Youkey D8 - B Mode Image Optimization

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4.3.2 B mode image optimization
Gain
Resume
The total gain of the image in the two-dimensional mode ，displays in real time on the
image parameter area on the left side of the screen.
Effect
By increasing the brightness of the gain image, more echo signals can be observed, but
at the same time, there will be more noise.。
Depth
Resume
For adjusting the depth of the image display, the range of image depth can be
adjusted by different probes. The depth value is displayed in the image parameter
area on the left side of the screen in real time.
Effect
The deeper the depth, the wider the observed tissue; the smaller the depth, the
shallower the observed tissue. When the depth increases, the frame rate decreases.
TGC
Resume
The attenuation caused by increasing tissue depth is compensated and the depth
gain is adjusted in different segments .
Effect
By adjusting the signal gain in a specific depth range, the echo of the tissue image
is uniform.
Frequency
Resume
The emission frequency of the probe can be selected by fundamental frequency or
harmonic frequency.
The frequency value is displayed in real time on the image parameter area on the left
side of the screen. There are three frequency modes in the fundamental wave or the
harmonic wave: "penetrating power", "conventional", and "resolution".
Effect
The higher the frequency, the better the near-field resolution, but the penetration
force decreases.
Harmonics can enhance the near-field resolution and reduce the noise with low
frequency and large amplitude.
Persistence
Resume
Improve the image quality by superposition of adjoin images.
Effect
Better image quality, may loss details of the image.
Dynamic range
Resume
Adjust the contrast of black-and-white images, compress or expand the gray-scale
display range.