A5089747323- Cerebrovascular and Carotid Artery Diseases
- Cardiovascular Health and Disease Prevention
- Underwater Acoustics Research
- Acute Ischemic Stroke Management
- Traumatic Brain Injury and Neurovascular Disturbances
- Intracranial Aneurysms: Treatment and Complications
- Geophysical Methods and Applications
- Optical Imaging and Spectroscopy Techniques
- Electrostatics and Colloid Interactions
- Advanced Scientific Techniques and Applications
- Seismic Waves and Analysis
- Water Quality Monitoring Technologies
- Hydrology and Sediment Transport Processes
- Hydraulic flow and structures
- Hemodynamic Monitoring and Therapy
- S100 Proteins and Annexins
- Environmental and Industrial Safety
- Shoulder Injury and Treatment
- Scientific Research and Discoveries
- Musicians’ Health and Performance
- Regional Development and Policy
- Sepsis Diagnosis and Treatment
- Coal Combustion and Slurry Processing
- Geotechnical and Geomechanical Engineering
- Elbow and Forearm Trauma Treatment
Martini Ziekenhuis
2010-2024
Universidade de São Paulo
2023
University of Ulsan
2011
Asan Medical Center
2011
University College London
2011
St George's, University of London
2011
Krajská Nemocnice Liberec
2007
Iran University of Medical Sciences
2007
Hospital Universitario Son Dureta
2007
Wolters Kluwer (Netherlands)
1989-2001
Whether surgery is beneficial for patients with asymptomatic carotid stenosis controversial. Better methods of identifying who are likely to develop stroke would improve the risk-benefit ratio endarterectomy. We aimed investigate whether detection embolic signals by use transcranial doppler (TCD) could predict risk in stenosis.The Asymptomatic Carotid Emboli Study (ACES) was a prospective observational study at least 70% from 26 centres worldwide. To detect presence signals, had two 1 h TCD...
Better methods are required to identify patients with asymptomatic carotid stenosis (ACS) at risk of future stroke. Two potential markers high echolucent plaque morphology on ultrasound and embolic signals (ES) in the ipsilateral middle cerebral artery transcranial Doppler (TCD). We explored predictive value a score based these 2 measures prospective, observational, international multicenter Asymptomatic Carotid Emboli Study.A total 435 recruited subjects ACS ≥70% had baseline images TCD...
Measured and theoretical total cross sections for aqueous suspensions of lead glass polystyrene beads are presented. Attenuation is measured from 1 to 100 MHz in a recirculating suspension circuit using swept-frequency system broadband transducer pairs. The calculations employ the phase shift formalism coherent removal rigid scatterer background. Good agreement between theory experiment obtained both types particle, departures sphere section due resonance scattering. features bead dominated...
Results are presented from an acoustic attenuation spectroscopy study of suspensions irregularly shaped sediment particles and nominally spherical lead-glass beads. The measured spectra cover a wide frequency band 1–100 MHz. It is shown that the can be brought into close agreement with rigid movable sphere model using two equivalent size parameters. One parameter diameter dG equal cross-sectional area sphere, used to scale obtain nondimensional size/frequency ka. other dp volume particle...
Introduction: The increase in arterial blood pressure occurring with aging is considered an important risk factor for end-organ damage in, among others, the brain. How exactly this emerges largely unknown. Methods: We investigated effect of on middle cerebral flow velocity (MCAFV) and noninvasive (NIBP) 105 healthy volunteers aged 18 to 82 years. Both pulsatile signals were analyzed determining first (Sys1) second systolic peak (Sys2) diastolic 560 ms after stroke onset (D560). Results: For...
<title>Abstract</title> <bold>Background: </bold>Transcranial Doppler (TCD) is a noninvasive bedside tool for intracerebral hemodynamic assessments in multiple clinical scenarios. TCD, by means of measuring systolic and diastolic blood velocities allows the calculation pulsatility index (PI), parameter that correlated with intracranial pressure (ICP). Nevertheless, predictive value PI raised ICP appears to be low, since it subjected several, often confounding factors not related ICP....
The MAST III Project "TRIDISMA" was designed to develop and extend the quantitative use of acoustics in studying sediment resuspension processes by incorporating theoretical experimental evaluation inversion backscattering problem. As part this objective a prototype acoustic instrument (APRI) has been developed which combines multi-frequency backscatter, coherent Doppler correlation techniques provide high-resolution measurements flow suspension field. Trials laboratory version have...
BACKGROUND: Transcranial Doppler ultrasound (TCD) is a frequently used method to monitor brain perfusion during and following carotid endarterectomy (CEA). Our aim was define the normally occurring changes of intracranial hemodynamics in patients undergoing CEA measuring recently developed TCD parameters.METHODS: A retrospective, single-center cohort study performed. Patients were evaluated pre- postoperatively from day 0 3 middle cerebral artery flow velocity (MCAFV). The parameters...
The insitu measurement of the size distribution and concentration suspended sediment, by means technique acoustic attenuation spectroscopy in frequency range 1–100 MHz, is discussed. Results laboratory experiments well-defined conditions are presented to illustrate possibilities develop a general analysis method, for apriori unknown particle distributions. For spherical scatterers, satisfactory phyiscal interpretation spectra can be given [A. E. Hay A. S. Schaafsma, J. Acoust. Soc. Am. 85,...
*Martini Hospital Groningen, Department of Klinische Neurofysiologie; †Neuromon BV, The Netherlands
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The EC-funded TRIDISMA project was established to develop a prototype instrument measure the profiles of suspended sand flux close seabed using non-intrusive acoustic methods. instrument, consisting 6 vertical, closely-spaced transducers, operating at frequencies between 0.5 and 5MHz, used coherent Doppler vertical velocities, cross-correlation for 2 horizontal velocities backscattered intensity concentration size. Tests in an oscillating water tunnel with steady flows oscillatory currents...