Both the laser Doppler and the phase Doppler techniques enjoyed immediate acceptance after their introduction within the fluid mechanic’s community for the study of single and multi-phase flows.
The Doppler effect (or the Doppler shift) is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler , who described the phenomenon in 1842.. A common example of Doppler shift is the change of pitch heard when a vehicle sounding a horn approaches and recedes from an observer.
As one of the most frequently used imaging technique Doppler Ultrasound ( DU ) of the renal IRA and DWA of these vessels shows no diagnostic advantage as compared to the renal CU in pregnancy complicated with PE. Keywords: preeclampsia, pregnancy, vasoconstriction, Conventional and Doppler .
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