Cine magnetic resonance imaging and color Doppler flow mapping displays of flow velocity, spatial acceleration, and jet formation: a comparative in vitro study
| Autor: | Robin Shandas, Iain A. Simpson, Benedito Carlos Maciel, Valdir Ambrósio Moisés, Kyung J. Chung, Lilliam M. Valdes-Cruz, John R. Hesselink, David J. Sahn, William Elias |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Heart Valve Diseases
Tapering Physics::Fluid Dynamics Acceleration Nuclear magnetic resonance Medicine Humans Jet (fluid) business.industry Turbulence Spatial acceleration Models Cardiovascular Laminar flow equipment and supplies Magnetic Resonance Imaging Echocardiography Doppler Flow velocity Regional Blood Flow Pulsatile Flow Linear Models Cardiology and Cardiovascular Medicine Nuclear medicine business Rheology human activities Body orifice Blood Flow Velocity circulatory and respiratory physiology |
| Zdroj: | American heart journal. 126(5) |
| ISSN: | 0002-8703 |
| Popis: | To study the effects of flow acceleration and high-velocity jets on the display characteristics of cine magnetic resonance imaging compared with color Doppler flow mapping, a custom-designed in vitro flow model was developed. This model consisted of a funnel segment tapering to an orifice (0.78 cm2) that leads into a confined receiving chamber with a second, discrete orifice (0.78 cm2) at its distal end. Cine magnetic resonance images obtained at varying flow rates (1.5 to 27.2 L/min) demonstrated loss of signal intensity throughout the tapering zone of spatial acceleration and a small zone of more marked signal loss immediately proximal to the second orifice (always |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|