نتایج جستجو برای: microembolic signals

تعداد نتایج: 189578  

2013
Zoltán Csanádi Edina Nagy-Baló Diana Tint Marcell Clemens Ildikó Beke Katalin Réka Kovács

Edina Nagy-Baló, Diana Tint, Marcell Clemens, Ildikó Beke, Katalin Réka Kovács, László Isolation: A Comparison of Two Ablation Techniques Transcranial Measurement of Cerebral Microembolic Signals During Pulmonary Vein Print ISSN: 1941-3149. Online ISSN: 1941-3084 Copyright © 2013 American Heart Association, Inc. All rights reserved. Avenue, Dallas, TX 75231 is published by the American Heart As...

2005
S. Colantonio O. Salvetti F. Sartucci

The aim of this work was the definition of a method devoted to the automated recognition of different composition of cerebral microemboli. The developed diagnostic procedure made use of a feature-based analysis of ultrasonographic images containing the characteristic microembolic signals. The images were acquired with a transcranial Doppler and classified using a hierarchical neural network. Th...

2005
Zoltán NAGY

s: Greber C, Karapanayiotides T, Ruchat P, Kemény V, Piechowski-Jozwiak B, Despland PA, Bogousslavsky J, Devuyst G. The cognitive impact ofcarotid endarterectomy: benefit and for whom? Cerebrovasc Dis 2003;16(suppl4):42. Karapanayiotides T, Ruchat P, Darbellay G, Kemény V, Piechowski-Jozwiak B, Vesin JM, Despland PA, Bogousslavsky J, Devuyst G. What is thenature and clinical...

Journal: :Stroke 1998
F Ries K Tiemann C Pohl C Bauer M Mundo H Becher

BACKGROUND AND PURPOSE High-intensity transient signals (HITS) detected by transcranial Doppler ultrasonography correspond to microemboli in intracranial arteries. The purpose of this study was to develop new diagnostic criteria for the differentiation of these microembolic signals from artifact, based on a high-resolution analysis of Doppler power spectra in an in vitro model. METHODS Two hu...

2016
Maroun Geryes Sébastien Ménigot Walid Hassan Ali Mcheick Jamal Charara Jean-Marc Girault

Robust detection of the smallest circulating cerebral microemboli is an efficient way of preventing strokes, which is second cause of mortality worldwide. Transcranial Doppler ultrasound is widely considered the most convenient system for the detection of microemboli. The most common standard detection is achieved through the Doppler energy signal and depends on an empirically set constant thre...

Journal: :Ultrasound in medicine & biology 2011
Jean-Marc Girault Denis Kouamé Sébastien Ménigot Grégrory Souchon François Tranquart

The purpose of this study was to reveal the cause of frequency modulation (FM) present in microembolic Doppler ultrasound signals. This novel explanation should help the development of sensitive microembolus discrimination techniques. We suggest that the frequency modulation detected is caused by the ultrasonic radiation force (URF) acting directly on microemboli. The frequency modulation and t...

Journal: :Stroke 2017
Dong Yeop Kim Jeong Pyo Son Je Young Yeon Gyeong-Moon Kim Jong-Soo Kim Seung-Chyul Hong Oh Young Bang

BACKGROUND AND PURPOSE Moyamoya disease (MMD) is a unique cerebrovascular disease characterized by the progressive stenosis of large intracranial arteries and a hazy network of basal collaterals, called moyamoya vessels. Although hemodynamic studies have been applied in MMD patients, the mechanisms of stroke in MMD are still unclear. The present study evaluated the infarct pattern and collatera...

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