Results 61 to 70 of about 3,633,330 (258)

Harmonic analysis of lossy piezoelectric composite transducers using the plane wave expansion method [PDF]

, 2008
Periodic composite ultrasonic transducers oer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode.
Hayward, Gordon, Mulholland, Anthony J., Orr, Leigh-Ann, O'Leary, Richard L.   +3 more
core   +4 more sources

Natural Frequencies of Levodopa‐Induced Dyskinesia in Parkinson's Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives Abnormal involuntary movements, known as dyskinesias, are common complications of levodopa treatment in patients with Parkinson's disease and can significantly impair quality of life. The underlying pathophysiology remains unclear, and current therapeutic options are limited.
Ioannis U. Isaias, Federica Avantaggiato, Gianni Pezzoli, Andrea Canessa   +3 more
wiley   +1 more source

Compound Mask for Divergent Wave Imaging in Medical Ultrasound

IEEE Access
Divergent wave imaging with coherent compounding allows obtaining broad field-of-view and higher frame rate with respect to line-by-line insonification. However, the spatial and contrast resolution crucially depends on the weights applied in the compound
Zahraa Alzein, Marco Crocco, Daniele D. Caviglia   +2 more
doaj   +1 more source

Plane-Wave Imaging Challenge in Medical Ultrasound [PDF]

2016 IEEE International Ultrasonics Symposium (IUS), 2016
Plane-Wave imaging enables very high frame rates, up to several thousand frames per second. Unfortunately the lack of transmit focusing leads to reduced image quality, both in terms of resolution and contrast. Recently, numerous beamforming techniques have been proposed to compensate for this effect, but comparing the different methods is difficult due
Liebgott, Herve, Molares, Alfonso Rodriguez, Jensen, Jørgen Arendt; id_orcid 0000-0002-7896-3136, Cervenansky, F., Jensen, Jørgen Arendt; id_orcid 0000-0002-7896-3136, Bernard, O.   +5 more
openaire   +1 more source

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

Terahertz single pixel imaging based on a Nipkow disk [PDF]

, 2012
We describe a terahertz single pixel imaging system based on a Nipkow disk. Nipkow disks have been used for fast scanning imaging systems since the first experimental television was invented in 1926.
Saha, S., Cumming, D., Ma, Y., Grant, J.
core   +1 more source

Impact of Age on the Diagnostic Yield of Routine EEG in People With Childhood or Juvenile Absence Epilepsy: A Cross‐Sectional Study

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background We aimed to identify the proportion of individuals with a confirmed diagnosis of childhood absence epilepsy (CAE) or juvenile absence epilepsy (JAE) who show a negative routine EEG (rEEG), and to determine the main factors associated with this finding.
Francesco Fortunato, Alessia Giugno, Miriam Sturniolo, Enrico Fratto, Pio Zoleo, Francesca Felicia Operto, Ilaria Sammarra, Antonio Gambardella   +7 more
wiley   +1 more source

High-Frame-Rate 3-D Vector Flow Imaging in the Frequency Domain

Applied Sciences, 2020
Ultrasound vector Doppler techniques for three-dimensional (3-D) blood velocity measurements are currently limited by low temporal resolution and high computational cost.
Stefano Rossi, Alessandro Ramalli, Fabian Fool, Piero Tortoli   +3 more
doaj   +1 more source

Artificial Intelligence in Systemic Sclerosis: Clinical Applications, Challenges, and Future Directions

Arthritis Care &Research, EarlyView.
Systemic sclerosis (SSc) is a rare autoimmune disease defined by immune dysregulation, vasculopathy, and progressive fibrosis of the skin and internal organs. Despite advances in care, major complications such as interstitial lung disease (ILD) and myocardial involvement remain the leading causes of morbidity and mortality.
Cristiana Sieiro Santos, José Miguel Sequí‐Sabater, Diego Benavent   +2 more
wiley   +1 more source

Doppler Spectra for Stationary and Dynamic Ultrasonic Fields

East European Journal of Physics
This paper presents a review of physical and methodological approaches to describing the spectrum of the ultrasonic Doppler signal in biological media.
Mykhailo O. Hrytsenko, Evgen A. Barannik
doaj   +1 more source