tested the hypothesis regarding the increase in synchronization with the onset of muscle fatigue. For this aim, we have investigated the difference in the synchronicity between high density surface electromyogram (sEMG) channels of the rested muscles and when at the limit of endurance. Synchronization was measured by computing and normalizing the mutual information between the sEMG signals recorded from the high-density array electrode locations. Ten volunteers (Age range: 21 and 35 years; Mean age = 26 years; Male = 6, Female = 4) participated in our experiment...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227101/high-density-penetrating-electrode-arrays-for-autonomic-nerves
#7
John Burns, Yee-Hsee Hsieh, Andrew Mueller, Juliette Chevallier, T S Sriram, Stephen J Lewis, Daniel Chew, Anil Achyuta, Jason Fiering, John Burns, Yee-Hsee Hsieh, Andrew Mueller, Juliette Chevallier, T S Sriram, Stephen J Lewis, Daniel Chew, Anil Achyuta, Jason Fiering, Daniel Chew, Yee-Hsee Hsieh, Andrew Mueller, Jason Fiering, T S Sriram, Juliette Chevallier, Stephen J Lewis, Anil Achyuta
Electrode arrays for recording and stimulation in the central nervous system have enabled numerous advances in basic science and therapeutic strategies. In particular, micro-fabricated arrays with precision size and spacing offer the benefit of accessing single neurons and permit mapping of neuronal function. Similar advances are envisioned toward understanding the autonomic nervous system and developing therapies based on its modulation, but appropriate electrode arrays are lacking. Here, we present for the first time, a multi-channel electrode array suitable for penetration of peripheral nerves having diameters as small as 0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226998/extraction-of-the-brachialis-muscle-activity-using-hd-semg-technique-and-canonical-correlation-analysis
#8
M Al Harrach, B Afsharipour, S Boudaoud, V Carriou, F Marin, R Merletti, M Al Harrach, B Afsharipour, S Boudaoud, V Carriou, F Marin, R Merletti, V Carriou, B Afsharipour, M Al Harrach, F Marin, S Boudaoud
The Brachialis (BR) is placed under the Biceps Brachii (BB) deep in the upper arm. Therefore, the detection of the corresponding surface Electromyogram (sEMG) is a complex task. The BR is an important elbow flexor, but it is usually not considered in the sEMG based force estimation process. The aim of this study was to attempt to separate the two sEMG activities of the BR and the BB by using a High Density sEMG (HD-sEMG) grid placed at the upper arm and Canonical Component Analysis (CCA) technique. For this purpose, we recorded sEMG signals from seven subjects with two 8 × 4 electrode grids placed over BB and BR...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226866/fully-implantable-multi-channel-microstimulator-with-tracking-supply-ribbon-and-energy-recovery
#9
Amin Rashidi, Niloofar Yazdani, Amir M Sodagar, Amin Rashidi, Niloofar Yazdani, Amir M Sodagar, Amir M Sodagar, Amin Rashidi, Niloofar Yazdani
This paper proposes a novel energy-efficient approach dedicated to high-density implantable stimulators such as visual prostheses. Energy efficiency of the approach proposed in this work is achieved through two ideas: the `tracking supply ribbon' technique, and `reverse charge pumping'. The proposed approach is implemented, in the multichannel case, in such a way that power efficiency of each stimulation channel is enhanced according to its specific voltage/current condition and independently from other channels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226854/a-distributed-current-stimulator-asic-for-high-density-neural-stimulation
#10
Jeong Hoan Park, Chaebin Kim, Seung-Hee Ahn, Tae Mok Gwon, Joonsoo Jeong, Sang Beom Jun, Sung June Kim, Jeong Hoan Park, Chaebin Kim, Seung-Hee Ahn, Tae Mok Gwon, Joonsoo Jeong, Sang Beom Jun, Sung June Kim, Sung June Kim, Joonsoo Jeong, Sang Beom Jun, Tae Mok Gwon, Chaebin Kim, Seung-Hee Ahn, Jeong Hoan Park
This paper presents a novel distributed neural stimulator scheme. Instead of a single stimulator ASIC in the package, multiple ASICs are embedded at each electrode site for stimulation with a high density electrode array. This distributed architecture enables the simplification of wiring between electrodes and stimulator ASIC that otherwise could become too complex as the number of electrode increases. The individual ASIC chip is designed to have a shared data bus that independently controls multiple stimulating channels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226838/realistic-motor-unit-placement-in-a-cylindrical-hd-semg-generation-model
#11
Vincent Carriou, Jeremy Laforet, Sofiane Boudaoud, Mariam Al Harrach, Vincent Carriou, Jeremy Laforet, Sofiane Boudaoud, Mariam Al Harrach, Jeremy Laforet, Sofiane Boudaoud, Vincent Carriou, Mariam Al Harrach
