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https://www.readbyqxmd.com/read/28641255/piecewise-linear-approximation-of-vector-valued-images-and-curves-via-2nd-order-variational-model
#1
Massimo Zanetti, Lorenzo Bruzzone
Variational models are known to work well for addressing image restoration/regularization problems. However, most of the methods proposed in literature are defined for scalar inputs and are used on multiband images (such as RGB or multispectral imagery) by the composition of a simple band-wise processing. This involves suboptimal results and may introduce artifacts. Only in a few cases variational models are extended to the case of vector-valued inputs. However, the known implementations are restricted to 1st-order models, while 2nd-order models are never considered...
June 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28626793/acidic-ph-targeted-chitosan-capped-mesoporous-silica-coated-gold-nanorods-facilitate-detection-of-pancreatic-tumors-via-multispectral-optoacoustic-tomography
#2
Matthew R Zeiderman, Desiree E Morgan, John D Christein, William E Grizzle, Kelly M McMasters, Lacey R McNally
We present a cancer nanomedicine based on acidic pH targeted gold nanorods designed for multispectral optoacoustic tomography (MSOT). We have designed gold nanorods coated with mesoporous silica and subsequently capped with chitosan (CMGs). We have conjugated pH-sensitive variant 7 pHLIP peptide to the CMGs (V7-CMG) to provide targeting specificity to the acidic tumor microenvironment. In vitro, treatment of S2VP10 and MiaPaca2 cells with V7-CMG containing gemcitabine resulted in significantly greater cytotoxicity with 97% and 96...
July 11, 2016: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/28617497/flexible-hybrid-graphene-a-si-h-multispectral-photodetectors
#3
D S Schneider, A Bablich, M C Lemme
We report on the integration of large area CVD grown single- and bilayer graphene transparent conductive electrodes (TCEs) on amorphous silicon multispectral photodetectors. The broadband transmission of graphene results in 440% enhancement of the detectors' spectral response in the ultraviolet (UV) region at λ = 320 nm compared to reference devices with conventional aluminum doped zinc oxide (ZnO:Al) electrodes. The maximum responsivity of the multispectral photodetectors can be tuned in their wavelength from 320 nm to 510 nm by an external bias voltage, allowing single pixel detection of UV to visible light...
June 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28615944/the-interactions-of-single-wall-carbon-nanohorns-with-polar-epithelium
#4
Yujie Shi, Zujin Shi, Suxin Li, Yuan Zhang, Bing He, Dong Peng, Jie Tian, Ming Zhao, Xueqing Wang, Qiang Zhang
Single-wall carbon nanohorns (SWCNHs), which have multitudes of horn interstices, an extensive surface area, and a spherical aggregate structure, offer many advantages over other carbon nanomaterials being used as a drug nanovector. The previous studies on the interaction between SWCNHs and cells have mostly emphasized on cellular uptake and intracellular trafficking, but seldom on epithelial cells. Polar epithelium as a typical biological barrier constitutes the prime obstacle for the transport of therapeutic agents to target site...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28614416/multispectral-imaging-reveals-biblical-period-inscription-unnoticed-for-half-a-century
#5
Shira Faigenbaum-Golovin, Anat Mendel-Geberovich, Arie Shaus, Barak Sober, Michael Cordonsky, David Levin, Murray Moinester, Benjamin Sass, Eli Turkel, Eli Piasetzky, Israel Finkelstein
Most surviving biblical period Hebrew inscriptions are ostraca-ink-on-clay texts. They are poorly preserved and once unearthed, fade rapidly. Therefore, proper and timely documentation of ostraca is essential. Here we show a striking example of a hitherto invisible text on the back side of an ostracon revealed via multispectral imaging. This ostracon, found at the desert fortress of Arad and dated to ca. 600 BCE (the eve of Judah's destruction by Nebuchadnezzar), has been on display for half a century. Its front side has been thoroughly studied, while its back side was considered blank...
