Search Results - "von Ramm, Olaf T."

Ultrasound Visualization and Recording of Transient Myocardial Vibrations by Moore, Cooper, McCrary, Andrew W., LeFevre, Melissa, Sturgeon, Gregory M., Barker, Piers A.C., von Ramm, Olaf T.

“…A new visualization and recording method used to assess and quantitate autogenic high-velocity motions in myocardial walls to provide a new description of…”
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High-Frame-Rate Deformation Imaging in Two Dimensions Using Continuous Speckle-Feature Tracking by Andersen, Martin V, Moore, Cooper, Arges, Kristine, Søgaard, Peter, Østergaard, Lasse R, Schmidt, Samuel E, Kisslo, Joseph, Von Ramm, Olaf T

“…Abstract The study describes a novel algorithm for deriving myocardial strain from an entire cardiac cycle using high-frame-rate ultrasound images. Validation…”
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In vivo real-time 3-D intracardiac echo using PMUT arrays by Dausch, David E., Gilchrist, Kristin H., Carlson, James B., Hall, Stephen D., Castellucci, John B., von Ramm, Olaf T.

“…Piezoelectric micromachined ultrasound transducer (PMUT) matrix arrays were fabricated containing novel through-silicon interconnects and integrated into…”
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Real-time three-dimensional echocardiography for determining right ventricular stroke volume in an animal model of chronic right ventricular volume overload by SHIOTA, T, JONES, M, SAHN, D. J, CHIKADA, M, FLEISHMAN, C. E, CASTELLUCCI, J. B, COTTER, B, DEMARIA, A. N, VON RAMM, O. T, KISSLO, J, RYAN, T

“…The lack of a suitable noninvasive method for assessing right ventricular (RV) volume and function has been a major deficiency of two-dimensional (2D)…”
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Quantitative Parameters of High-Frame-Rate Strain in Patients with Echocardiographically Normal Function by Andersen, Martin V., Moore, Cooper, Søgaard, Peter, Friedman, Daniel, Atwater, Brett D., Arges, Kristine, LeFevre, Melissa, Struijk, Johannes J., Kisslo, Joseph, Schmidt, Samuel E., von Ramm, Olaf T.

“…Recently, we developed a high-frame-rate echocardiographic imaging system capable of acquiring images at rates up to 2500 per second. High imaging rates were…”
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Contractile Fronts In The Interventricular Septum: A Case For High Frame Rate Echocardiographic Imaging by Andersen, Martin S., Moore, Cooper, LeFevre, Melissa, Arges, Kristine, Friedman, Daniel J., Atwater, Brett D., Kisslo, Joseph, Søgaard, Peter, Struijk, Johannes J., von Ramm, Olaf T., Schmidt, Samuel E.

“…The real time high frame rate (HFR) 2-dimensional ultrasound system, T5, at Duke University is capable of imaging at up to 1000 images per second for adult…”
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Live high-frame-rate echocardiography by Moore, Cooper, Castellucci, John, Andersen, Martin V., Lefevre, Melissa, Arges, Kristine, Kisslo, Joseph, von Ramm, Olaf T.

“…We describe an advanced real-time high-speed echocardiographic system with live display while scanning. Images are acquired at rates up to 1000 per second for…”
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Theory and operation of 2-D array piezoelectric micromachined ultrasound transducers by Dausch, D., Castellucci, J., Chou, D., von Ramm, O.

“…Piezoelectric micromachined ultrasound transducers (pMUTs) are a new approach for the construction of 2-D arrays for forward-looking 3-D intravascular (IVUS)…”
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Harmonic source wavefront aberration correction for ultrasound imaging by DIANIS, Scott W, VON RAMM, Olaf T

“…A method is proposed which uses a lower-frequency transmit to create a known harmonic acoustical source in tissue suitable for wavefront correction without a…”
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Three-dimensional motion measurements using feature tracking by Kuo, J., von Ramm, O.T.

