Chapter 1 - About the Terason Ultrasound System
About Ultrasound Modes
Terason t3000 / Echo Ultrasound System User Guide
24
Example M-Mode Scan
For more information on using M-mode, see:
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Measuring in the M-Mode Window
When using a 4V2 transducer in a Cardiac exam, a special M-Mode feature is available.
See
Power Doppler
Conventional Power Doppler shows blood flow by displaying the density of red blood
cells, as opposed to their velocity. Large amplitude signals are assigned a bright hue, and
weak signals are assigned a dim hue. For example, the jugular vein is shown in brighter
colors than the carotid artery because the jugular vein contains more red blood cells at any
given time than does the carotid artery. All flows display in shades of the same color; no
directional information is provided. You also can choose to apply a high frame rate or high
resolution to control the quality of the scan.
In general, Power Doppler is more sensitive than Color Doppler. Amplitude estimation is
less noisy than a mean frequency estimate. Therefore, Power Doppler detects and displays
more real signal. Power Doppler is more sensitive to low flow than Color or Directional
Power Doppler. The increased sensitivity means that Power Doppler is less angle-
dependent than Color Doppler, and does not alias.
Power Doppler is the preferred mode to show perfusion and contour of vessel lumen.
The Power Doppler scan data displays in the 2D Image Display window as shown in the
following figure.