2017: PloS One
https://www.readbyqxmd.com/read/28614337/dual-axis-optical-coherence-tomography-for-deep-tissue-imaging
#6
Yang Zhao, Will J Eldridge, Jason R Maher, Sanghoon Kim, Michael Crose, Mohamed Ibrahim, Howard Levinson, Adam Wax
We have developed dual-axis optical coherence tomography (DA-OCT) which enables deep tissue imaging by using a novel off-axis illumination/detection configuration. DA-OCT offers a 100-fold speed increase compared with its predecessor, multispectral multiple-scattering low coherence interferometry (ms2/LCI), by using a new beam scanning mechanism based on a microelectro-mechanical system (MEMS) mirror. The data acquisition scheme was altered to take advantage of this scanning speed, producing tomographic images at a rate of 4 frames (B-scans) per second...
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28593563/spatio-temporal-monitoring-of-cotton-cultivation-using-ground-based-and-airborne-multispectral-sensors-in-gis-environment
#7
Antonis Papadopoulos, Dionissios Kalivas, Sid Theocharopoulos
Multispectral sensor capability of capturing reflectance data at several spectral channels, together with the inherent reflectance responses of various soils and especially plant surfaces, has gained major interest in crop production. In present study, two multispectral sensing systems, a ground-based and an aerial-based, were applied for the multispatial and temporal monitoring of two cotton fields in central Greece. The ground-based system was Crop Circle ACS-430, while the aerial consisted of a consumer-level quadcopter (Phantom 2) and a modified Hero3+ Black digital camera...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28587192/high-dynamic-range-spectral-imaging-pipeline-for-multispectral-filter-array-cameras
#8
Pierre-Jean Lapray, Jean-Baptiste Thomas, Pierre Gouton
Spectral filter arrays imaging exhibits a strong similarity with color filter arrays. This permits us to embed this technology in practical vision systems with little adaptation of the existing solutions. In this communication, we define an imaging pipeline that permits high dynamic range (HDR)-spectral imaging, which is extended from color filter arrays. We propose an implementation of this pipeline on a prototype sensor and evaluate the quality of our implementation results on real data with objective metrics and visual examples...
June 3, 2017: Sensors
https://www.readbyqxmd.com/read/28584107/adaptive-self-organization-of-bali-s-ancient-rice-terraces
#9
J Stephen Lansing, Stefan Thurner, Ning Ning Chung, Aurélie Coudurier-Curveur, Çağil Karakaş, Kurt A Fesenmyer, Lock Yue Chew
Spatial patterning often occurs in ecosystems as a result of a self-organizing process caused by feedback between organisms and the physical environment. Here, we show that the spatial patterns observable in centuries-old Balinese rice terraces are also created by feedback between farmers' decisions and the ecology of the paddies, which triggers a transition from local to global-scale control of water shortages and rice pests. We propose an evolutionary game, based on local farmers' decisions that predicts specific power laws in spatial patterning that are also seen in a multispectral image analysis of Balinese rice terraces...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28580979/design-of-tpgs-functionalized-cu3bis3-nanocrystals-with-strong-absorption-in-the-second-near-infrared-window-for-radiation-therapy-enhancement
#10
Jiangfeng Du, Xiaopeng Zheng, Yuan Yong, Jie Yu, Xinghua Dong, Chenyang Zhang, Ruyi Zhou, Bai Li, Liang Yan, Chunying Chen, Zhanjun Gu, Yuliang Zhao
Integrating radiation therapy with high-depth photothermal therapy in the second near-infrared (NIR) window is highly required for efficient treatment of deep-seated tumor cells. Here, we constructed a multifunctional nano-theranostic with bimetallic chalcogenide nanocrystals (NCs) functionalized with amphiphilic d-α-tocopherol polyethylene glycol 1000 succinate (TPGS-Cu3BiS3). Benefiting from the strong absorbance of both X-ray and NIR light in the second NIR window, TPGS-Cu3BiS3 CNs can not only deposit more radiation dose to trigger enhanced radiation damage in vivo, but also conduct photo-induced hyperthermia for thermal ablation in the second NIR window and effective improvement of tumor oxygenation to overcome the hypoxia-associated radio-resistance of tumors...
