منابع مشابه
Rapid quantitation of high-speed flow jets.
Flow jets containing velocities up to 5-7 m/s are common in patients with congenital defects and patients with valvular disease (stenosis and regurgitation). The quantitation of peak velocity and flow volume in these jets is clinically significant but requires specialized imaging sequences. Conventional 2DFT phase contrast sequences require lengthy acquisitions on the order of several minutes. ...
متن کاملImaging High-Speed Jets Using Rapid Ungated Fourier Velocity Encoding
Introduction: Accurate quantitation of the peak arterial jet velocity is crucial in assessing the severity of cardiovascular disease. The current “gold standard”, Doppler ultrasound, is highly sensitive to beam position and Doppler angle. Fourier velocity encoding (FVE) resolves the full velocity spectrum [1], but conventional gated methods [2-4] do not work well during arrhythmia and require l...
متن کاملHigh-Speed Internal Nozzle Flow Visualization of Flashing Jets
Flashing or thermodynamic breakup of a liquid jets occurs when a pressurized, subcooled or saturated liquid is released to a lower pressure, resulting in violent vapor nucleation, expansion, and breakup of the liquid phase. Flashing is known to produce very fine droplet atomization, often not possible by other means. Despite its usefulness as an atomization method, the fundamental processes inv...
متن کاملComputation of High-Speed Coaxial Jets with Fan Flow Deflection
We present a computational study, validated by mean-flow experiments, of a dual-stream nozzle simulating the exit conditions of a supersonic turbofan engine with noise-suppressing fan flow deflectors. The study is conducted for eight nozzle configurations and two operating conditions: a cold condition at which mean velocity surveys were conducted and against which the computational code was val...
متن کاملBeamformed Flow-Acoustic Correlations in High-Speed Jets
An experimental study of simultaneous multi-point measurements in the flow and acoustic fields of a Mach 1.75 cold air jet is presented. A series of four optical deflectometer (OD) probes were used for the flow field measurements, and eight microphones arranged on a circular arc recorded the far-field pressure in the direction of peak emission. In addition, some of the OD probes were positioned...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2003
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.10538