EDAN Acclarix AX4, Руководство пользователя

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Acclarix AX4 Diagnostic Ultrasound System User Manual Imaging
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Image Type
Color Doppler supports image presets for Low Flow, Medium
Flow, and High Flow.
Dual Live
To activate split screen with simultaneous live B/Color and live
B. the live B image without color and the same live B image with
color are simultaneously displayed on each side of the image
field.
Freezing the image will freeze both sides simultaneously.
Cine review will review both sides simultaneously.
Dynamic
Range
The Dynamic Range, or log compression, adjusts how echo
intensities are converted to brightness. A high dynamic range
presents a flatter, less contrasty color display, while a low
dynamic range presents a more contrasty color display. Only
available in PDI/DPDI mode.
Frame rate
Adjusts the tradeoff between frame rate and lateral resolution.
Higher settings provide higher frame rates and improved
temporal resolution. Lower settings provide better lateral
resolution, but with lower frame rates.
Acoustic
power Adjusts the acoustic output power of the activated transducer. It
is only available in live imaging. Higher acoustic power numbers
correspond to increased color sensitivity and penetration, but
the ALARA principle should be followed in actual clinical
situations.
Auto
Optimization The Auto push button automatically updates the gain and
scale. Each single press of the button renews the automatic
optimization.
It is not available in TDI mode.
Table 5-5 Color Mode Touch Screen Controls
5.4.2. Color Mode Variants
The system supports 4 types of Color Doppler imaging:

Color (Color Doppler): This is velocity Color Doppler that shows direction and velocity
of flow. Different colors represent different velocities and positive flow has different
colors than negative flow.

PDI (Power Doppler Imaging): PDI shows the power, or intensity, of the Doppler signal.
PDI is typically more sensitive to low levels of flow, but cannot distinguish the velocity or
direction of the flow.

DPDI (Directional Power Doppler Imaging): This is similar to DPI in that it shows the
power of the Doppler signal instead of the velocity. However, it does map positive flow to
different colors than negative flow.

TDI (Tissue Doppler Imaging): TDI shows information about low-velocity and
high-amplitude tissue motion, usually used to evaluate cardiac tissue motion (see section
5.7 for details).