After viewing this presentation, the participant will be able to: describe Doppler physics principles and factors affecting the qualitative and quantitative assessment of blood flow; explain how to optimize systems controls for accurate blood flow evaluation using spectral and color Doppler instrumentation; discuss the advantages and disadvantages of pulsed wave and continuous Doppler instrumentation; describe color and power Doppler instrumentation, and list the specific clinical applications for each; Demonstrate commonly seen artifacts associated with spectral Doppler, color Doppler, and Doppler imaging.