6 Image Acquisition
Operator’s Manual 6 - 15
HPRF
HPRF mode is used when detected velocities exceed the processing capabilities of the currently
selected PW Doppler scale or when the selected anatomical site is too deep for the selective PW
Doppler scale.
Baseline
Refers to the area where the velocity in zero in the spectrum. The map changes after being edited.
Angle
This function is used to adjust the angle between Doppler vector and flow to make the velocity
more accurate.
The real-time adjusting angle value is displayed in the image parameter area.
Quick Angle
Adjusts the angle faster in increments of 60°, and the real-time value of which is displayed in the
image parameter area.
Dynamic Range
The dynamic range conveys the information that being transformed from echo intensity to gray
scale.
Audio
Adjusts the output audio in spectrum Doppler.
PW Steering
This function is used to adjust the angles for the sampling line. The PW Steer function is available
only for linear probes.
Invert
To set the display mode of the color flow. The color scale will be inverted when the function is
turned on.
Auto Invert
To set the display mode of the color flow. The color bar can automatically invert when the color
flow is steered to a certain angle to accommodate operators’ habit of distinguishing flow direction.
6.8 TDI
TDI mode is intended to provide information of low-velocity and high-amplitude tissue motion,
specifically for cardiac movement.
There are the following types of TDI mode available:
• Tissue Velocity Imaging (TVI): This imaging mode is used to detect tissue movement with
direction and speed information. Generally the warm color indicates the movement towards
the transducer, while the cool color indicates the movement away from the transducer.
• Tissue Energy Imaging (TEI): This imaging mode reflects the status of cardiac movement by
providing the energy information, the larger the energy is, the brighter the color becomes.
• Tissue Velocity Doppler Mode (TVD): This imaging mode provides direction and speed
information of the tissue.
• Tissue Velocity M Mode (TVM): This function assists to observe the cardiac motion through a
direct angle.
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