Spectral Doppler - Video Lesson

Hey, everybody. Welcome to today's lesson on Doppler ultrasound. Doppler ultrasound is a critical tool in sonographic imaging, allowing the evaluation of blood flow characteristics. This lesson focuses on spectral wave Doppler as well as the impact of bidirectional Doppler and the differences between the various modalities of Doppler ultrasound imaging. Most common Doppler ultrasound systems are bidirectional, which means that the system can distinguish between blood flow moving toward or away from the transducer. Remember, Doppler ultrasound is based on Doppler shift, which is the change in frequency of a sound wave as it interacts with a moving object like red blood cells. If blood cells are moving towards the transducer, it is a positive Doppler shift because the reflected frequency is higher than the transmitted frequency. If blood cells are moving away from the transducer, it is a negative Doppler shift because the reflected frequency is lower than the transmitted frequency. Two primary types of Doppler imaging used in clinical