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Chapter 4 Diagnosis Modes
PW Spectral Doppler Mode Screen
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Sample Volume
When Sample Volume is on the blood ow of the 2D image, it represents Doppler Spectrum. The size
and depth of Sample volume is displayed in [mm] units. Its position is moved with the Trackball and
displayed in the xx.xx@yy.yy mm format. The format means that a Sample Volume of ‘xx.xx’ mm size is
located at a depth of ‘yy.yy’ mm.
F
or example,
[email protected] mm means that a Sample
V
olume of 2.00mm size is located at a depth of
16.07mm.
▶
Moving Sample Volume: Use the Trackball on the control panel.
▶
Resizing Sample Volume: Adjust the Sample Volume size by pressing the Change button and
using the Trackball on the control panel. Press the Change button again to return to the Sample
Volume Position Control screen. The icon showing the two Trackball functions (SV Position/SV Size)
is shown for a second and then disappears.
▶
Adjusting the angle of Sample Volume: Use the Menu dial-button on the control panel. If you
rotate the dial-button clockwise, the angle increases from between –70 ~ +70.
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HPRF (High PRF) Function
This function measures blood ow for which the speed exceeds the specied limit at a specied depth.
It expands the scale into double the size of the original scale. This function is available only in PW
Spectral Doppler Mode (D Only).
▶
Activating HPRF
To activate HPRF, increase the Scale values at the required depth. A The Phantom Gate will appear
on the D Line at a position higher than the sample volume. Once HPRF starts, PRF does not
increase even if you increase the scale value.
▶
Finishing HPRF
While HPRF is in use, decrease the scale value by one step to nish HPRF. The maximum PRF values
in PW Spectral Doppler Mode are shown.
▶
Moving Sample Volume
To move the Sample Volume position in the D Only state, the system calculates PRF values and the
Phantom Gate position, and updates them on the PW Spectral Doppler image. HPRF is terminated
when HPRF cannot be activated.
When Sample Volume is moved in the 2D Only state, the PRF values don’t change.
I want to learn how to do angle correction on PW Doppler on my machine.
How do I assess PW angle cursor?
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