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https://www.readbyqxmd.com/read/29150155/the-association-of-functional-capacity-with-right-atrial-deformation-in-patients-with-pulmonary-arterial-hypertension-a-study-with-two-dimensional-speckle-tracking
#1
Weiwei Liu, Yueheng Wang, Jinling Zhou, Hui Bai, Feng Wang, Ju Wang
BACKGROUND: The purpose of this study was to assess right atrial (RA) myocardial mechanics in pulmonary hypertension (PH) patients using two-dimensional speckle tracking (2D-STE), and define the relationship between RA function and exercise capacity in PH patients. METHODS: Thirty-eight consecutive PH patients were studied and compared with a control group of 25 healthy volunteers. Peak atrial longitudinal strain (PALS), RA strain rate were measured in all subjects...
April 13, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29148272/adolf-friedrich-fercher-a-pioneer-of-biomedical-optics
#2
Christoph K Hitzenberger
Adolf Friedrich Fercher, an outstanding pioneer of biomedical optics, passed away earlier this year. He was a brilliant and visionary researcher who pioneered various fields of biomedical optics, such as laser speckle flowgraphy, tissue interferometry, and optical coherence tomography (OCT). On the occasion of the 25th anniversary of OCT, this paper reviews and commemorates Fercher's pioneering work.
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29146482/impaired-left-atrial-strain-as-a-predictor-of-new-onset-atrial-fibrillation-after-aortic-valve-replacement-independently-of-left-atrial-size
#3
Guilherme Pessoa-Amorim, Jennifer Mancio, Luís Vouga, José Ribeiro, Vasco Gama, Nuno Bettencourt, Ricardo Fontes-Carvalho
INTRODUCTION AND OBJECTIVES: Left atrial dysfunction in aortic stenosis may precede atrial enlargement and predict the occurrence of atrial fibrillation (AF). To test this hypothesis, we assessed left atrial function and determined its impact on the incidence of AF after aortic valve replacement. METHODS: A total of 149 severe aortic stenosis patients (74±8.6 years, 51% men) with no prior AF were assessed using speckle-tracking echocardiography. Left atrial function was evaluated using peak atrial longitudinal strain (PALS), peak atrial contraction strain (PACS), and phasic left atrial volumes...
November 13, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/29144734/physically-unclonable-cryptographic-primitives-by-chemical-vapor-deposition-of-layered-mos2
#4
Abdullah Alharbi, Darren Armstrong, Somayah Alharbi, Davood Shahrjerdi
Physically unclonable cryptographic primitives are promising for securing the rapidly growing number of electronic devices. Here, we introduce a new class of physically unclonable primitives from layered molybdenum disulfide (MoS2) by leveraging the natural randomness of their island growth during chemical vapor deposition (CVD). We synthesize a MoS2 monolayer film covered with speckles of multilayer islands, where the growth process is engineered for an optimal speckle density. Using the Clark-Evans test, we confirm that the distribution of islands on the film exhibits complete spatial randomness, hence indicating the growth of multilayer speckles is a spatial Poisson process...
November 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/29143429/an-overview-of-methods-to-mitigate-artifacts-in-optical-coherence-tomography-imaging-of-the-skin
#5
Saba Adabi, Audrey Fotouhi, Qiuyun Xu, Steve Daveluy, Darius Mehregan, Adrian Podoleanu, Mohammadreza Nasiriavanaki
BACKGROUND: Optical coherence tomography (OCT) of skin delivers three-dimensional images of tissue microstructures. Although OCT imaging offers a promising high-resolution modality, OCT images suffer from some artifacts that lead to misinterpretation of tissue structures. Therefore, an overview of methods to mitigate artifacts in OCT imaging of the skin is of paramount importance. Speckle, intensity decay, and blurring are three major artifacts in OCT images. Speckle is due to the low coherent light source used in the configuration of OCT...
