Results 271 to 280 of about 175,211 (299)
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Ultrasonic Transmission Speckle Imaging
Ultrasonic Imaging, 1981Speckle interferometry, as developed during the past decade for optical astronomy, is adapted to ultrasonic imaging through water and animal tissue. Experimental results are presented illustrating not only Labeyrie's original idea, but also speckle holography and our recently devised shift-and-add technique. Both incoherent and coherent processing are
R H, Bates, B S, Robinson
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Ultrasonic Reflex Transmission Imaging
Ultrasonic Imaging, 1985Reflex Transmission Imaging (RTI) is a new imaging method by which orthographic transmission images can be made using augmented B-mode equipment. Conventional transmission imaging requires acoustic coupling to large areas on both sides of the body, whereas RTI can be performed from one side with a single, small transducer probe.
P S, Green, M, Arditi
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Ultrasonic imaging of molecular targets
Basic Research in Cardiology, 2008Today nuclear medicine is the only modality that is clinically successful in molecular imaging. However, other modalities compete with its excellent sensitivity in imaging molecular targets. In the last 10 years ultrasound imaging has shown the potential to provide sufficiently high sensitivity for the molecular imaging of vascular targets.
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Restoration of ultrasonic NDE images
IEEE Transactions on Industrial Electronics, 1993The problem of determining the ultrasonic reflectivity function resulting from density changes in a material is posed as an image restoration problem. The received time-domain signal is modeled as resulting from convolution of the acoustic pulse with the reflectivity function with additive noise.
Wesley E. Snyder +2 more
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Ultrasonic colour flow imaging
Physics in Medicine and Biology, 1994Real-time ultrasonic colour flow imaging, which was first demonstrated to be feasible only about a decade ago, has come into widespread clinical use. Ultrasound is scattered by ensembles of red blood cells. The ultrasonic frequency that gives the best signal-to-noise ratio for backscattering from blood depends on the required penetration. The frequency
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Subaperture processing for ultrasonic imaging
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1998Ultrasonic subaperture processing using aperture synthesis and beam space interpolation is presented. The number of beam lines scanning the image plane for a given transmit-receive subaperture combination is chosen according to the spatial sampling criteria for that combination.
M, Karaman, M, O'Donnell
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Ultrasonic Techniques for Molecular Imaging
Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005., 2006Molecular imaging employs the use of site-targeted contrast agents that, once bound, indicate the expression of a molecular signal uniquely associated with a specific disease state. Ultrasonic contrast agents including microbubbles, nanoparticles, and liposomes have been successfully targeted towards angiogenesis associated with tumor growth ...
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Ultrasonic imaging of soft tissues
Clinical Radiology, 1989As a technique that excels in the demonstration of soft tissues it seems obvious that ultrasound should be used in the study of abnormalities of muscle and subcutaneous tissue. However, the field has been surprisingly slow to develop. This probably results mainly from lack of familiarity with the technique in those departments dealing with these ...
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Segmentation of Ultrasonic Images of the Carotid
2005A new algorithm for an effective and automatic segmentation of the carotid wall in ultrasonic images is proposed. It combines the speed of thresholding algorithms with the accuracy, flexibility and robustness of a successful geometric active contour model which incorporates an optimal image segmentation model in a level set framework.
Rui Rocha +2 more
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Ultrasonic image generating apparatus and ultrasonic image generating method
The Journal of the Acoustical Society of America, 2004The ultrasonic image generating system has an ultrasonic beam output device which outputs a beam to a predetermined subject area, a receiving device which receives the reflected wave from the area, an image generating device which generates an image from the reflected wave and a beam output direction controller which performs control of changing the ...
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