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https://www.readbyqxmd.com/read/29389985/multiband-multi-echo-simultaneous-asl-bold-for-task-induced-functional-mri
#1
Alexander D Cohen, Andrew S Nencka, Yang Wang
Typical simultaneous blood oxygenation-level dependent (BOLD) and arterial spin labeling (ASL) sequences acquire two echoes, one perfusion-sensitive and one BOLD-sensitive. However, for ASL, spatial resolution and brain coverage are limited due to the T1 decay of the labeled blood. This study applies a sequence combining a multiband acquisition with four echoes for simultaneous BOLD and pseudo-continuous ASL (pCASL) echo planar imaging (MBME ASL/BOLD) for block-design task-fMRI. A multiband acceleration of four was employed to increase brain coverage and reduce slice-timing effects on the ASL signal...
2018: PloS One
https://www.readbyqxmd.com/read/29367616/single-plasmonic-structure-enhanced-dual-band-room-temperature-infrared-photodetection
#2
Jinchao Tong, Landobasa Y M Tobing, Yu Luo, Dawei Zhang, Dao Hua Zhang
Dual-band photodetection in mid- and near-wave infrared spectral bands is of scientific interest and technological importance. Most of the state-of-the-art mid-infrared photodetectors normally operate at low temperature and/or suffer from toxicity and high cost due to limitations of material properties and device structures. The capability of surface plasmons in confining electromagnetic waves into extremely small volume provides an opportunity for improving the performance for room temperature operation. Here, we report an n-InAsSb/n-GaSb heterostructure photodiode integrated with plasmonic two-dimensional subwavelength hole array (2DSHA) for room temperature two band photodetection...
January 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29357371/evaluating-the-impact-of-fast-fmri-on-dynamic-functional-connectivity-in-an-event-based-paradigm
#3
Ashish Kaul Sahib, Michael Erb, Justus Marquetand, Pascal Martin, Adham Elshahabi, Silke Klamer, Serge Vulliemoz, Klaus Scheffler, Thomas Ethofer, Niels K Focke
The human brain is known to contain several functional networks that interact dynamically. Therefore, it is desirable to analyze the temporal features of these networks by dynamic functional connectivity (dFC). A sliding window approach was used in an event-related fMRI (visual stimulation using checkerboards) to assess the impact of repetition time (TR) and window size on the temporal features of BOLD dFC. In addition, we also examined the spatial distribution of dFC and tested the feasibility of this approach for the analysis of interictal epileptiforme discharges...
2018: PloS One
https://www.readbyqxmd.com/read/29334223/a-novel-color-modulation-analysis-strategy-through-tunable-multiband-laser-for-nanoparticle-identification-and-evaluation
#4
Xuan Cao, Gang Lei, Jingjing Feng, Qi Pan, Xiaodong Wen, Yan He
Creating color difference and improving the color resolution in digital imaging is crucial for better application of color analy-sis. Herein, a novel color modulation analysis strategy was developed by using a homemade tunable multiband laser illumi-nation device, in which the portions of R, G, and B components of the illumination light are discretionarily adjustable, and hence the sample color could be visually modulated continuously in the RGB color space. Through this strategy, the color appearance of single gold nanorods (AuNRs) under dark-field microscopy, was migrated from the spectrally insensitive red region to the spectrally sensitive green-yellow-red region...
January 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29331056/exploring-the-advantages-of-multiband-fmri-with-simultaneous-eeg-to-investigate-coupling-between-gamma-frequency-neural-activity-and-the-bold-response-in-humans
#5
Makoto Uji, Ross Wilson, Susan T Francis, Karen J Mullinger, Stephen D Mayhew
We established an optimal combination of EEG recording during sparse multiband (MB) fMRI that preserves high-resolution, whole-brain fMRI coverage while enabling broad-band EEG recordings which are uncorrupted by MRI gradient artefacts (GAs). We first determined the safety of simultaneous EEG recording during MB fMRI. Application of MB factor = 4 produced <1°C peak heating of electrode/hardware during 20 min of GE-EPI data acquisition. However, higher SAR sequences require specific safety testing, with greater heating observed using PCASL with MB factor = 4...
