Transcutaneous Interruption of Ultrasound Contrast Agents for Blood Flow Evaluation
| Autor: | J. A. Ivey, Paul L. Carson, Richard T. Rhee, D.W. Sirkin, E. A. Gardner, J. M. Rubin, J.B. Fowlkes |
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| Rok vydání: | 1998 |
| Předmět: |
medicine.medical_specialty
Time Factors Contrast Media Internal medicine medicine Animals Radiology Nuclear Medicine and imaging Ultrasonography Doppler Color Infusions Intravenous Drug Carriers Fluorocarbons business.industry Carcinoma Ultrasound Neoplasms Experimental General Medicine Blood flow Femoral Artery Thigh Regional Blood Flow Rapid rise Liposomes Cardiology Female Rabbits Radiology Ultrasonography business Perfusion Software |
| Zdroj: | Investigative Radiology. 33:893-901 |
| ISSN: | 0020-9996 |
| Popis: | The ability to create short boluses in targeted arteries with rapid rise times is limited by the transport of bubbles from the venous to arterial portion of the circulation. Acoustic interruption of contrast agent in arteries may create the short boluses necessary for simple wash-in/wash-out measures of blood flow.An ultrasound contrast agent was used with spectral Doppler ultrasound to observe contrast interruption in femoral arteries and VX2 carcinoma in a rabbit model. At an upstream location in the femoral artery, single, sinusoidal ultrasound tone bursts at 1.8 MHz with durations of 0.25 to 1 seconds were applied to interrupt the flow of contrast agent injected intravenously.In VX2 carcinoma, bursts as short as 40 cycles produced contrast interruption lasting only one cardiac cycle within the tumor periphery and I(SPPA)3 W/cm2 produced measurable interruptions.Acoustic fields applied transcutaneously interrupted flow of contrast agents to form temporally short negative boluses. |
| Databáze: | OpenAIRE |
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