Corrections By The User - Leica GLOW800 User Manual

Observation
The flow signal is low/dark, invisible or noisy

13.4 Corrections by the user

Observation
Neither a sharp GLOW800 nor a sharp White Light
image on the monitor
The flow signal is overexposed
The flow signal is oversaturated or too dominant There is no more transparency in the signal and
The flow signal is low
The flow signal is too pale
The GLOW800 image is not bright enough
The GLOW800 image displays high intensive
fluorescence only. Low intensity fluorescence and
flow signal in fine vessels are missing
Low fluorescence covers huge portions of the
image
Cause
The fluorescence signal is very low due to high
magnification and/or the working distance
The illumination bulb efficiency is low and needs
replacement or the illumination system is out of
specification (low light transmission by the fiber
light guide or illumination beam path)
Cause
The diopter settings of the surgeon's eyepiece are
incorrect and you work off parfocality
Fine vessels and perfusion show up too bright.
Possibly the ICG concentration of the bolus is too
high
the signal seems to be flat. The GLOW "intensity"
is possibly too high
The fluorescence is faint, the flow in fine vessels
is not indicated. The ICG concentration might be
too low
The GLOW "Intensity" is too low
In lower WDs and high magnification BrightCare
will reduce the illumination/excitation for
GLOW800.
The lower threshold level is set too high
External NIR radiation is detected and displayed
A fluorescence signal is reflected by surrounding
tissue
Remaining ICG shows low fluorescence
GLOW800 / Ref. 10 748 652 / Version 01
Remedy
Make sure the GLOW800 Illumination/
X
excitation is set to 100 %, reduce the
magnification and/or increase the ICG dose if
possible.
With an ICG dosage of 12.5 mg/75 kg the
GLOW800 will generate fluorescence images with
good visibility even at higher magnifications or
working distances.
Check the illumination bulb lifetime and the
X
illumination system.
Call the Leica Service for professional
X
investigation when needed.
Remedy
Adjust the WD to receive a sharp video image
X
and adjust the diopters correctly.
Reduce the ICG dosage to 12.5 mg/75 kg and/
X
or reduce GLOW Brightness (Illumination/
Excitation intensity) down to 50 %.
Reduce the GLOW "Intensity" to the normal
X
value of 50 % or less.
If possible increase the ICG dosage.
X
Increase the GLOW "Intensity", standard is
X
50 %.
Deactivate BrightCare Plus for GLOW800 to
X
get maximum excitation intensity.
Reduce the lower threshold level to ≤8 % to
X
display the full range of fluorescence
intensity.
Switch the external light source off, which
X
produces NIR radiation in the GLOW800
detected spectral range and/or increase the
lower threshold to 8 %.
Increase the lower threshold to 8 %–12 %.
X
Increase the lower threshold to 8 %–12 %.
X
What to do if...?
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