January 13, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29315932/multiband-diffusion-weighted-mri-of-the-eye-and-orbit-free-of-geometric-distortions-using-a-rare-epi-hybrid
#6
Katharina Paul, Till Huelnhagen, Eva Oberacker, Daniel Wenz, André Kuehne, Helmar Waiczies, Sebastian Schmitter, Oliver Stachs, Thoralf Niendorf
This study shows that diffusion-weighted rapid acquisition with relaxation enhancement-echo planar imaging (RARE-EPI) has the capability to acquire distortion-free images of the eye and orbit with ample diffusion contrast. The results underpin the challenges of ocular imaging at 3.0 T and 7.0 T for EPI and demonstrate that these issues can be offset using accelerated RARE-based approaches. This benefit can be exploited for the assessment of spatial arrangements of the eye segments and their masses with the goal to provide guidance in the diagnostic assessment and treatment of ophthalmological diseases...
January 9, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29303331/multicomponent-electron-hole-superfluidity-and-the-bcs-bec-crossover-in-double-bilayer-graphene
#7
S Conti, A Perali, F M Peeters, D Neilson
Superfluidity in coupled electron-hole sheets of bilayer graphene is predicted here to be multicomponent because of the conduction and valence bands. We investigate the superfluid crossover properties as functions of the tunable carrier densities and the tunable energy band gap E_{g}. For small band gaps there is a significant boost in the two superfluid gaps, but the interaction-driven excitations from the valence to the conduction band can weaken the superfluidity, even blocking the system from entering the Bose-Einstein condensate (BEC) regime at low densities...
December 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29279164/clinical-application-of-half-fourier-acquisition-single-shot-turbo-spin-echo-haste-imaging-accelerated-by-simultaneous-multi-slice-acquisition
#8
Jenni Schulz, José P Marques, Annemieke Ter Telgte, Anouk van Dorst, Frank-Erik de Leeuw, Frederick J A Meijer, David G Norris
As a single-shot sequence with a long train of refocusing pulses, Half-Fourier Acquisition Single-Shot Turbo-Spin-Echo (HASTE) suffers from high power deposition limiting use at high resolutions and high field strengths, particularly if combined with acceleration techniques such as simultaneous multi-slice (SMS) imaging. Using a combination of multiband (MB)-excitation and PINS-refocusing pulses will effectively accelerate the acquisition time while staying within the SAR limitations. In particular, uncooperative and young patients will profit from the speed of the MB-PINS HASTE sequence, as clinical diagnosis can be possible without sedation...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29241276/multiband-mucosectomy-for-the-treatment-of-challenging-non-pedunculated-colorectal-polyps
#9
Joaquín Rodríguez-Sánchez, Eva De la Santa Belda, Pilar Olivencia Palomar, Margarita Úbeda Muñoz, José Olmedo Camacho
Background and study aims Endoscopic mucosal resection is the gold standard treatment for non-pedunculated colorectal polyps; however, some specific situations (location behind folds, scarred or flat morphology) can make this technique challenging. We aimed to assess the efficacy and safety of multiband mucosectomy (MBM) for resection of non-pedunculated colorectal polyps. Patients and methods This was a retrospective study of patients in whom MBM was performed to resect large non-pedunculated colorectal polyps...
December 14, 2017: Endoscopy
https://www.readbyqxmd.com/read/29235190/intrinsic-functional-connectivity-of-the-central-extended-amygdala
#10
Rachael M Tillman, Melissa D Stockbridge, Brendon M Nacewicz, Salvatore Torrisi, Andrew S Fox, Jason F Smith, Alexander J Shackman
The central extended amygdala (EAc)-including the bed nucleus of the stria terminalis (BST) and central nucleus of the amygdala (Ce)-plays a critical role in triggering fear and anxiety and is implicated in the development of a range of debilitating neuropsychiatric disorders. Although it is widely believed that these disorders reflect the coordinated activity of distributed neural circuits, the functional architecture of the EAc network and the degree to which the BST and the Ce show distinct patterns of functional connectivity is unclear...
