VDO MG 2100 Specifiche Pagina 249

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Rev 1.1 VisualSonics Vevo 2100 Imaging System Operator Manual 249
Chapter 37: Acquiring PW Doppler Mode and PW Tissue Doppler Mode images
Area Description
Blockout zones. In PW Doppler Mode, the system processes reliable ultrasound signals it
receives from just beyond the face of the transducer and extending until the distance is too
far to produce reliable data.
The surface blockout zone is the very small distance just beyond the transducer face. The
distance blockout zone is the region beyond the sample zone where the system does not
sufficiently process the signal data.
The system assigns a blue bar to these zones, as shown in the following diagram.
Surface blockout zone
Distance blockout zone
If you set the sample volume in a blockout zone the system will move it out of the
blockout zone and as close as possible to your target location.
Sample volume. This region of interest is the image data that the transducer acquires
along the vertical line between the brackets of the yellow wireframe in the B-Mode image.
Scout window B-Mode sample gate. Displays a smaller scale version of the complete
B-Mode image, along with the volume brackets. If you want to change the relative size of
the scout window and the spectrum data, see the Mode Screen Layout section in the
General tab of the Preferences window.
PW Doppler Mode data. Displays the spectral display of the velocity data.
Scale indicator. Indicates the velocity of blood flow. You can set it to Velocity or
Frequency in the General tab of the Preferences window.
Region of interest image window. Displays the sample volume image data that is
defined in the B-Mode scout window above. The most current data begins at the right side
of the window. The trailing data in the cine loop acquisition buffer extends to the left.
Baseline. The horizontal zero line that divides the spectral display into positive velocities
(flow moving toward the transducer) and negative velocities (flow moving away from the
transducer).
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