November 16, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/29142812/left-ventricle-relative-apical-sparing-in-cardiac-amyloidosis
#6
Marianna Nardozza, Elisabetta Chiodi, Donato Mele
Amyloidosis is a disease characterized by the extracellular deposition of the protein amyloid. It is a multiorgan disease, and cardiac involvement is not uncommon, generally in the form of a restrictive cardiomyopathy. Typical aspects of cardiac amyloidosis have been described at echocardiography and magnetic resonance imaging (MRI). In particular, the relative apical sparing at two-dimensional speckle-tracking echocardiography has been reported to be specific for cardiac amyloidosis. In our case, we report for the first time that this echocardiographic sign is related to lack of hyperenhancement at late gadolinium enhancement imaging in cardiac MRI...
October 2017: Journal of Cardiovascular Echography
https://www.readbyqxmd.com/read/29142809/is-left-atrial-function-affected-by-coronary-slow-flow-a-two-dimensional-speckle-tracking-echocardiographic-study
#7
Flora Fallah, Sima Narimani, Shima Yarmohammadi, Ali Hosseinsabet, Arash Jalali
Background: The coronary slow flow phenomenon (CSFP) is the slow passage of the angiographic contrast agent to the distal portion of the coronary artery in the absence of significant stenosis. We evaluated the left atrial (LA) function in patients with the CSFP using two-dimensional speckle-tracking echocardiography (2DSTE). Methods: The LA function was compared through 2DSTE between 36 patients with the CSFP and 36 participants with a normal coronary flow. The two groups were matched for age, sex, hypertension, diabetes mellitus, and the left ventricular function...
October 2017: Journal of Cardiovascular Echography
https://www.readbyqxmd.com/read/29140335/improving-the-sensitivity-of-velocity-measurements-in-laser-speckle-contrast-imaging-using-a-noise-correction-method
#8
Yang Wang, Wenzhi Lv, Xiao Chen, Jinling Lu, Pengcheng Li
We demonstrate that noise is an important factor contributing to the decline of sensitivity and linear response range of velocity measurements for laser speckle contrast imaging. We propose to use a noise correction method to improve the sensitivity of velocity measurements. For a kind of camera in which the mean values of the dark noise have been subtracted and negative counts have been set to zero, we propose a method to estimate the true dark noise based on the maximum likelihood estimation, which expands the application scope of the noise correction method...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29138230/head-to-head-comparison-of-global-and-regional-two-dimensional-speckle-tracking-strain-versus-cardiac-magnetic-resonance-tagging-in-a-multicenter-validation-study
#9
Mihaela Silvia Amzulescu, Hélène Langet, Eric Saloux, Alain Manrique, Laurianne Boileau, Alisson Slimani, Pascal Allain, Clotilde Roy, Christophe de Meester, Agnès Pasquet, Mathieu De Craene, David Vancraeynest, Anne-Catherine Pouleur, Jean-Louis J Vanoverschelde, Bernhard L Gerber
BACKGROUND: Despite widespread use to characterize and refine prognosis, validation data of two-dimensional (2D) speckle tracking (2DST) echocardiography myocardial strain measurement remain scarce. METHODS AND RESULTS: Global and regional subendocardial peak-systolic Lagrangian longitudinal (LS) and circumferential strain (CS) by 2DST and 2D-tagged (2DTagg) cardiac magnetic resonance imaging were compared against sonomicrometry in a dynamic heart phantom and among each other in 136 patients included prospectively at 2 centers...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29138199/electrosclerotherapy-for-capillary-malformations-study-protocol-for-a-randomised-within-patient-controlled-pilot-trial
#10
Sophie E R Horbach, Albert Wolkerstorfer, Daniel Martijn de Bruin, Chantal M A M van der Horst
INTRODUCTION: The current state-of-the-art treatment modality for hypertrophic capillary malformations (CMs), laser therapy, has a considerable rate of non-responders and recurrence. Intralesional bleomycin injections (or 'sclerotherapy') are commonly used to treat venous and lymphatic malformations with an excellent effect, but these intravascular injections are not possible in CMs due to the small diameter of the vessels. Electroporation-an electric field applied to the tissue-could increase the permeability of endothelial cells, which could theoretically facilitate targeted localised bleomycin delivery...
