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https://www.readbyqxmd.com/read/28430305/turbulence-measurements-in-an-axial-rotary-blood-pump-with-laser-doppler-velocimetry
#1
Chan Y Schüle, Klaus Affeld, Max Kossatz, Christian O Paschereit, Ulrich Kertzscher
BACKGROUND: The implantation of rotary blood pumps as ventricular assist devices (VADs) has become a viable therapy for quite a number of patients with end-stage heart failure. However, these rotary blood pumps cause adverse events that are related to blood trauma. It is currently believed that turbulence in the pump flow plays a significant role. But turbulence has not been measured to date because there is no optical access to the flow space in rotary blood pumps because of their opaque casings...
April 18, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28430261/wideband-spectrum-analysis-of-ultra-high-frequency-radio-wave-signals-due-to-advanced-one-phonon-non-collinear-anomalous-light-scattering
#2
Alexandre S Shcherbakov, Adan Omar Arellanes
We present a principally new acousto-optical cell providing an advanced wideband spectrum analysis of ultra-high frequency radio-wave signals. For the first time, we apply a recently developed approach with the tilt angle to a one-phonon non-collinear anomalous light scattering. In contrast to earlier cases, now one can exploit a regime with the fixed optical wavelength for processing a great number of acoustic frequencies simultaneously in the linear regime. The chosen rutile-crystal combines a moderate acoustic velocity with low acoustic attenuation and allows us wide-band data processing within GHz-frequency acoustic waves...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429817/investigation-of-bacterial-viability-from-incubated-saliva-by-application-of-flow-cytometry-and-hyphenated-separation-techniques
#3
Bogusław Buszewski, Maciej Milanowski, Tomasz Ligor, Paweł Pomastowski
The aim of the study was determination of bacterial viability in saliva samples and finding a correlation between microbiological and volatile profiles of saliva depending on incubation time. Bacteria colonizing healthy oral cavities were also identified. Twelve healthy adults donated unstimulated saliva samples. Flow cytometry, optical density measurements and colony-forming unit (CFU) counting method were employed for analyses of native and inoculated saliva after 0, 1, 2, 24 and 48 h of incubation. Volatile profiles were acquired using headspace-solid phase microextraction-gas chromatography/mass spectrometry (HS-SPME-GC/MS)...
April 21, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28429124/how-bumblebees-use-lateral-and-ventral-optic-flow-cues-for-position-control-in-environments-of-different-proximity
#4
Nellie Linander, Emily Baird, Marie Dacke
Flying insects frequently navigate through environments of different complexity. In this study, buff-tailed bumblebees (Bombus terrestris L.) were trained to fly along tunnels of different widths, from 60 to 240 cm. In tunnel widths of 60 and 120 cm, bumblebees control their lateral position by balancing the magnitude of translational optic flow experienced in the lateral visual field of each eye. In wider tunnels, bumblebees use translational optic flow cues in the ventral visual field to control their lateral position and to steer along straight tracks...
April 20, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28427411/tendon-motion-tracking-in-an-ultrasound-image-sequence-using-optical-flow-based-block-matching
#5
Bo-I Chuang, Jian-Han Hsu, Li-Chieh Kuo, I-Ming Jou, Fong-Chin Su, Yung-Nien Sun
BACKGROUND: Tendon motion, which is commonly observed using ultrasound imaging, is one of the most important features used in tendinopathy diagnosis. However, speckle noise and out-of-plane issues make the tracking process difficult. Manual tracking is usually time consuming and often yields inconsistent results between users. METHODS: To automatically track tendon motion in ultrasound images, we developed a new method that combines the advantages of optical flow and multi-kernel block matching...
April 20, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28426631/directional-changes-in-tissue-reflectivity-may-influence-flow-detection-on-optical-coherence-tomography-angiography
#6
Rosa Dolz-Marco, K Bailey Freund
PURPOSE: To determine if directional or anatomical changes in tissue reflectivity of Henle fiber layer (HFL) may influence flow detection on optical coherence tomography angiography (OCT-A). METHODS: Cross-sectional analysis of consecutive cases undergoing OCT-A. Directional changes in visualization of HFL were either produced manually by moving the beam entrance within the pupil or observed occurring naturally because of tilting of the OCT line-scan within a myopic staphyloma...
April 19, 2017: Retina
https://www.readbyqxmd.com/read/28426133/quantitative-phase-microscopy-spatial-signatures-of-cancer-cells
#7
Darina Roitshtain, Lauren Wolbromsky, Evgeny Bal, Hayit Greenspan, Lisa L Satterwhite, Natan T Shaked
We present cytometric classification of live healthy and cancerous cells by using the spatial morphological and textural information found in the label-free quantitative phase images of the cells. We compare both healthy cells to primary tumor cells and primary tumor cells to metastatic cancer cells, where tumor biopsies and normal tissues were isolated from the same individuals. To mimic analysis of liquid biopsies by flow cytometry, the cells were imaged while unattached to the substrate. We used low-coherence off-axis interferometric phase microscopy setup, which allows a single-exposure acquisition mode, and thus is suitable for quantitative imaging of dynamic cells during flow...
