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Doppler ultrasound is a non-invasive technique for velocity measurements of blood flow. Johann Christian Doppler (1803-0853) was the first to describe the frequency shift effect that occurs when sound or light is emitted from a moving source and the Doppler effect now bears his name. To measure blood velocity using Doppler effect, ultrasound is transmitted into a vessel and the echo reflecting from the blood is detected. Generally, medical ultrasound operating in the 2-12 MHz range is one of the most widely used modalities for soft tissue imaging and large vessel blood flow assessment (Jensen 1996). |
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Using Microbubbles for Improving Sensitivity in Molecular Imaging |
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Doppler Effect |
