
User Manual
4-22
■
Sample Volume
When Sample Volume is positioned over the blood flow in a 2D image, the Doppler Spectrum is
displayed. Information on the size and depth of Sample Volume is displayed in [mm] units. The position
is displayed in the
‘
[email protected] mm
’
format.
This means that a Sample V
olume of size
‘xx.x mm
’
is located
‘yy.
y mm
’
deep. F
or example,
‘
[email protected]’
means that a Sample V
olume of size 2.0 mm is located 16.7 mm
deep.
Use the Change button to adjust the position and the size of the Sample Volume. Each time you press
the Change button, the current status of the Sample Volume will be displayed on the lower left side of
the screen.
▶
SV Pos.: You can change the position of the Sample Volume. Use the trackball to move the Sample
Volume position.
▶
SV Size: You can change the size of the Sample Volume. Use the trackball to resize the Sample
Volume and press the Set button.
■
HPRF
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 (PW Only). HPRF stands for High Pulse Repetition Frequency.
NOTE: To use HPRF function, select ‘On’ in the Seup > System > Display tab.
▶
Running HPRF
If you keep increasing the scale value at a certain depth, HPRF will be activated. The Phantom Gate
will appear on the D Line at a position above the Sample Volume. Once HPRF starts, PRF does not
increase even if you increase the scale value.
▶
Exiting HPRF
While HPRF is in use, decrease the scale value by one step to exit HPRF. The PRF value at this point
will be the maximum value in PW Spectral Doppler Mode.
▶
Moving Sample Volume
If you move the Sample Volume in the D Only state, the system will calculate the PRF value and the
Phantom Gate position and update the information on the spectral Doppler image accordingly. If
you cannot activate HRPF, exit HPRF rst.
If you move the Sample Volume in 2D Only state, the PRF value will remain unchanged.
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