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Knowledge Point

Color Doppler flow imaging

Color Doppler flow imaging system can simultaneously display B-type image and Doppler blood flow data (blood flow direction, flow velocity, flow dispersion) of dual ultrasound scanning system. Color power angio(CPA) detected the backscattered energy of blood cells in the blood flow, which did not distinguish the flow direction, and had nothing to do with the angle θ (the angle between the direction of sound wave and the direction of blood flow). CPA can improve the sensitivity of blood flow detection, especially suitable for displaying low-speed blood flow of small vessels, but can not show the direction of blood flow.

Harmonic imaging

Harmonic imaging exploits non-linear propagation of ultrasound through the body tissues. When the frequency of emitted sound wave is f 0, the frequency of echo (due to reflection or scattering) includes f 0 (called fundamental wave), 2f 0, 3F 0 and so on The second harmonic (2f 0) has the largest energy.

Ultrasonic harmonic imaging (UHI) is based on the information of human body carried by the second harmonic in echo (reflection or scattering). Harmonic imaging without UCA is called native harmonic imaging or tissue harmonic imaging. Harmonic imaging using UCA (ultrasound contrast agent) is called contrast harmonic imaging.