December 12, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29216079/theoretical-investigation-of-a-five-band-terahertz-absorber-based-on-an-asymmetric-split-ring-resonator
#11
Tianhua Meng, Dan Hu, Hongyan Wang, Xiwei Zhang, Zhenjie Tang
A simple five-band terahertz metamaterial perfect absorber, composed of an asymmetric double-gap square split ring and a metallic ground plate spaced by a thin polyimide dielectric layer, is proposed and theoretically investigated. The results show that it can perform absorption peaks at five resonant frequencies whose peaks average 98.85%. The perfect absorption is mainly attributed to the combined effect of LC, dipole, and surface response of the structure. Compared to previously reported multiband absorbers, our design only has a single and compact structure, which can drastically simplify the design and fabrication process...
December 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29211655/spectral-diversity-in-default-mode-network-connectivity-reflects-behavioral-state
#12
Michael M Craig, Anne E Manktelow, Barbara J Sahakian, David K Menon, Emmanuel A Stamatakis
Default mode network (DMN) functional connectivity is thought to occur primarily in low frequencies (<0.1 Hz), resulting in most studies removing high frequencies during data preprocessing. In contrast, subtractive task analyses include high frequencies, as these are thought to be task relevant. An emerging line of research explores resting fMRI data at higher-frequency bands, examining the possibility that functional connectivity is a multiband phenomenon. Furthermore, recent studies suggest DMN involvement in cognitive processing; however, without a systematic investigation of DMN connectivity during tasks, its functional contribution to cognition cannot be fully understood...
December 6, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29159277/development-of-a-porcine-model-for-assessment-of-mucosal-repair-following-endoscopic-resection-of-the-lower-gastrointestinal-tract
#13
Nicolas Etchepare, Jérémy Bregeon, Lucille Quénéhervé, Sami Haddara, Yann Touchefeu, Michel Neunlist, Emmanuel Coron
Background and aims:  Endoscopic mucosal resection (EMR) is widely performed for the treatment of colorectal polyps. However, the pathophysiological mechanisms of mucosal repair, including in situations at high risk of post-polypectomy bleeding, remain largely unknown. The objective of our study was to develop a porcine model of EMR in the lower gastrointestinal tract to monitor mucosal wound healing over time. Methods:  Under general anesthesia, five large wounds were created in the lower gastrointestinal tract at different times, i...
October 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29150657/specific-heat-electrical-resistivity-and-electronic-band-structure-properties-of-noncentrosymmetric-th7fe3-superconductor
#14
V H Tran, M Sahakyan
Noncentrosymmetric superconductor Th7Fe3 has been investigated by means of specific heat, electrical resisitivity measurements and electronic properties calculations. Sudden drop in the resistivity at 2.05 ± 0.15 K and specific heat jump at 1.98 ± 0.02 K are observed, rendering the superconducting transition. A model of two BCS-type gaps appears to describe the zero-magnetic-field specific heat better than those based on the isotropic BCS theory or anisotropic functions. A positive curvature of the upper critical field H c2(T c) and nonlinear field dependence of the Sommerfeld coefficient at 0...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146299/functional-connectivity-during-affective-mentalizing-in-criminal-offenders-with-psychotic-disorders-associations-with-clinical-symptoms
#15
Carla L Harenski, Vince D Calhoun, Juan R Bustillo, Brian W Haas, Jean Decety, Keith A Harenski, Michael F Caldwell, Gregory J Van Rybroek, Michael Koenigs, David M Thornton, Kent A Kiehl
Psychotic disorders are associated with neurobehavioral impairments in mental state attribution (mentalizing). These impairments are most severe in psychotic patients with elevated symptom levels, particularly negative and cognitive symptoms. There have been few studies of functional connectivity related to mentalizing in psychotic disorders and associations with symptoms. We conducted a functional MRI study of affective mentalizing in individuals with psychotic disorders and varying symptom levels (positive, negative, cognitive)...
