Results 271 to 280 of about 20,605,475 (335)

Tracking in High-Frame-Rate Imaging

Ultrasonic Imaging, 2010
Speckle tracking has been used for motion estimation in ultrasound imaging. Unlike conventional Doppler techniques, which are angle-dependent, speckle tracking can be utilized to estimate velocity vectors. However, the accuracy of speckle-tracking methods is limited by speckle decorrelation, which is related to the displacement between two consecutive ...
Shih-Ying, Wu, Shun-Li, Wang, Pai-Chi, Li   +2 more
openaire   +2 more sources

Carotid artery wall dynamics captured with multi-plane high-frame-rate imaging

IUS, 2015
Plaques within the carotid artery show different dynamic behavior during fast pressure waves that propagate along the wall. These dynamic tissue-wave interactions can be captured in a longitudinal view of the carotid artery using high-frame-rate ...
P. Kruizinga, F. Mastik, J. Bosch, Antonius F. W. van der Steen, Nico de Jong   +4 more
semanticscholar   +2 more sources

Effects of phase aberration on high frame rate imaging

Ultrasound in Medicine & Biology, 2000
A high frame-rate (HFR) imaging method (about 3750 frames/s for imaging of biological soft tissues at a depth of 200 mm) has been developed recently with limited diffraction beams. This method uses the fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) to construct images, and can be implemented with simple and inexpensive hardware,
J Y, Lu, S, He
openaire   +2 more sources

A General Model of High Frame Rate Imaging System

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005
A kind of high frame rate (HFR) 2D and 3D imaging method was developed in 1997. Because only one transmission is required to construct an image, this method can reach an ultra high frame rate (about 3750 volumes or frames per second for biological soft tissues at a depth of 200 mm).
Peng, Hu, Lu, Jianyu, Han, Xuemei, Feng, Huanqing   +3 more
openaire   +2 more sources

Ultra-high Frame Rate Tissue Doppler Imaging

Ultrasound in Medicine & Biology, 2014
We describe a new tissue Doppler imaging (TDI) method, ultra-high frame rate tissue Doppler imaging (UFR-TDI). With two broad transmit beams covering only the ventricular walls, we achieve 1200 frames/s in a four-chamber apical view. We examined 10 healthy volunteers to study the feasibility of this method.
Birger, Brekke, Lars C L, Nilsen, Joakim, Lund, Hans, Torp, Tore, Bjastad, Brage H, Amundsen, Asbjorn, Stoylen, Svein A, Aase   +7 more
openaire   +2 more sources

Performance of a high-frame-rate CCD imager

SPIE Proceedings, 1992
Back-illuminated, 16-port 512 X 512 and 32-port 1024 X 1024 charge coupled device (CCD) imagers have been fabricated. The measured performance of the 512 X 512 pixel chip is described, including data on quantum efficiency, dynamic range, dark current, frame rates, uniformity, contrast transfer function, and on-chip correlated double- sampling (CDS ...
Peter A. Levine, Donald J. Sauer, Fu-Lung Hseuh, Frank V. Shallcross, Grazyna M. Meray, Gordon C. Taylor, Gary W. Hughes, John M. Pellegrino, Deborah R. Simon, Lorna J. Harrison, William B. Lawler   +10 more
openaire   +1 more source

High frame rate tissue Doppler imaging

2001 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.01CH37263), 2002
In tissue Doppler and strain rate imaging of the heart, a high frame rate is necessary to capture the rapid relaxations and contractions of the myocardium. Previously, the Doppler and tissue B-mode images have been calculated from different pulse transmissions. To improve the temporal resolution, we present a new acquisition technique where the Doppler
S. Bjaerum, H. Torp, K. Kristoffersen
openaire   +1 more source

High-frame-rate image acquisition system

SPIE Proceedings, 1994
ABSTRACT A compact and fully integrated, high-frame-rate and high-resoluuon digital image acquisitionand analysis system has been developed. The system integrates highspeed data acquisition, imageplayback, image processing, and motion analysis features.
William B. Lawler, Lorna J. Harrison, Alexandru V. Aciu   +2 more
openaire   +1 more source

High Frame Rate Imaging to Enhance the Dissolution of Histotripsy-Induced Bubble Clouds

IUS, 2019
Histotripsy is a focused ultrasound therapy for tissue ablation with bubble cloud activity. Persistent bubble clouds reduce the ablative capacity of histotripsy.
K. Bader, Pauline Severino, Samuel A. Hendley, Gregory A. Anthony, Viktor Bollen   +4 more
semanticscholar   +1 more source

High frame rate fluorescence lifetime imaging

Journal of Physics D: Applied Physics, 2003
A fast time-domain based fluorescence lifetime imaging (FLIM) microscope is presented that can operate at frame rates of hundreds of frames per second. A beam splitter in the detection path of a wide-field fluorescence microscope divides the fluorescence in two parts. One part is optically delayed with respect to the other. Both parts are viewed with a
Agronskaia, A.V., Tertoolen, L.G.J., Gerritsen, H.C.   +2 more
openaire   +2 more sources