June 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/28575931/recent-forest-cover-changes-2002-2015-in-the-southern-carpathians-a-case-study-of-the-iezer-mountains-romania
#11
Bogdan Mihai, Ionuț Săvulescu, Marina Rujoiu-Mare, Constantin Nistor
The paper explores the dynamics of the forest cover change in the Iezer Mountains, part of Southern Carpathians, in the context of the forest ownership recovery and deforestation processes, combined with the effects of biotic and abiotic disturbances. The aim of the study is to map and evaluate the typology and the spatial extension of changes in the montane forest cover between 700 and 2462m a.s.l., sampling all the representative Carpathian ecosystems, from the European beech zone up to the spruce-fir zone and the subalpine-alpine pastures...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28569858/quasi-phase-matched-multispectral-kerr-frequency-comb
#12
Shu-Wei Huang, Abhinav Kumar Vinod, Jinghui Yang, Mingbin Yu, Dim-Lee Kwong, Chee Wei Wong
We study a new type of Kerr frequency comb where the momentum conservation law is fulfilled by azimuthal modulation of the waveguide dispersion. The concept can expand the parametric range in which a Kerr frequency comb is obtained. In a good agreement with the theoretical analysis, we demonstrate a multispectral Kerr frequency comb covering important fiber-optic communication bands. Comb coherence and absence of a sub-comb offset are confirmed by continuous-wave heterodyne beat note and amplitude noise spectra measurements...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28560239/image-reconstruction-of-oxidized-cerebral-cytochrome-c-oxidase-changes-from-broadband-near-infrared-spectroscopy-data
#13
Sabrina Brigadoi, Phong Phan, David Highton, Samuel Powell, Robert J Cooper, Jeremy Hebden, Martin Smith, Ilias Tachtsidis, Clare E Elwell, Adam P Gibson
In diffuse optical tomography (DOT), overlapping and multidistance measurements are required to reconstruct depth-resolved images of oxy- ([Formula: see text]) and deoxy- (HHb) hemoglobin concentration changes occurring in the brain. These can be considered an indirect measure of brain activity, under the assumption of intact neurovascular coupling. Broadband systems also allow changes in the redox state of cytochrome c oxidase (oxCCO) to be measured, which can be an important biomarker when neurovascular coupling is impaired...
April 2017: Neurophotonics
https://www.readbyqxmd.com/read/28558064/multispectral-image-fusion-for-illumination-invariant-palmprint-recognition
#14
Longbin Lu, Xinman Zhang, Xuebin Xu, Dongpeng Shang
Multispectral palmprint recognition has shown broad prospects for personal identification due to its high accuracy and great stability. In this paper, we develop a novel illumination-invariant multispectral palmprint recognition method. To combine the information from multiple spectral bands, an image-level fusion framework is completed based on a fast and adaptive bidimensional empirical mode decomposition (FABEMD) and a weighted Fisher criterion. The FABEMD technique decomposes the multispectral images into their bidimensional intrinsic mode functions (BIMFs), on which an illumination compensation operation is performed...
2017: PloS One
https://www.readbyqxmd.com/read/28541198/combined-pulse-echo-ultrasound-and-multispectral-optoacoustic-tomography-with-a-multi-segment-detector-array
#15
Elena Mercep, X Luis Dean Ben, Daniel Razansky
The high complementarity of ultrasonography and optoacoustic tomography has prompted the development of combined approaches that utilize the same transducer array for detecting both optoacoustic and pulse-echo ultrasound responses from tissues. Yet, due to the fundamentally different physical contrast and image formation mechanisms, the development of detection technology optimally suited for image acquisition in both modalities remains a major challenge. Herein, we introduce a multi-segment detector array approach incorporating array segments of linear and concave geometry to optimally support both ultrasound and optoacoustic image acquisition...
