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

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5-16 Image Optimization
5.7 Power Mode Image Optimization
Power mode provides a non-directional display of blood flow in the form of intensity as
opposed to flow velocity.
DirPower (Directional Power mode) provides additional information of flow direction towards
or away from the probe.
NOTE: Power imaging is an option.
5.7.1 Basic Procedures for Power Mode Imaging
1. Select a high-quality image during B + Color scanning, and adjust to place the area of
interest in the center of the image.
2. Click [Power Mode] on image menu to enter B + Power mode. Roll the trackball to
change position of the Region of Interest (ROI) and press the <Set> key to set. Roll the
trackball to change the size and position of ROI.
3. Adjust the image parameters during B + Power mode scanning to obtain optimized image.
4. Perform other operations (e.g. measurement and calculation) if necessary.
5.7.2 Power Mode Image Parameters
„
In Power 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
Meaning Frequency Power Gain Pulse Repetition
Frequency (PRF) Power Wall Filter
„
In Power mode, acoustic power is synchronous with that of B mode. Adjustment of the
depth to the B mode image will lead to corresponding changes in Power mode image.
„
During Power mode imaging, you can switch between B and Power menu from the menu
title; for details, please refer to “5.1 Switching Among Imaging Modes” chapter.
Parameters consistent with those in Color mode and B mode are not to be introduced, please
refer to relevant sections of the Color mode and B mode, while special items of the Power
mode are introduced in the following.
5.7.3 Power Mode Image Optimization
Power Gain
Description Refers to the overall sensitivity to flow signals, and this function is used to
adjust the gain in Power mode.
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 increase the flow signal presented as well as noise,
while the signals may be missing when the gain is adjusted too low.