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hyperspectral imaging

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https://www.readbyqxmd.com/read/28338100/hyperspectral-imaging-using-the-single-pixel-fourier-transform-technique
#1
Senlin Jin, Wangwei Hui, Yunlong Wang, Kaicheng Huang, Qiushuai Shi, Cuifeng Ying, Dongqi Liu, Qing Ye, Wenyuan Zhou, Jianguo Tian
Hyperspectral imaging technology is playing an increasingly important role in the fields of food analysis, medicine and biotechnology. To improve the speed of operation and increase the light throughput in a compact equipment structure, a Fourier transform hyperspectral imaging system based on a single-pixel technique is proposed in this study. Compared with current imaging spectrometry approaches, the proposed system has a wider spectral range (400-1100 nm), a better spectral resolution (1 nm) and requires fewer measurement data (a sample rate of 6...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28335211/noise-removal-with-maintained-spatial-resolution-in-raman-images-of-cells-exposed-to-submicron-polystyrene-particles
#2
Linnea Ahlinder, Susanne Wiklund Lindström, Christian Lejon, Paul Geladi, Lars Österlund
The biodistribution of 300 nm polystyrene particles in A549 lung epithelial cells has been studied with confocal Raman spectroscopy. This is a label-free method in which particles and cells can be imaged without using dyes or fluorescent labels. The main drawback with Raman imaging is the comparatively low spatial resolution, which is aggravated in heterogeneous systems such as biological samples, which in addition often require long measurement times because of their weak Raman signal. Long measurement times may however induce laser-induced damage...
April 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28330736/hyperspectral-imaging-using-near-infrared-spectroscopy-to-monitor-coat-thickness-uniformity-in-the-manufacture-of-a-transdermal-drug-delivery-system
#3
Naresh Pavurala, Xiaoming Xu, Yellela S R Krishnaiah
Hyperspectral imaging using near infrared spectroscopy (NIRS) integrates spectroscopy and conventional imaging to obtain both spectral and spatial information of materials. The non-invasive and rapid nature of hyperspectral imaging using NIRS makes it a valuable process analytical technology (PAT) tool for in-process monitoring and control of the manufacturing process for transdermal drug delivery systems (TDS). The focus of this investigation was to develop and validate the use of Near Infra-red (NIR) hyperspectral imaging to monitor coat thickness uniformity, a critical quality attribute (CQA) for TDS...
March 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28321882/optical-dynamic-analysis-of-thrombus-inside-a-centrifugal-blood-pump-during-extracorporeal-mechanical-circulatory-support-in-a-porcine-model
#4
Tatsuki Fujiwara, Daisuke Sakota, Katsuhiro Ohuchi, Shu Endo, Tomoki Tahara, Tomotaka Murashige, Ryo Kosaka, Keiji Oi, Tomohiro Mizuno, Osamu Maruyama, Hirokuni Arai
Complications due to pump thrombus remain the weak point of mechanical circulatory support (MCS), such as the use of a left ventricular assist device (LVAD) or extracorporeal membrane oxygenation, leading to poor outcomes. Hyperspectral imaging (HSI) is an effective imaging method using a hyperspectral (HS) camera, which comprises a spectrophotometer and a charge-coupled device camera to discriminate thrombus from whole blood. Animal experiments were conducted to analyze dynamic imaging of thrombus inside a prototype of a hydrodynamically levitated centrifugal blood pump using an HSI system...
March 20, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28319560/rash-diagnostics-an-update-on-the-diagnosis-of-allergic-rashes
#5
Corinne Savides Happel
PURPOSE OF REVIEW: The purpose of this review is to summarize recent research regarding the diagnosis of allergic rashes and to suggest future directions for the promotion of accurate diagnosis and endotype specification. RECENT FINDINGS: Multiple cohort studies demonstrate that with appropriate clinical evaluation, drug allergy labels can be removed in up to 90% of cases. Genetic tests can predict severe adverse cutaneous drug reactions in some cases and in vitro tests are being sought to identify causative drugs in others...
March 17, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28317720/non-destructive-determination-and-visualisation-of-insoluble-and-soluble-dietary-fibre-contents-in-fresh-cut-celeries-during-storage-periods-using-hyperspectral-imaging-technique
#6
Ling Yan, Chuanwu Xiong, Hao Qu, Changhong Liu, Wei Chen, Lei Zheng
The feasibility of using hyperspectral imaging technique to non-destructively determine insoluble dietary fibre (IDF) and soluble dietary fibre (SDF) contents in fresh-cut celeries and visualise their spatial distribution during 28-day storage periods was investigated. Genetic synergy interval partial least square (GA-Si-PLS) algorithm was developed to establish calibration model, which, superior to the PLS and Si-PLS developed models, achieved the prediction performance with Rp of 0.9638 and 0.9756, and RMSEP of 1...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28290663/mode-coupling-in-plasmonic-heterodimers-probed-with-electron-energy-loss-spectroscopy
#7
Valentin Flauraud, Gabriel D Bernasconi, Jérémy Butet, Duncan T L Alexander, Olivier J F Martin, Jürgen Brugger
While plasmonic antennas composed of building blocks made of the same material have been thoroughly studied, recent investigations have highlighted the unique opportunities enabled by making compositionally asymmetric plasmonic systems. So far, mainly heterostructures composed of nanospheres and nanodiscs have been investigated, revealing opportunities for the design of Fano resonant nanostructures, directional scattering, sensing and catalytic applications. In this article, an improved fabrication method is reported that enables precise tuning of the heterodimer geometry, with interparticle distances made down to a few nanometers between Au-Ag and Au-Al nanoparticles...
