VDO MG 2100 Specifiche Pagina 255

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Rev 1.1 VisualSonics Vevo 2100 Imaging System Operator Manual 255
Chapter 37: Acquiring PW Doppler Mode and PW Tissue Doppler Mode images
SV/Gate
Push up to increase. Pull back to decrease.
In PW Doppler Mode: This control adjusts the distance in mm of the vertical line
between the two yellow calipers of the sample volume.
In the dual window view, the system displays the spectral data that the system acquires
along this line. Current data is on the right side, trailing data extends to the left.
Doppler Angle
Adjusts the angle correction in 5-degree increments between the vertical line of the
ultrasound pulse from the face of the transducer and the direction of vascular flow in the
sample volume in a PW Doppler Mode image acquisition session. The dashed yellow
line indicates the direction of flow.
When the system receives the return signal, it applies an algorithm to the signal data to
correct for the delta. This produces usable PW Doppler Mode data.
To use this dial control:
1. Turn the dial to align the dashed yellow line with the direction of the vascular flow in
your sample volume region.
The system always displays the value of the resulting angle as a positive value
between 0 degrees and 80 degrees, regardless of which side of the vertical line you
align the dashed line.
For angles between 60 degrees and 80 degrees, the system applies the color blue to
the dashed line. This indicates that the angle is too great to correct.
2. Reposition your transducer and/or the animal to bring the angle of the vessel as
parallel as you can to the vertical yellow line that represents the transducer beam.
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