نتایج جستجو برای: dimensional speckle

تعداد نتایج: 406318  

2016
Anita Kalapos

I. Nemes A, Kalapos A, Domsik P, Forster T. Left ventricular strain reduction is not confinied to the noncompacted segments in noncompaction cardiomyopathy – a threedimensional speckle tracking echocardiographic study. Eur Heart J Cardiovasc Imaging 2013; 14 (Suppl 2.); ii35. II. Nemes A, Kalapos A, Domsik P, Lengyel Cs, Orosz A, Forster T. Relationship between three-dimensional speckle trackin...

Journal: :Optics express 2005
Jennifer Barton Steven Stromski

Doppler optical coherence tomography (DOCT) is a valuable tool for depth-resolved flow measurements in tissue. However, DOCT is insensitive to flow in the direction normal to the imaging beam and requires knowledge of the phase of the demodulated signal. We present an alternative method of extracting flow information, using speckle of conventional amplitude optical coherence tomography images. ...

2016
António J. Pereira Paulo Aguiar Michael Belsley Helder Maiato

The understanding of cytoskeleton dynamics has benefited from the capacity to generate fluorescent fiducial marks on cytoskeleton components. Here we show that light-induced imprinting of three-dimensional (3D) fluorescent speckles significantly improves speckle signal and contrast relative to classic (random) fluorescent speckle microscopy. We predict theoretically that speckle imprinting usin...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده برق و کامپیوتر 1393

بیش از سه دهه از به کارگیری گسترده رادار روزنه مصنوعی (sar) برای سنجش از راه دور در کاربردهای نظامی و غیرنظامی می¬گذرد.رادار روزنه مصنوعی امکان تصویربرداری در شب یا روز، تصویربرداری در شرایط آب و هوایی مختلف، تصویربرداری از اهداف پنهان شده و دستیابی به تفکیک¬پذیری مستقل از برد را فراهم می¬کند. یکی از معایب تصویر sar، وجود speckle است. این پدیده در اثر توزیع تصادفی چندین پراکنده¬ساز در هر سلول ت...

2015
Noha Hassanin

Objective: Assessment of left atrium (LA) deformation by 2-Dimensional Speckle Strain Imaging (2DSI) has been recently proposed as an alternative method of exploring LA function. The purpose of this study was to assess the relationship of LA function, particularly reservoir function, with LA structural remodeling related to left ventricular hypertrophy (LVH) in patients with hypertension (HTN) ...

2014
Ran Chen Xia Wu Li-Jun Shen Bei Wang Ming-Ming Ma Yuan Yang Bo-Wen Zhao

BACKGROUND Several studies have demonstrated that uremic patients who have preserved left ventricular ejection fraction (LVEF) could still have the potential for systolic dysfunction. The aim of this study was to assess the differences between the left ventricular (LV) myocardial function in hemodialysis and nondialysis uremic patients based on three-dimensional speckle-tracking echocardiograph...

Journal: :Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine 2012
Jonathan M Rubin Mary Feng Scott W Hadley J Brian Fowlkes James D Hamilton

We prospectively evaluated real-time ultrasound speckle tracking for monitoring soft tissue motion for image-guided radiotherapy. Two human volunteers and 1 patient with a proven hepatocellular carcinoma, who was being prepared for radiation therapy treatment, were scanned using a clinical ultrasound scanner modified to acquire and store radiofrequency signals. Scans were performed of the liver...

G. Moghimislam, H. Latifi, M. R. Riahi,

The average velocity of water flow has been simultaneously measured with fluorescent and speckle imaging methods. The measured velocities with two methods are in good agreement with each other and it confirms that the speckle imaging method can be used as a confident method to measure the velocity of water flow in a dry leaf. Also the velocity of water flow through thick and thin xylems of a le...

Journal: :Journal of the American College of Cardiology 2014

Journal: :European journal of echocardiography : the journal of the Working Group on Echocardiography of the European Society of Cardiology 2011
Yumi Iwamura Tetsuhiro Yamano Takamitsu Sakai Takahisa Sawada Hiroaki Matsubara

ment of left atrial appendage function with transthoracic tissue Doppler echocardiography. Eur J Echocardiogr 2009;10:363–71. 143. Inaba Y, Yuda S, Kobayashi N, Hashimoto A, Uno K, Nakata T et al. Strain rate imaging for noninvasive functional quantification of the left atrium: comparative studies in controls and patients with atrial fibrillation. J Am Soc Echocardiogr 2005; 18:729–36. 144. D’A...

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