March 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28278463/band-selection-for-nonlinear-unmixing-of-hyperspectral-images-as-a-maximal-clique-problem
#8
Tales Imbiriba, Jose Carlos Bermudez, Cedric Richard
Kernel-based nonlinear mixing models have been applied to unmix spectral information of hyperspectral images when the type of mixing occurring in the scene is too complex or unknown. Such methods, however, usually require the inversion of matrices of sizes equal to the number of spectral bands. Reducing the computational load of these methods remains a challenge in large scale applications. This paper proposes a centralized band selection (BS) method for supervised unmixing in the reproducing kernel Hilbert space (RKHS)...
March 1, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28275728/assembly-of-mesoscale-helices-with-near-unity-enantiomeric-excess-and-light-matter-interactions-for-chiral-semiconductors
#9
Wenchun Feng, Ji-Young Kim, Xinzhi Wang, Heather A Calcaterra, Zhibei Qu, Louisa Meshi, Nicholas A Kotov
Semiconductors with chiral geometries at the nanoscale and mesoscale provide a rich materials platform for polarization optics, photocatalysis, and biomimetics. Unlike metallic and organic optical materials, the relationship between the geometry of chiral semiconductors and their chiroptical properties remains, however, vague. Homochiral ensembles of semiconductor helices with defined geometries open the road to understanding complex relationships between geometrical parameters and chiroptical properties of semiconductor materials...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28267921/oxygen-nanobubble-tracking-by-light-scattering-in-single-cells-and-tissues
#10
Pushpak Bhandari, Xiaolei Wang, Joseph Irudayaraj
Oxygen nanobubbles (ONBs) have significant potential in targeted imaging and treatment in cancer diagnosis and therapy. Precise localization and tracking of single ONBs is demonstrated based on hyperspectral dark-field microscope (HSDFM) to image and track single oxygen nanobubbles in single cells. ONBs were proposed as promising contrast-generating imaging agents due to their strong light scattering generated from nonuniformity of refractive index at the interface. With this powerful platform, we have revealed the trajectories and quantities of ONBs in cells, and demonstrated the relation between the size and diffusion coefficient...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28248365/hyperspectral-photometric-stereo-for-a-single-capture
#11
Keisuke Ozawa, Imari Sato, Masahiro Yamaguchi
We present a single-capture photometric stereo method using a hyperspectral camera. A spectrally and spatially designed illumination enables a point-wise estimation of reflectance spectra and surface normals from a single hyperspectral image. The illumination works as a reflectance probe in wide spectral regions where reflectance spectra are measured, and the full spectra are estimated by interpolation. It also works as the resource for shadings in other spectral regions. The accuracy of estimation is evaluated in a simulation...
March 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28241562/lookup-table-based-inverse-model-for-mapping-oxygen-concentration-of-cutaneous-microvessels-using-hyperspectral-imaging
#12
Wei Feng, Rui Shi, Chao Zhang, Tingting Yu, Dan Zhu
Hyperspectral imaging combining with skin optical clearing technique provides a possible way to non-invasively monitor hemodynamics of cutaneous microvessels. In order to estimate microvascular blood oxygen saturation, in this work, a lookup-table-based inverse model was developed to extract the microvascular optical and physiological properties using hyperspectral analysis. This approach showed a higher fitting degree than currently existing hyperspectral analysis methods (i.e. multiple linear regression and non-negative least square fit) in estimating blood oxygen saturation...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241538/characterization-of-digital-dispersive-spectrometers-by-low-coherence-interferometry
#13
Ó Martínez-Matos, C Rickenstorff, S Zamora, J G Izquierdo, P Vaveliuk
We propose a procedure to determine the spectral response of digital dispersive spectrometers without previous knowledge of any parameter of the system. The method consists of applying the Fourier transform spectroscopy technique to each pixel of the detection plane, a CCD camera, to obtain its individual spectral response. From this simple procedure, the system-point spread function and the effect of the finite pixel width are taken into account giving rise to a response matrix that fully characterizes the spectrometer...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28231437/classification-of-organic-beef-freshness-using-vnir-hyperspectral-imaging
#14
Stuart O J Crichton, Sascha M Kirchner, Victoria Porley, Stefanie Retz, Gardis von Gersdorff, Oliver Hensel, Martin Weygandt, Barbara Sturm
Consumer trust in the food industry is heavily reliant upon accurate labelling of meat products. As such, methods, which can verify whether meat is correctly labelled are of great value to producers, retailers, and consumers. This paper illustrates two approaches to classify between, fresh and frozen thawed, and in a novel manner matured and matured frozen-thawed, as well as fresh and matured beef using the 500-1010nm waveband, captured using hyperspectral imaging, and CIELAB measurements. The results show successful classification based upon CIELAB between 1) fresh and frozen-thawed (CCR=0...