November 14, 2017: BMJ Open
https://www.readbyqxmd.com/read/29137850/the-importance-of-subclinical-left-ventricular-dysfunction-and-blood-pressure-pattern-in-asymptomatic-type-2-diabetic-patients-the-diagnostic-and-prognostic-significance-of-tissue-doppler-parameters-left-ventricular-global-longitudinal-strain-and-nighttime
#11
Angelina Stevanovic, Milica Dekleva
The primary aims of this study have been to explore the diagnostic and prognostic significance of Tissue Doppler parameters (TDI), global longitudinal strain (GLS), and blood pressure (BP) pattern in normotensive diabetic patients. METHODS: The study consisted of 121 diabetic patients and 41 healthy subjects. Conventional and TDI echocardiography were performed on all patients, including E/Em (ratio of diastolic velocities). GLS was derived from two-dimensional speckle-tracking. Ambulatory BP monitoring (ABPM) was obtained over 24h...
September 18, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/29137027/morphobiochemical-diagnosis-of-acute-trabecular-microfractures-using-gamma-correction-tc-99m-hdp-pinhole-bone-scan-with-histopathological-verification
#12
Yong-Whee Bahk, Seok-Ha Hwang, U-Young Lee, Yong-An Chung, Joo-Young Jung, Hyeonseok S Jeong
We prospectively performed gamma correction pinhole bone scan (GCPBS) and histopathologic verification study to make simultaneous morphobiochemical diagnosis of trabecular microfractures (TMF) occurred in the femoral head as a part of femoral neck fracture.Materials consisted of surgical specimens of the femoral head in 6 consecutive patients. The specimens were imaged using Tc-99m hydroxymethylene diphosphonate (HDP) pinhole scan and processed by the gamma correction. After cleansing with 10% formalin solution, injured specimen surface was observed using a surgical microscope to record TMF...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29134302/nuclear-organization-during-in-vitro-differentiation-of-porcine-mesenchymal-stem-cells-mscs-into-adipocytes
#13
Joanna Stachecka, Agnieszka Walczak, Beata Kociucka, Błażej Ruszczycki, Grzegorz Wilczyński, Izabela Szczerbal
Differentiation of progenitor cells into adipocytes is accompanied by remarkable changes in cell morphology, cytoskeletal organization, and gene expression profile. Mature adipocytes are filled with a large lipid droplet and the nucleus tends to move to the cell periphery. It was hypothesized that the differentiation process is also associated with changes of nuclear organization. The aim of this study was to determine the number and distribution of selected components of nuclear architecture during porcine in vitro adipogenesis...
November 13, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/29133588/quantitative-analysis-of-multilayer-organization-of-proteins-and-rna-in-nuclear-speckles-at-super-resolution
#14
Jingyi Fei, Mahdieh Jadaliha, Tyler S Harmon, Isaac T S Li, Boyang Hua, Qinyu Hao, Alex S Holehouse, Matthew Reyer, Qinyu Sun, Susan M Freier, Rohit V Pappu, Kannanganattu V Prasanth, Taekjip Ha
Nuclear speckles are self-assembled organelles composed of RNAs and proteins. They are proposed to act as structural domains that control distinct steps in gene expression, including transcription, splicing, and mRNA export. Earlier studies identified differential localization of a few components within the speckles. It was speculated that the spatial organization of speckle components might contribute directly to the order of operations that coordinate distinct processes. By performing multi-color structured illumination microscopy, we characterized the multilayer organization of speckles at a higher resolution...
