Color Mode Variants; M-Mode; M-Mode Touch Screen Controls - EDAN Acclarix LX4 User Manual

Acclarix LX4 Diagnostic Ultrasound System User Manual
Dynamic
Range
Frame
rate
Acoustic
power

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).

5.5 M-mode

5.5.1. M-mode Touch Screen Controls

The following touch screen controls impact the M-mode image. The location of the touchscreen
controls can be customized (see section 3.7 for details).
Name Control
Colorize
Gray Map
Tint
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.
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.
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.
Table 5-5 Color Mode Touch Screen Controls
Description
Switches between grayscale and colorized (pseudo-color)
postprocessing maps.
Adjusts the current postprocessing, either grayscale or tinted.
- 53 -
Imaging