The aim of this work is to assess an automatic optimized algorithm for the positioning of the Motor Units (MUs) within a multilayered cylindrical High Density surface EMG (HD-sEMG) generation model representing a skeletal muscle. The multilayered cylinder is composed of three layers: muscle, adipose and skin tissues. For this purpose, two different algorithms will be compared: an unconstrained random and a Mitchell's Best Candidate (MBC) placements, both with uniform distribution for the MUs positions. These algorithms will then be compared by their fiber density within the muscle and by using a classical amplitude descriptor, the Root-Mean-Square (RMS) amplitude value obtained from 64 HD-sEMG signals recorded by an 8×8 electrode grid of circular electrode during one contraction at 70% Maximum Voluntary Contraction (MVC) in both simulation and experimental conditions for the Biceps Brachii (BB) muscle...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226837/a-preliminary-evaluation-of-myoelectrical-energy-distribution-of-the-front-neck-muscles-in-pharyngeal-phase-during-normal-swallowing
#12
Mingxing Zhu, Wanzhang Yang, Oluwarotimi Williams Samuel, Yun Xiang, Jianping Huang, Haiqing Zou, Guanglin Li, Mingxing Zhu, Wanzhang Yang, Oluwarotimi Williams Samuel, Yun Xiang, Jianping Huang, Haiqing Zou, Guanglin Li, Wanzhang Yang, Yun Xiang, Guanglin Li, Haiqing Zou, Jianping Huang, Oluwarotimi Williams Samuel, Mingxing Zhu
Pharyngeal phase is a central hub of swallowing in which food bolus pass through from the oral cavity to the esophageal. Proper understanding of the muscular activities in the pharyngeal phase is useful for assessing swallowing function and the occurrence of dysphagia in humans. In this study, high-density (HD) surface electromyography (sEMG) was used to study the muscular activities in the pharyngeal phase during swallowing tasks involving three healthy male subjects. The root mean square (RMS) of the HD sEMG data was computed by using a series of segmented windows as myoelectrical energy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226797/thin-film-high-density-micro-electrocorticographic-decoding-of-a-human-cortical-gyrus
#13
Leah Muller, Sarah Felix, Kedar G Shah, Kye Lee, Satinderpall Pannu, Edward F Chang, Leah Muller, Sarah Felix, Kedar G Shah, Kye Lee, Satinderpall Pannu, Edward F Chang, Satinderpall Pannu, Sarah Felix, Leah Muller, Kedar G Shah, Kye Lee, Edward F Chang
High-density electrocorticography (ECoG) arrays are promising interfaces for high-resolution neural recording from the cortical surface. Commercial options for high-density arrays are limited, and historically tradeoffs must be made between spatial coverage and electrode density. However, thin-film technology is a promising alternative for generating electrode arrays capable of large area coverage and high channel count, with resolution on the order of cortical columns in the functional surface unit of a human gyrus...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226664/channel-interpolation-in-tms-eeg-a-quantitative-study-towards-an-accurate-topographical-representation
#14
S Petrichella, L Vollere, F Ferreri, A Guerra, S Maatta, M Kononen, V Di Lazzaro, G Iannello, S Petrichella, L Vollere, F Ferreri, A Guerra, S Maatta, M Kononen, V Di Lazzaro, G Iannello, S Petrichella, M Kononen, G Iannello, A Guerra, S Maatta, V Di Lazzaro, F Ferreri
The co-registration of transcranial magnetic stimulation and electroencephalography (TMS-EEG) is emerging as a successful technique for causally exploring cortical mechanisms and connections. However, various artefacts could affect TMS-EEG signals. Correct artefacted channels reconstruction is crucial to obtain accurate topographical representation and consequently accurate inverse problem solution, in order to map in a proper way the global brain responses after the stimulation of one particular brain region of interest...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226506/properties-of-the-motor-unit-action-potential-shape-in-proximal-and-distal-muscles-of-the-upper-limb-in-healthy-and-post-stroke-individuals
#15
Laura Miller McPherson, Francesco Negro, Chris K Thompson, Laura Sanchez, C J Heckman, Jules Dewald, Dario Farina, Laura Miller McPherson, Francesco Negro, Chris K Thompson, Laura Sanchez, C J Heckman, Jules Dewald, Dario Farina, Chris K Thompson, Laura Miller McPherson, Laura Sanchez, Cj Heckman, Jules Dewald, Dario Farina, Francesco Negro
Spectral analysis of surface electromyograms (sEMG) is often used to estimate central and peripheral characteristics of a motor unit (MU) population, such as average conduction velocity, proportion of muscle fiber types, and pattern of MU recruitment. This estimation is based on the assumption that the sEMG adequately reflects the frequency characteristics of the underlying MU action potentials (MUAP). However, sEMG has limitations in this respect, based on physiological and non-physiological factors that influence its frequency content...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226453/spatial-characterization-of-innervation-zones-under-electrically-elicited-m-wave
