GE Vivid S70, User Manual

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Image Optimization
5-52
Vivid S70 / S60
–
User Manual
BC092760-1EN 01
UD Speckle reduce
2D (non-Cardiac) Reduces the unwanted effects of speckle in the ultrasound image. Image speckle
usually appears as a grainy texture in otherwise uniform areas of tissue. Its
appearance is related to image system characteristics, rather than tissue
characteristics, so that changes in system settings, such as probe type, frequency,
depth, and others, can change the appearance of the speckle. Too much speckle
can impair image quality and make it difficult to see the desired detail in the image.
Likewise, too much filtering of speckle can mask or obscure desired image detail.
Extra care must be taken to select the optimal Speckle reduction level.
Virtual Apex
2D (Cardiac) Improves near field imaging, allowing increased visibility up to the width of the full
probe aperture close to the surface.
Virtual Convex
2D, CF, Doppler Virtual Convex extends the field of view for linear probes. Enable/disable
independently for each mode.
Compound
2D Combines three or five frames from different steering angles into a single frame,
reducing speckle noise and clutter, and providing continuity of specular reflectors.
Edge Enhance
2D, M-Mode
(non-cardiac) Controls image processing related to the extent of edge enhancement applied to
an image.
PRF
2D Affects the level of reverberations in the image. When turned on, the frame rate (or
the number of focal zones) will decrease, while the reverberations will be
attenuated.
Power
2D, M-Mode, CF,
Doppler, TVI, TT,
SRI, SI, TSI Controls the amount of acoustic power applied in all modes. When power is set to
maximum, it is equal to or less than the maximum acoustic power permitted by the
FDA. The Thermal Index (TI) and the Mechanical Index (MI) are displayed on the
screen.
When power is reduced, it reduces the signal-to-noise ratio, so that the image may
become noisier.
Horizontal sweep
M-Mode, Doppler Adjusts the horizontal refresh rate of the M-Mode or Doppler area of the display.
Horizontal sweep is available in live and cine replay.