April 20, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28425281/hybridized-c-o-si-interface-states-at-the-origin-of-efficiency-improvement-in-cnt-si-solar-cell
#8
Stefano Ponzoni, Simona Achilli, Chiara Pintossi, Giovanni Drera, Luigi Sangaletti, Paola Castrucci, Maurizio De Crescenzi, Stefania Pagliara
Despite the astonishing values of the power conversion efficiency reached, in just less than a decade, by the carbon nanotube / silicon (CNT/Si) solar cells, many doubts remain on the underlying transport mechanisms across the CNT/Si heterojunction. Here, by combining transient optical spectroscopy in the femtosecond timescale, X-ray photoemission and a systematic tracking of I-V curves across all phases of the interlayer SiOx growth at the interface, we grasp the mechanism that adequately preserves charge separation at the junction, hindering the photoexcited carrier recombination...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28424747/association-between-optic-nerve-head-microcirculation-and-macular-ganglion-cell-complex-thickness-in-eyes-with-untreated-normal-tension-glaucoma-and-a-hemifield-defect
#9
Ayako Anraku, Kyoko Ishida, Nobuko Enomoto, Seiji Takagi, Hiroyuki Ito, Asuka Takeyama, Fumihiko Yagi, Goji Tomita
Purpose. We evaluated the association between optic nerve head (ONH) microcirculation and macular ganglion cell complex (mGCC) thickness in patients with untreated normal tension glaucoma (NTG) and a hemifield defect. Methods. The medical records of 47 patients with untreated NTG were retrospectively reviewed. Laser speckle flowgraphy was used to obtain mean blur rate (MBR), a relative measure of blood flow. Average total deviation (TD), mGCC, and the circumpapillary retinal nerve fiber layer (cpRNFL) thickness were also analyzed...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28424487/power-flow-in-a-large-core-multimode-fiber-under-external-perturbation-and-its-applications
#10
Sen Qian, Yang Xu, Lisheng Zhong, Lei Su
Large core optical multimode fiber provides benefits such as a large light-coupling tolerance, easy handling, and delivery of higher light power without undesirable nonlinear effects. In this research, we exploit the effects of external perturbation on the power flow within the large core fiber and present two relevant applications, namely a perturbation sensor and a doughnut beam tuner. Since conventional multimode fiber power flow model does not take into consideration the perturbation effect, we modify the power flow model so that the influence of time varying perturbation can be theoretically analyzed...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28423634/early-assessment-of-tumor-response-to-photodynamic-therapy-using-combined-diffuse-optical-and-diffuse-correlation-spectroscopy-to-predict-treatment-outcome
#11
Patricia Thong, Kijoon Lee, Hui-Jin Toh, Jing Dong, Chuan-Sia Tee, Kar-Perng Low, Pui-Haan Chang, Ramaswamy Bhuvaneswari, Ngian-Chye Tan, Khee-Chee Soo
Photodynamic therapy (PDT) of cancer involves the use of a photosensitizer that can be light-activated to eradicate tumors via direct cytotoxicity, damage to tumor vasculature and stimulating the body's immune system. Treatment outcome may vary between individuals even under the same regime; therefore a non-invasive tumor response monitoring system will be useful for personalization of the treatment protocol. We present the combined use of diffuse optical spectroscopy (DOS) and diffuse correlation spectroscopy (DCS) to provide early assessment of tumor response...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28422681/fast-median-filtering-for-phase-or-orientation-data
#12
Martin Storath, Andreas Weinmann
Median filtering is among the most utilized tools for smoothing real-valued data, as it is robust, edge-preserving, valuepreserving, and yet can be computed efficiently. For data living on the unit circle, such as phase data or orientation data, a filter with similar properties is desirable. For these data, there is no unique means to define a median; so we discuss various possibilities. The arc distance median turns out to be the only variant which leads to robust, edge-preserving and value-preserving smoothing...
April 12, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28419622/quantitative-depth-resolved-microcirculation-imaging-with-optical-coherence-tomography-angiography-part-%C3%AE-blood-flow-velocity-imaging
#13
Wanrong Gao
The research goal of the microvascular network imaging with optical coherence tomography (OCT) angiography is to achieve depth resolved blood flow and vessel imaging in vivo in the clinical management of patents. In this review, we review the main phenomena that have been explored in OCT to image the blood flow velocity vector and the vessels of the microcirculation within living tissues. Parameters that limit the accurate measurements of blood flow velocity are then condisered. Finally, initial Clinic diagnosis applications of and future developments are discussed...
