M–Mode
LOGIQ 500 Basic Users Manual
2233658–100 Rev. 0
5–68
M-Mode Sub-Menu Page 1
48
Preset
M
Edge
Enhance
Rejectn
Gray
Map
Dynamic
Range
Set Up
ECG
M–2
40
MID
Figure 5–30. M-Mode Sub-Menu Page 1
Dynamic Range
Gray Scale Mapping (Gray Map)
Description
Controls how echo intensities are
converted to shades of gray, thereby
creating a range of gray scale that can be
adjusted. Adjustments to M-Mode’s
dynamic range affects the M-Mode
timeline only.
Gray scale mapping determines how the
echo intensity levels received are
presented as shades of gray.
Benefits
Dynamic range is useful for optimizing
tissue texture to differentiate between
echo levels that are close together.
Dynamic range should be adjusted so that
the highest amplitude edges appear as
white while lowest levels (such as blood)
are just visible.
Displays the received echo levels with
different weights on specific levels of gray.
For example, a certain gray map may
enhance mid level echoes over a wider
range of grays verses high or low level
echoes.
Allows for better differentiation between
echo levels through gray levels displayed.
Values
The settings cycle in 6 dB steps from
30 dB to 90 dB. The default for M dynamic
range is set in the Set Up/Custom Display
menu page 3. Dynamic range levels are
returned to the preset value when
changing the following:
S
Probe
S
Exam category
S
New patient
Pre-processing function.
There are 6 selections of gray scale
mapping.
Post-processing function.
Affects on
Other Controls
Operates only in real-time, not in freeze,
Cine, Timeline replay, or VCR playback.