May 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28540184/detection-of-intramyocardially-injected-dir-labeled-mesenchymal-stem-cells-by-optical-and-optoacoustic-tomography
#16
Markus T Berninger, Pouyan Mohajerani, Moritz Wildgruber, Nicolas Beziere, Melanie A Kimm, Xiaopeng Ma, Bernhard Haller, Megan J Fleming, Stephan Vogt, Martina Anton, Andreas B Imhoff, Vasilis Ntziachristos, Reinhard Meier, Tobias D Henning
The distribution of intramyocardially injected rabbit MSCs, labeled with the near-infrared dye 1,1'-dioctadecyl-3,3,3',3'-tetramethylindotricarbo-cyanine-iodide (DiR) using hybrid Fluorescence Molecular Tomography-X-ray Computed Tomography (FMT-XCT) and Multispectral Optoacoustic Tomography (MSOT) imaging technologies, was investigated. Viability and induction of apoptosis of DiR labeled MSCs were assessed by XTT- and Caspase-3/-7-testing in vitro. 2 × 10(6), 2 × 10(5) and 2 × 10(4) MSCs labeled with 5 and 10 μg DiR/ml were injected into fresh frozen rabbit hearts...
June 2017: Photoacoustics
https://www.readbyqxmd.com/read/28538724/applying-systems-level-spectral-imaging-and-analysis-to-reveal-the-organelle-interactome
#17
Alex M Valm, Sarah Cohen, Wesley R Legant, Justin Melunis, Uri Hershberg, Eric Wait, Andrew R Cohen, Michael W Davidson, Eric Betzig, Jennifer Lippincott-Schwartz
The organization of the eukaryotic cell into discrete membrane-bound organelles allows for the separation of incompatible biochemical processes, but the activities of these organelles must be coordinated. For example, lipid metabolism is distributed between the endoplasmic reticulum for lipid synthesis, lipid droplets for storage and transport, mitochondria and peroxisomes for β-oxidation, and lysosomes for lipid hydrolysis and recycling. It is increasingly recognized that organelle contacts have a vital role in diverse cellular functions...
May 24, 2017: Nature
https://www.readbyqxmd.com/read/28536914/inter-comparison-of-remote-sensing-sensing-based-shoreline-mapping-techniques-at-different-coastal-stretches-of-india
#18
Swathy Sunder, Raaj Ramsankaran, Balaji Ramakrishnan
Many techniques are available for detection of shorelines from multispectral satellite imagery, but the choice of a certain technique for a particular study area can be tough. Hence, for the first time in literature, an inter-comparison of the most widely used shoreline mapping techniques such as Normalized Difference Water Index (NDWI), Modified NDWI (MNDWI), Improved Band Ratio (IBR) Method, and Automatic Water Extraction Index (AWEI) has been done along four different coastal stretches of India using multitemporal Landsat data...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28536045/toward-defining-deep-brain-stimulation-targets-in-mni-space-a-subcortical-atlas-based-on-multimodal-mri-histology-and-structural-connectivity
#19
REVIEW
Siobhan Ewert, Philip Plettig, Ningfei Li, M Mallar Chakravarty, D Louis Collins, Todd M Herrington, Andrea A Kühn, Andreas Horn
Three-dimensional atlases of subcortical brain structures are valuable tools to reference anatomy in neuroscience and neurology. For instance, they can be used to study the position and shape of the three most common deep brain stimulation (DBS) targets, the subthalamic nucleus (STN), internal part of the pallidum (GPi) and ventral intermediate nucleus of the thalamus (VIM) in spatial relationship to DBS electrodes. Here, we present a composite atlas based on manual segmentations of a multimodal high resolution brain template, histology and structural connectivity...
May 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28534815/multispectral-fluorescent-and-photoplethysmographic-imaging-for-remote-skin-assessment
#20
REVIEW
Janis Spigulis
Optical tissue imaging has several advantages over the routine clinical imaging methods, including non-invasiveness (it does not change the structure of tissues), remote operation (it avoids infections) and the ability to quantify the tissue condition by means of specific image parameters. Dermatologists and other skin experts need compact (preferably pocket-size), self-sustaining and easy-to-use imaging devices. The operational principles and designs of ten portable in-vivo skin imaging prototypes developed at the Biophotonics Laboratory of Institute of Atomic Physics and Spectroscopy, University of Latvia during the recent five years are presented in this paper...
May 19, 2017: Sensors
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