April 17, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28419395/choriocapillaris-changes-imaged-by-oct-angiography-after-half-dose-photodynamic-therapy-for-chronic-central-serous-chorioretinopathy
#14
Kyoko Fujita, Akiyuki Kawamura, Mitsuko Yuzawa
BACKGROUND AND OBJECTIVE: To evaluate the choriocapillaris using optical coherence tomographic angiography (OCTA) after half-dose verteporfin photodynamic therapy (hd-PDT) for chronic central serous chorioretinopathy (CSC). PATIENTS AND METHODS: We studied six eyes (six patients) with chronic CSC treated by hd-PDT. OCTA was performed before, 1 week after, and 1 month after hd-PDT. The area of flow abnormality at the choriocapillaris level within the PDT spot after hd-PDT was compared with that before hd-PDT...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28418506/an-improved-optical-flow-method-for-blood-velocimetry
#15
Zifeng Yang, Hongtao Yu, George P Huang, Bryan Ludwig
Detailed blood velocity map in vascular system can be obtained by applying the optical flow method (OFM) in processing fluoroscopic digital subtracted catheter angiographic images, however, there are still challenges with the accuracy of this method. In the present study, a divergence compensatory Optical Flow Method (DC-OFM), in which a non-zero divergence of velocity is assumed due to the finite resolution of the image, was explored and applied to the digital subtraction angiography (DSA) images of blood flow...
April 17, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28417585/speckle-variance-optical-coherence-tomography-of-blood-flow-in-the-beating-mouse-embryonic-heart
#16
Olga A Grishina, Shang Wang, Irina V Larina
Efficient separation of blood and cardiac wall in the beating embryonic heart is essential and critical for experiment-based computational modelling and analysis of early-stage cardiac biomechanics. Although speckle variance optical coherence tomography (SV-OCT) relying on calculation of intensity variance over consecutively acquired frames is a powerful approach for segmentation of fluid flow from static tissue, application of this method in the beating embryonic heart remains challenging because moving structures generate SV signal indistinguishable from the blood...
April 18, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28416842/-drainage-characteristic-of-the-brain-interstitial-fluid-detected-by-using-fluorescence-and-magnetic-tracer-method
#17
Y Zhao, Y Q Li, H Y Li, Y L Li, L X Liu, L Yuan, S J Zhang, H B Han
OBJECTIVE: Compare the results of molecular diffusion and mass flow in the interstitial space(ISS) displayed by using optical and magnetic probes and study partitioned drainage of the brain interstitial fluid (ISF). METHODS: In the study, 36 male SD rats were randomly divided into fluorescent inspection group (18), magnetic tracer group (18). Then they were divided equally into caudate nucleus (Cn), thalamus (T) and substantia nigra (Sn) subgroup, 6 rats in each subgroup...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28415521/effect-of-halloysite-nanotubes-on-the-structure-and-function-of-important-multiple-blood-components
#18
Keke Wu, Ru Feng, Yanpeng Jiao, Changren Zhou
Many researchers have investigated the application of halloysite nanotubes (HNTs) in biomedicine, because of their special nanoscale hollow tubular structure. Although the cytocompatibility of HNTs has been studied, their blood compatibility has not been systematically investigated. In this work, the effect of HNTs on the structure and function of different blood components has been studied, including the morphology and hemolysis of red blood cells (RBCs). Based on scanning electron microscopy (SEM) observations, optical density test and flow cytometry analysis, we found that HNTs can affect the morphology and membrane integrity of RBCs in phosphate buffered saline (PBS) in a content-dependent way...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414911/a-platform-for-analysis-of-nanoscale-liquids-with-an-array-of-sensor-devices-based-on-2d-material
#19
Michael Engel, Peter W Bryant, Rodrigo Neumann, Ronaldo Giro, Claudius Feger, Phaedon Avouris, Mathias Steiner
Analysis of nanoscale liquids, including wetting and flow phenomena, is a scientific challenge with far reaching implications for industrial technologies. We report the conception, development, and application of an integrated platform for the experimental characterization of liquids at the nanometer scale. The platform combines the sensing functionalities of a two-dimensional electronic array of sensor devices with in situ application of highly sensitive optical micro-spectroscopy and atomic force microscopy...
April 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28414799/comprehensive-evaluation-of-ten-deformable-image-registration-algorithms-for-contour-propagation-between-ct-and-cone-beam-ct-images-in-adaptive-head-neck-radiotherapy
#20
Xin Li, Yuyu Zhang, Yinghua Shi, Shuyu Wu, Yang Xiao, Xuejun Gu, Xin Zhen, Linghong Zhou
Deformable image registration (DIR) is a critical technic in adaptive radiotherapy (ART) for propagating contours between planning computerized tomography (CT) images and treatment CT/cone-beam CT (CBCT) images to account for organ deformation for treatment re-planning. To validate the ability and accuracy of DIR algorithms in organ at risk (OAR) contour mapping, ten intensity-based DIR strategies, which were classified into four categories-optical flow-based, demons-based, level-set-based and spline-based-were tested on planning CT and fractional CBCT images acquired from twenty-one head & neck (H&N) cancer patients who underwent 6~7-week intensity-modulated radiation therapy (IMRT)...
2017: PloS One
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