“…Feature tracking was developed to efficiently compute motion measurements from volumetric ultrasound images. Prior studies have demonstrated the motion…”
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Live volumetric imaging (LVI) intracardiac ultrasound catheter by Dausch, David E, Castellucci, John B, Gilchrist, Kristin H, Carlson, James B, Hall, Stephen D, von Ramm, Olaf T

“…Summary The Live Volumetric Imaging (LVI) catheter is capable of real-time 3D intracardiac echo (ICE) imaging, uniquely providing full volume sectors with deep…”
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Real-time three-dimensional echocardiography for measurement of left ventricular volumes by Schmidt, Michael A., Ohazama, Chikai J., Agyeman, Kwabena O., Freidlin, Raisa Z., Jones, Michael, Laurienzo, Joy M., Brenneman, Cynthia L., Arai, Andrew E., von Ramm, Olaf T., Panza, Julio A.

“…Left ventricular (LV) volumes are important prognostic indexes in patients with heart disease. Although several methods can evaluate LV volumes, most have…”
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Interactive volume rendering of real-time three-dimensional ultrasound images by Kuo, J., Bredthauer, G.R., Castellucci, J.B., von Ramm, O.T.

“…Real-time, three-dimensional (RT3D) ultrasound allows video frame rate volumetric imaging. The ability to acquire full three-dimensional (3-D) image data in…”
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Abstract 14214: Visualization and Quantification of Autogenic Cardiac Mechanical Waves by Moore, Cooper, McCrary, Andrew, LeFevre, Melissa, Barker, Piers, Von Ramm, Olaf T

“…IntroductionWe have developed a visualization technique, High Speed Difference Imaging (HSDI) that has revealed many rapidly propagating phenomena throughout…”
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Real-time 3-dimensional echocardiography for quantification of the difference in left ventricular versus right ventricular stroke volume in a chronic animal model study: Improved results using C-scans for quantifying aortic regurgitation by Li, Xiaokui, Jones, Michael, Irvine, Timothy, Rusk, Rosemary A, Mori, Yoshiki, Hashimoto, Ikuo, Von Ramm, Olaf T, Li, Jun, Zetts, Arthur, Pemberton, James, Sahn, David J

“…The purpose of our study was to test the applicability of calculating the difference between left ventricular (LV) and right ventricular (RV) stroke volume…”
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Real-time, volumetric echocardiography: usefulness of volumetric scanning for the assessment of cardiac volume and function by Ota, T, Kisslo, J, von Ramm, O T, Yoshikawa, J

“…A novel imaging system has been introduced which uses a dedicated two-dimensional echo probe for rapid beam forming to scan a pyramidal volume in real time…”
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2-D arrays by von Ramm, O T

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Real-time three-dimensional echocardiography to construct clinically ready, load-independent indices of myocardial contractile performance by Atkins, B Zane, Kuo, Johnny, Shah, Ashish S, Hutcheson, Kelley A, Glower, Donald D, von Ramm, Olaf T

“…Real-time 3-dimensional echocardiography (RT3DE) reliably determines intracardiac chamber volumes without left ventricular (LV) geometric assumptions, yet…”
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Design and construction of an evanescent optical wave device for the recanalization of vessels by Hooper, Brett A, LaVerde, George C, Von Ramm, Olaf T

“…Removing atherosclerotic material without transecting the vessel wall is a common problem for vascular surgeons and interventional cardiologists. The goal of…”
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Quantification of aortic regurgitation by real-time 3-dimensional echocardiography in a chronic animal model: computation of aortic regurgitant volume as the difference between left and right ventricular stroke volumes by Irvine, T, Stetten, G D, Sachdev, V, Zetts, A D, Jones, M, Mori, Y, Ramsperger, C, Castellucci, J B, Kenny, A, Panza, J A, von Ramm, O T, Sahn, D J

“…The accuracy of conventional 2-dimensional echocardiographic and Doppler techniques for the quantification of valvular regurgitation remains controversial. In…”
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