February 8, 2017: Meat Science
https://www.readbyqxmd.com/read/28213237/revealing-the-location-of-semen-vaginal-fluid-and-urine-in-stained-evidence-through-near-infrared-chemical-imaging
#15
Félix Zapata, Fernando E Ortega-Ojeda, Carmen García-Ruiz
Crime scene investigation (CSI) requires the ultimate available technology for a rapid, non-destructive, and accurate detection of a wide variety of evidence including invisible stains of bodily fluids. Particularly crucial is the discrimination of semen in stained evidence from sexual abuse cases. This is because those evidence have high odds of containing the DNA from the aggressor. To this aim, we demonstrated the potential of near infrared hyperspectral imaging (NIR-HSI) to make visible stains of semen, vaginal fluid, and urine on fabrics, which lays the bases to face the challenging visualization and discrimination of semen within bodily fluids mixtures...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28211855/improved-multi-label-imaging-using-hyperspectral-phaser-analysis
#16
Dustin M Graham
No abstract text is available yet for this article.
February 17, 2017: Lab Animal
https://www.readbyqxmd.com/read/28208191/-urinary-stone-analysis-what-does-the-future-hold-in-store
#17
A Miernik, S Hein, K Wilhelm, M Schoenthaler
Analysis of the composition of a urinary stone is one of the most important steps in the clinical management of patients with urolithiasis. Fourier transform infrared spectroscopy, X-ray diffractometry and petrographic microscopy are the techniques currently used. Novel technical developments in recent years - such as Raman spectroscopy and hyperspectral imaging - have resulted in new approaches to improve urinary stone analysis. In future, table-top portable systems may be used that allow stones to be rapidly examined directly after the operation...
February 16, 2017: Aktuelle Urologie
https://www.readbyqxmd.com/read/28198384/hyperspectral-infrared-nanoimaging-of-organic-samples-based-on-fourier-transform-infrared-nanospectroscopy
#18
Iban Amenabar, Simon Poly, Monika Goikoetxea, Wiwat Nuansing, Peter Lasch, Rainer Hillenbrand
Infrared nanospectroscopy enables novel possibilities for chemical and structural analysis of nanocomposites, biomaterials or optoelectronic devices. Here we introduce hyperspectral infrared nanoimaging based on Fourier transform infrared nanospectroscopy with a tunable bandwidth-limited laser continuum. We describe the technical implementations and present hyperspectral infrared near-field images of about 5,000 pixel, each one covering the spectral range from 1,000 to 1,900 cm(-1). To verify the technique and to demonstrate its application potential, we imaged a three-component polymer blend and a melanin granule in a human hair cross-section, and demonstrate that multivariate data analysis can be applied for extracting spatially resolved chemical information...
February 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28191819/snapshot-linear-stokes-imaging-spectropolarimeter-using-division-of-focal-plane-polarimetry-and-integral-field-spectroscopy
#19
Tingkui Mu, Shaun Pacheco, Zeyu Chen, Chunmin Zhang, Rongguang Liang
In this paper, the design and experimental demonstration of a snapshot linear-Stokes imaging spectropolarimeter (SLSIS) is presented. The SLSIS, which is based on division-of-focal-plane polarimetry with four parallel linear polarization channels and integral field spectroscopy with numerous slit dispersive paths, has no moving parts and provides video-rate Stokes-vector hyperspectral datacubes. It does not need any scanning in the spectral, spatial or polarization dimension and offers significant advantages of rapid reconstruction without heavy computation during post-processing...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28188636/fluorescence-hyperspectral-imaging-technique-for-foreign-substance-detection-on-fresh-cut-lettuce
#20
Changyeun Mo, Giyoung Kim, Moon S Kim, Jongguk Lim, Hyunjeong Cho, Jinyoung Yang Barnaby, Byoung-Kwan Cho
BACKGROUND: Nondestructive methods based on fluorescence hyperspectral imaging (HSI) techniques were developed to detect worms on fresh-cut lettuce. The optimal wavebands for detecting the worms were investigated using the one-way ANOVA and correlation analyses. RESULTS: The worm detection imaging algorithms, RSI-I(492-626)/492 , provided a prediction accuracy of 99.0%. The fluorescence HSI techniques indicated that the spectral images with a pixel size of 1 × 1 mm had the best classification accuracy for worms...
February 11, 2017: Journal of the Science of Food and Agriculture
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