Results 281 to 290 of about 281,646 (345)

Ultrasound to Assess the Temporomandibular Joint of Children With Juvenile Idiopathic Arthritis: A Systematic Review. [PDF]

Int J Dent
Chana J, Baghaei K, Fagundes NCF, Hareendranatan A, Jaremko JL, Twilt M, Almeida FT.   +6 more
europepmc   +1 more source

Time-frequency analysis by the S transform and interpretation of the laser Doppler flowmetry signals: clinic diagnosis applications

, 2005
Saïd Assous
openalex   +1 more source

Nonuniform Doppler extraction-enhanced multichannel extensive cancellation algorithm for passive radar using Iridium satellite signals. [PDF]

Sci Rep
Fu H, Zhang Z, Luo Y, Fu T, Li J, Jian X, Cha H.   +6 more
europepmc   +1 more source

Detection of the Superior Perforator with Doppler Ultrasonography in Superomedial Pedicle Reduction Mammaplasty: A Retrospective Evaluation of Vascular Safety. [PDF]

Eur J Breast Health
Ersan M, Yıldız HA.
europepmc   +1 more source

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Doppler Gyroscopes: Frequency vs Phase Estimation

Physical Review Letters, 2022
We consider the fundamental roles of frequency versus phase in parameter estimation, specifically in the Sagnac effect. We describe a novel, ultrasensitive gyroscope based on the extremely steep frequency-dependent gain of a liquid crystal light valve.
Howell, John C., Kahn, Merav, Grynszpan, Einav, Cohen, Ziv Roi, Residori, Stefania, Bortolozzo, Umberto   +5 more
openaire   +2 more sources

Frequency modulated ultrasonic Doppler flowmeter

Medical & Biological Engineering, 1975
A new ultrasonic Doppler flowmeter based on the concept of a frequency-modulated wave rather than a continuous single frequency is described. Results are presented showing that the flowmeter can accurately measure vessel diameter and range, volume flow remote from the probe, and flow direction, and can, by tracking the probe along the vessel, visualise
K, McCarty, J P, Woodcock
openaire   +2 more sources

Dual beat-frequencies laser Doppler interferometer

Review of Scientific Instruments, 2011
A dual beat-frequencies laser Doppler interferometer which can measure high speed back and forth motion is proposed and demonstrated. In this interferometer, the two frequencies, f1 and f2, emitted by a Zeeman laser are introduced into the signal beams.
A, Takita, H, Ebara, Y, Fujii
openaire   +2 more sources

Pulsed Doppler frequency and carotid stenosis

Journal of Surgical Research, 1987
Two hundred and forty-two internal carotid arteries (ICA) were evaluated by independently interpreted arteriography and pulsed Doppler spectrum analysis using ultrasonic arteriography to evaluate the ability of peak systolic frequency (PSF) to predict the degree of internal carotid stenosis.
W M, Blackshear, K B, Seifert, S, Lamb, V S, Kollipara, F R, Murtagh, C P, Shah, M S, Farber   +6 more
openaire   +2 more sources

Very high frequency pulsed doppler apparatus

Ultrasound in Medicine & Biology, 1989
A study of a method for exploration of microvessels is presented. Theoretical considerations taking into account the backscattering of ultrasound wave from a red cell and the attenuation versus frequency (up to 180 MHz) show that a frequency in the range of 80 to 120 MHz is most favorable for small depths of exploration (300 microns).
M, Berson, F, Patat, Z Q, Wang, D, Besse, L, Pourcelot   +4 more
openaire   +2 more sources

Doppler frequency estimator performance analysis

International Conference on Acoustics, Speech, and Signal Processing, 2002
A novel realistic model for Doppler signals is investigated. The intended application is the accurate estimation of a train's speed using an onboard Doppler radar. The signal is shown to be conveniently modeled by a sine wave amplitude modulated by an autoregressive process.
O. Besson, F. Castanie
openaire   +1 more source