Shenzhen Mindray Bio-Medical Electronics Co., Ltd. DC-N2, Руководство оператора

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5-18 Image Optimization
4. Press <PW> again or <Update> to enter PW mode and perform the examination. You can
also adjust the SV size, angle and depth in real-time scanning.
5. Adjust the image parameters during PW mode scanning to obtain optimized image.
6. Perform other operations (e.g. measurement and calculation) if necessary.
5.8.2 PW Mode Image Parameters
In PW mode scanning, the image parameter area in the upper right corner of the screen
displays the real-time parameter values as follows:
Parameter F G PRF WF SVD SV Angle
Meaning Frequency Gain PRF Wall Filter SV Position SV Size Angle
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When you adjust the depth of the B mode image, related changes will occur in PW mode
image as well.
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During PW mode imaging, you can switch between B and PW menu from the menu title;
for details, please refer to “5.1 Switching Among Imaging Modes” chapter.
5.8.3 PW Mode Image Optimization
Gain
Description This function is intended to adjust the gain of spectrum map. The real-time
gain value is displayed in the image parameter area in the upper right corner
of the screen.
Operations Rotate the [Gain/iTouch] knob to adjust the gain.
The adjusting range is 0-100.
Effects Increasing the gain will brighten the image and you can see more received
signals. However, noise may also be increased.
Frequency
Description Refers to the operating frequency in PW mode of the probe, the real-time value
of which is displayed in the image parameter area in the upper left corner of
the screen.
Operation Select the frequency value through the [Frequency] item in the image menu or
rotate the <Focus/Freq./THI> knob on the control panel.
Values of frequency vary depending upon the probe types.
Select the frequency according to the detection depth and current tissue
characteristics.
Effects The higher the frequency, the better the resolution and sensitivity, and the
worse the force of penetration.
Baseline
Description Refers to the area where the velocity is zero in the spectrum.
Operations Press the <Baseline> key on the control panel (the <Baseline> key backlight is
on) and rotate the Multifunctional Knob on the right to adjust.
Effects To change the range of flow velocity to optimize the image.
PW Steer
Description This function provides adjustment on angles for sampling line.