Appendix A Technical Description
A - 8 Instructions for Use
Pulsed Wave Doppler Features
 Doppler measurements and calculations available for all linear, curved, and phased array
transducers
 Fast Fourier Transformation (FFT) processing of 32 to 256 points
 FFT speed up to 1,920 FFTs per second at the highest sweep speed
 Up to four user-selectable transmit frequencies per transducer
 Simultaneous 2D-mode and Doppler display and 2D/Doppler with color (Triplex)
 User-selectable Doppler update mode
 User-adjustable Doppler scale and position controls
 Angle correction of 0° to 89° in one degree increments
 Transmit frequencies of 2 to 7.5 MHz
 Downshift frequency and high-PRF Doppler
 Doppler grayscale and colorization (tint) maps
 Spectral invert
 User-selectable frequency (kHz) or velocity (m/s) display format
 Wall filter selections: 20 Hz to 1,600 Hz
 Adjustable Doppler Gate size from 0.1 cm up to 4.0 cm, depending on the transducer
 Flow angle correction on real-time or frozen images, with velocity readout update
 PRF range from 100 Hz to 52,000 Hz
 Doppler signal processing that enables automatic calculation of waveform statistics during
real-time imaging
 Derived waveform Doppler trace function analyzes frozen Doppler spectrum for mean and
maximum velocity information. Waveform may be set to trace above baseline, below
baseline, or both.
 Doppler audio output while in Doppler cursor mode
 Doppler CINE control feature — up to 30 seconds of Doppler data can be stored
 Five sweep speed selections
 Gain of 0 dB to 90 dB in one decibel increments
Steerable Continuous Wave Doppler
 Steerable continuous wave Doppler for phased array transducers
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