Results 301 to 310 of about 286,343 (348)
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Doppler and color Doppler imaging in acute transplant failure
Journal of Clinical Ultrasound, 1992AbstractMost renal transplants are lost by rejection. A method is required to identify and discriminate between this and acute tubular necrosis and cyclosporin toxicity. The sonogram of the normal renal transplant is characteristic. Early Doppler studies measuring a rise in vascular impedance in acute rejection showed a high sensitivity and specificity.
M, Pelling, P A, Dubbins
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Nature, 1987
AbstractBy simultaneous processing of frequency, phase, and amplitude information in the backscattered ultrasound signal, new instruments now permit the realtime display of high‐resolution grey scale images of tissue combined with the simultaneous display of flow data from vessels within the scan plane.
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AbstractBy simultaneous processing of frequency, phase, and amplitude information in the backscattered ultrasound signal, new instruments now permit the realtime display of high‐resolution grey scale images of tissue combined with the simultaneous display of flow data from vessels within the scan plane.
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Laser Doppler Perfusion Imaging
Conference on Lasers and Electro-Optics Europe, 1996Laser Doppler Perfusion Imaging (LDPI) creates two-dimensional flow-maps of the tissue perfusion. A laser beam scans the tissue surface step-wise by means of a computer controlled stepper motor system that forms an integral part of a camera-like device positioned above the tissue surface.
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Doppler and Zeeman Doppler Imaging of Stars
2016In this chapter we discuss the problem of reconstructing two-dimensional stellar surface maps from the variability of intensity and/or polarisation profiles of spectral lines. We start by outlining the main principles of the scalar Doppler imaging problem concerned with recovering maps of chemical spots, temperature or brightness from the intensity ...
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1981
The search for a practical, clinically applicable system for non-invasive detection and diagnosis of atherosclerosis followed early demonstrations that ultrasound could be used. Pulse-echo systems were the first to be investigated and showed that, although plaque could be visualized or its absorption properties made apparent in vivo, some types of ...
John M. Reid +2 more
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The search for a practical, clinically applicable system for non-invasive detection and diagnosis of atherosclerosis followed early demonstrations that ultrasound could be used. Pulse-echo systems were the first to be investigated and showed that, although plaque could be visualized or its absorption properties made apparent in vivo, some types of ...
John M. Reid +2 more
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[Signal processing in ultrasound imaging, Doppler and Doppler imaging].
Ultraschall in der Medizin (Stuttgart, Germany : 1980), 1994The main purpose of signal processing in ultrasound imaging is the improvement of the image quality. The basics of three-dimensional, nonlinear image filtering are described in a simple way. For Doppler several million operations are computed per second to obtain the velocity distribution as a function of time.
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Doppler echocardiography. II. Color Doppler imaging.
The Veterinary clinics of North America. Small animal practice, 1999Color Doppler imaging (CDI) is a sophisticated form of ultrasound technology that overlays blood flow and velocity information onto a B-mode, two-dimensional, gray-scale image. This imaging technique--also called color Doppler echocardiography, color-coded Doppler, Doppler color-flow imaging, and color-flow imaging--is a type of pulsed-wave Doppler ...
J D, Bonagura, M W, Miller
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International Journal of Imaging Systems and Technology, 1989
AbstractWe review various narrow‐band range‐Doppler imaging methods that have been proposed for radar and highlight the difficulties in their implementation and their limitations. We also present two new imaging schemes. The first involves the transmission of multiplexed chirps, and the second involves simple frequency division multiplexing. The second
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AbstractWe review various narrow‐band range‐Doppler imaging methods that have been proposed for radar and highlight the difficulties in their implementation and their limitations. We also present two new imaging schemes. The first involves the transmission of multiplexed chirps, and the second involves simple frequency division multiplexing. The second
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2004
The transjugular intrahepatic portosystemic shunt (TIPS) is a nonsurgical method of decompressing the portal venous system. TIPS involves the creation of a portosystemic shunt by forming an intrahepatic tract between the hepatic and portal veins using angiographic techniques.
G. Nics, R Karnel
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The transjugular intrahepatic portosystemic shunt (TIPS) is a nonsurgical method of decompressing the portal venous system. TIPS involves the creation of a portosystemic shunt by forming an intrahepatic tract between the hepatic and portal veins using angiographic techniques.
G. Nics, R Karnel
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Astronomische Nachrichten, 2002
I present a literature survey of the currently available Doppler images of cool stars. The 65 individual stars with Doppler images consist of 29 single stars and 36 components in close binaries. Out of the total, 31 were observed only once but 12 stars are (or were) being monitored for years. Each image for each star is identified with the time when it
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I present a literature survey of the currently available Doppler images of cool stars. The 65 individual stars with Doppler images consist of 29 single stars and 36 components in close binaries. Out of the total, 31 were observed only once but 12 stars are (or were) being monitored for years. Each image for each star is identified with the time when it
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