#16
C Zhang, Y Peng, S Li, P Zhou, A Munoz, D Tang, Y Zhang, C Zhang, Y Peng, S Li, P Zhou, A Munoz, D Tang, Y Zhang, C Zhang, P Zhou, D Tang, Y Zhang, S Li, A Munoz, Y Peng
The three dimensional (3D) innervation zone (IZ) imaging approach (3DIZI) has been developed in our group to localize the IZ of a particular motor unit (MU) from its motor unit action potentials decomposed from high-density surface electromyography (EMG) recordings. In this study, the developed 3DIZI approach was combined with electrical stimulation to investigate global distributions of IZs in muscles from electrically elicited M-wave recordings. Electrical stimulations were applied to the musculocutaneous nerve to activate supramaximal muscle response of the biceps brachii in one healthy subject, and high-density (128 channels) surface EMG signals of the biceps brachii muscles were recorded...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226452/high-resolution-eeg-source-imaging-of-one-year-old-children
#17
Zeynep Akalin Acar, Silvia Ortiz-Mantilla, April Benasich, Scott Makeig, Zeynep Akalin Acar, Silvia Ortiz-Mantilla, April Benasich, Scott Makeig, April Benasich, Scott Makeig, Zeynep Akalin Acar, Silvia Ortiz-Mantilla
Recently we described an iterative skull conductivity and source location estimation (SCALE) algorithm for simultaneously estimating head tissue conductivities and brain source locations. SCALE uses a realistic FEM forward problem head model and scalp maps of 10 or more near-dipolar sources identified by independent component analysis (ICA) decomposition of sufficient high-density EEG data. In this study, we applied SCALE to 20 minutes of 64-channel EEG data and magnetic resonance (MR) head images from four twelve-months-of-age infants...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226439/optical-imaging-of-functional-connectivity-at-the-bedside
#18
Joseph P Culver, Karla M Bergonzi, Adam E Eggebrecht, Andrew K Fishell, Jin-Moo Lee, Joseph P Culver, Karla M Bergonzi, Adam E Eggebrecht, Andrew K Fishell, Jin-Moo Lee, Andrew K Fishell, Joseph P Culver, Jin-Moo Lee, Karla M Bergonzi, Adam E Eggebrecht
High-density imaging arrays have improved the image quality of diffuse optical tomography (HD-DOT) methods for mapping brain functions. Development of resting state measures of functional connectivity provides a brain assay logistically compatible with bedside imaging in the clinic. In this paper we review these advances and demonstrate the sensitivity of HD-DOT to acute ischemic stroke.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226299/colorimetric-and-electrophoretic-evaluation-of-lipoprotein-fractions-in-healthy-neonatal-calves-comparison-with-results-from-adult-cows-and-from-calves-with-inflammatory-conditions
#19
Alessia Giordano, Gabriele Rossi, Monica Probo, Pierangelo Moretti, Saverio Paltrinieri
High density lipoproteins (HDLs) are pivotal in innate immunity and decrease in serum during inflammation. Several studies have been done about lipoprotein changes in transition cows but little is known about their changes in newborn calves. The aim of this study is to provide information about HDLs in newborn calves, by defining the possible age-related changes in healthy calves compared with adults and by assessing the possible differences in calves with inflammation. Lipoprotein electrophoretic separation (reported as percentages) and colorimetric measurement of HDL (HDL-C) were performed on healthy cows and calves in order to identify possible differences in the lipoprotein profile due to the age...
February 13, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28226289/impact-of-volume-conducted-potential-in-interpretation-of-cortico-cortical-evoked-potential-detailed-analysis-of-high-resolution-electrocorticography-using-two-mathematical-approaches
#20
Seijiro Shimada, Naoto Kunii, Kensuke Kawai, Takeshi Matsuo, Yohei Ishishita, Kenji Ibayashi, Nobuhito Saito
OBJECTIVE: Cortico-cortical evoked potential (CCEP) has been utilized to evaluate connectivity between cortices. However, previous reports have rarely referred to the impact of volume-conducted potential (VCP) which must be a confounding factor of large potential around the stimulation site. To address this issue, we challenged the null hypothesis that VCP accounts for the majority of the recorded potential, particularly around the stimulation site. METHODS: CCEP was recorded with high-density intracranial electrodes in 8 patients with intractable epilepsy...
January 30, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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