Abstract
The spectral Doppler power waveform contains an immense amount of hemodynamic information from the sampled circulation. As we saw in Chap. 3, the spectral information consists of three fundamental variables: frequency, amplitude, and time. Spectral frequency reflects the speed of blood flow. The amplitude approximately represents the number of scatterers traveling at a given speed and is also known as the power of the spectrum. Amplitude depends on the quantity of moving red blood cells (RBCs) in the sample and therefore reflects the volume of blood flow. The time over which the frequency and amplitude of the Doppler spectrum is therefore three-dimensional (see Chap. 3). Such a display is complex, however, and not particularly useful for clinical application. Fortunately, there are alternative approaches for effectively characterizing the spectral waveform, including two-dimensional sonograms and various frequency envelope waveforms. These approaches can be utilized to evaluate various aspects of hemodynamics of flow to downstream impedance. This chapter discusses these subjects and other related issues.
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Maulik, D. (2005). Spectral Doppler Sonography: Waveform Analysis and Hemodynamic Interpretation. In: Maulik, D. (eds) Doppler Ultrasound in Obstetrics and Gynecology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28903-8_4
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DOI: https://doi.org/10.1007/3-540-28903-8_4
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