Samsung MySono U5 Uživatelský manuál Strana 123

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Chapter 4 Diagnosis Modes
4-23
Entering and Exiting PW Spectral Doppler Mode
Press the PW button. Press it again to return to 2D Mode.
Press the Update button on the control panel to obtain a spectral Doppler image.
PW Spectral Doppler Mode Screen
Sample Volume
When Sample Volume is positioned over the blood ow in a 2D image, the Doppler Spectrum is
displayed. Information on the size and depth of Sample Volume is displayed in [mm] units. Use the
trackball to move the Sample Volume position. The position is displayed in the xx.xx@yy.yy format.
This means that a Sample Volume of size xx.xx mm is located yy.yy mm deep.
For example, [email protected] means that a Sample Volume of size 2.00 mm is located 16.07 mm deep.
X Moving Sample Volume: Use the trackball.
X Resizing Sample Volume: Press the Change button and then use the trackball to resize. Press
the Change button again to move the position. The icon showing the two trackball functions
(SV Pos/SV Size) is shown for a second and disappears.
X Adjusting Sample Volume Angle: Use the Angle dial-button on the control panel or Angle (10
Steps) or Angle (60 Steps) in the soft menu. Using the Angle dial-button on the control panel
allows you to adjust the angle to between -70 and +70. Adjusting the Sample Volume angle
allows you to measure the speed more accurately.
Adjusting Doppler Baseline
Use Baseline in the soft menu. Turn the dial-button clockwise to raise the baseline.
HPRF Function
This function measures blood ow for which the speed exceeds specied limits at a specied depth.
This doubles the current scale. It is available only in PW Spectral Doppler Mode (D Only). HPRF
stands for High Pulse Repetition Frequency.
X 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.
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