November 13, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29133425/matter-wave-speckle-observed-in-an-out-of-equilibrium-quantum-fluid
#15
Pedro E S Tavares, Amilson R Fritsch, Gustavo D Telles, Mahir S Hussein, François Impens, Robin Kaiser, Vanderlei S Bagnato
We report the results of the direct comparison of a freely expanding turbulent Bose-Einstein condensate and a propagating optical speckle pattern. We found remarkably similar statistical properties underlying the spatial propagation of both phenomena. The calculated second-order correlation together with the typical correlation length of each system is used to compare and substantiate our observations. We believe that the close analogy existing between an expanding turbulent quantum gas and a traveling optical speckle might burgeon into an exciting research field investigating disordered quantum matter...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29133200/histologic-and-hemodynamic-correlates-of-right-ventricular-function-in-a-pressure-overload-model-a-study-using-three-dimensional-speckle-tracking-echocardiography
#16
Yuman Li, Lei Li, Junwei Liu, Mengmei Li, Qing Lv, Jing Wang, Lin He, Mingxing Xie
The aim of our study was to assess the characterization of right ventricular (RV) deformation using three-dimensional (3D) speckle tracking echocardiography (STE) and association of 3D-STE indices with histologic and hemodynamic parameters in a chronic RV pressure overload animal model. Pulmonary artery banding (PAB) was used to induce RV pressure overload in seven beagles. 3D-STE, histologic and hemodynamic measurements were performed in PAB and sham-operated beagles 3 mo after PAB. RV longitudinal, radial and circumferential strain was measured from 3D-STE...
November 10, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29131515/enhanced-resolution-and-speckle-free-three-dimensional-printing-of-macular-optical-coherence-tomography-angiography
#17
Peter M Maloca, Richard F Spaide, Simon Rothenbuehler, Hendrik P N Scholl, Tjebo Heeren, João E Ramos de Carvalho, Mali Okada, Pascal W Hasler, Catherine Egan, Adnan Tufail
No abstract text is available yet for this article.
November 13, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29131189/3d-shape-deformation-and-vibration-measurements-using-infrared-kinect-sensors-and-digital-image-correlation
#18
Hieu Nguyen, Zhaoyang Wang, Patrick Jones, Bing Zhao
Consumer-grade red-green-blue and depth (RGB-D) sensors, such as the Microsoft Kinect and the Asus Xtion, are attractive devices due to their low cost and robustness for real-time sensing of depth information. These devices provide the depth information by detecting the correspondences between the captured infrared (IR) image and the initial image sent to the IR projector, and their essential limitation is the low accuracy of 3D shape reconstruction. In this paper, an effective technique that employs the Kinect sensors for accurate 3D shape, deformation, and vibration measurements is introduced...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29131175/speckle-pattern-sequential-extraction-metric-for-estimating-the-focus-spot-size-on-a-remote-diffuse-target
#19
Zhan Yu, Yuanyang Li, Lisheng Liu, Jin Guo, Tingfeng Wang, Guoqing Yang
The speckle pattern (line by line) sequential extraction (SPSE) metric is proposed by the one-dimensional speckle intensity level crossing theory. Through the sequential extraction of received speckle information, the speckle metrics for estimating the variation of focusing spot size on a remote diffuse target are obtained. Based on the simulation, we will give some discussions about the SPSE metric range of application under the theoretical conditions, and the aperture size will affect the metric performance of the observation system...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29128888/two-dimensional-speckle-tracking-global-longitudinal-strain-in-high-sensitivity-troponin-negative-low-risk-patients-with-unstable-angina-a-resting-ischemia-test
#20
Patrícia Marques-Alves, Nuno Espírito-Santo, Rui Baptista, Rogério Teixeira, Rui Martins, Francisco Gonçalves, Mariano Pego
With the introduction of high-sensitivity troponin (hsTNI) assays, the clinical significance unstable angina (UA) has become uncertain. We hypothesized that impaired left ventricular (LV) two-dimensional speckle-tracking echocardiography (2D-STE)-derived peak global longitudinal strain (GLS) was able to exclude the presence of significant coronary artery disease (CAD) in UA patients without prior cardiovascular (CV) events and with a normal LV ejection fraction (LVEF). From a cohort of 200 patients admitted with UA, we selected 61 patients without prior CV events and with a normal LVEF; of these, 48 (79%) underwent invasive coronary angiography (ICA) and 24 (39%) had at least ≥ 1 significant stenosis...
November 11, 2017: International Journal of Cardiovascular Imaging
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