November 6, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29143409/chronnectome-fingerprinting-identifying-individuals-and-predicting-higher-cognitive-functions-using-dynamic-brain-connectivity-patterns
#16
Jin Liu, Xuhong Liao, Mingrui Xia, Yong He
The human brain is a large, interacting dynamic network, and its architecture of coupling among brain regions varies across time (termed the "chronnectome"). However, very little is known about whether and how the dynamic properties of the chronnectome can characterize individual uniqueness, such as identifying individuals as a "fingerprint" of the brain. Here, we employed multiband resting-state functional magnetic resonance imaging data from the Human Connectome Project (N = 105) and a sliding time-window dynamic network analysis approach to systematically examine individual time-varying properties of the chronnectome...
November 15, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29127302/ferroelectric-thin-film-acoustic-devices-with-electrical-multiband-switching-ability
#17
Sergey V Ptashnik, Anatoliy K Mikhailov, Alexander V Yastrebov, Peter K Petrov, Wei Liu, Neil McN Alford, Soeren Hirsch, Andrey B Kozyrev
Design principles of a new class of microwave thin film bulk acoustic resonators with multiband resonance frequency switching ability are presented. The theory of the excitation of acoustic eigenmodes in multilayer ferroelectric structures is considered, and the principle of selectivity for resonator with an arbitrary number of ferroelectric layers is formulated. A so called "criterion function" is suggested that allows to determine the conditions for effective excitation at one selected resonance mode with suppression of other modes...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29109974/laboratory-unraveling-of-matter-accretion-in-young-stars
#18
Guilhem Revet, Sophia N Chen, Rosaria Bonito, Benjamin Khiar, Evgeny Filippov, Costanza Argiroffi, Drew P Higginson, Salvatore Orlando, Jérôme Béard, Marius Blecher, Marco Borghesi, Konstantin Burdonov, Dimitri Khaghani, Kealan Naughton, Henri Pépin, Oliver Portugall, Raphael Riquier, Rafael Rodriguez, Sergei N Ryazantsev, Igor Yu Skobelev, Alexander Soloviev, Oswald Willi, Sergey Pikuz, Andrea Ciardi, Julien Fuchs
Accretion dynamics in the formation of young stars is still a matter of debate because of limitations in observations and modeling. Through scaled laboratory experiments of collimated plasma accretion onto a solid in the presence of a magnetic field, we open a first window on this phenomenon by tracking, with spatial and temporal resolution, the dynamics of the system and simultaneously measuring multiband emissions. We observe in these experiments that matter, upon impact, is ejected laterally from the solid surface and then refocused by the magnetic field toward the incoming stream...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29109291/observation-of-a-remarkable-reduction-of-correlation-effects-in-bacr2as2-by-arpes
#19
Jayita Nayak, Kai Filsinger, Gerhard H Fecher, Stanislav Chadov, Ján Minár, Emile D L Rienks, Bernd Büchner, Stuart P Parkin, Jörg Fink, Claudia Felser
The superconducting phase in iron-based high-[Formula: see text] superconductors (FeSC), as in other unconventional superconductors such as the cuprates, neighbors a magnetically ordered one in the phase diagram. This proximity hints at the importance of electron correlation effects in these materials, and Hund's exchange interaction has been suggested to be the dominant correlation effect in FeSCs because of their multiband nature. By this reasoning, correlation should be strongest for materials closest to a half-filled [Formula: see text] electron shell (Mn compounds, hole-doped FeSCs) and decrease for systems with both higher (electron-doped FeSCs) and lower (Cr-pnictides) [Formula: see text] counts...
November 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29091619/multiband-absorbers-for-the-long-wave-infrared-regime
#20
Victoria A Carey, Mark S Mirotznik
We present the development of a long-wave infrared regime multiband absorption filter with simultaneous wavelength and intensity selectivity. The approach employs a technique we call "spectral dithering" to place single-band absorbing pixels across a unit cell such that their weighted sum describes a multiband absorption spectrum. The number of absorption bands is proportional to the number of unique pixels present. Pixel patterning controls wavelength selectivity, whereas pixel distribution controls intensity selectivity...
October 20, 2017: Applied Optics
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