RIU 320 Lecture Notes - Lecture 65: Medical Ultrasound, Angiography, Frame Rate
17 Jun 2020
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Document Summary
Doppler packets, with color doppler, multiple ultrasound pulses are used, packers composed of a larger number of pulses ( larger to accurately determine blood velocities. Power doppler: packet size should be carefully selected to balance two competing interests of color doppler: accurate velocity measurements and adequate temporal resolution, power mode only identifies the presence of a doppler shift. Power mode is non-directional color doppler: in the power doppler image, all vessels have the same color, regardless of the direction of blood flow. The image is similar to a doppler angiogram: power doppler is also called energy mode or color angio, more traditional forms of doppler, such as pulsed, continuous, or color, process velocity information. In power mode, the strength (amplitude) of the reflected signal is processed without regard to the blood"s direction or speed. Doppler artifacts: ghosting and clutter, doppler shifts generally arise from moving blood.
