20
JB83797AU
4D tools
4D Feature
What it does
When to use and how
Frequency
of
adjustment
4D Gain
Affects the transparency of the volume
rendering.
Too much 4D Gain applied will take away
structures, too little will leave opaque “Gray
clouds” in the ventricle
As Necessary
4D Clarity
Edge preserving speckle and noise reduction
filter that reduces speckle while preserving or
even enhancing significant boundaries in the
volume data.
Increasing 4D Clarity will create images with
less visible speckle noise and with a softer
appearance.
AN
Angle
Sets the cut-planes and crop planes to pre-
defined positions.
Use to display different rendering views
–
can be used in 2d mode to angle through
different views without rotating the probe
AN
Auto
Automatically optimizes the brightness of the 4D
image.
Use for quick optimization of image
brightness
–
further manual adjustments
may be required to suit individual
preferences.
AN
Clear
Sets the cut-planes and crop planes to the
default position.
Use to return to zero
AN
DDP
Performs temporal processing which reduces
random noise without affecting the motion of
significant tissue structures.
Reduce if there is too much smoothness in
the image.
Rarely (once
set to
desired level)
Frame rate
Adjusts the frames per second of the system
–
adjusting means a trade of between spatial and
temporal resolution.
Use to avoid multibeat to get FR >13 for
LVQ
–
trade off with image resolution.
AN with
caution
Gamma
Adjusts the brightness of midtone values.
A higher gamma value produces an overall
darker image, a lower gamma value a
brighter image.
AN
HD live
Simulates light propagation and scattering
through tissue
Use for rendered images with realistic
looking soft shadows.
AN user
preference
Low velocity
reject (in 4D
Colour mode)
Removes low velocity blood flow and tissue
movement that reduces image quality.
Turn on during 4d colour acquisition to
improve
Rarely (leave
set to on)
Shading
Adjusts the shading effect on the volume
rendering
Use to improve three dimensional
perception.
Rarely
Smoothness
Affects continuity of structures and image noise
in the volume rendering.
Too much smoothness will blur the image,
too little will leave too much noise.
Rarely once
set
Translate
Translates the crop plane into the volume.
Adjust to move closer to structure of
interest and improve appearance of 4D
image.
Frequently
Colour
Transparency
(4D colour)
Adjusts the display transparency of color data.
An increase of Color Transparency may help
bring out relevant color flow information
(e.g. jet).
AN
Tissue
Transparency
(4D, 4D colour)
Adjusts the display transparency of tissue data.
An increase of Tissue Transparency may
help bring out tissue structures or flow
information behind obscuring tissue
structures.
AN
