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 | No Kr81m gas seen by the camera |
Check for air flow with the bubble test
Poor Flow
There may be a loose connection. Check all connections
for a tight fit
The wrong tubing may be used. One type of tubing has a
rippled interior finish which leaks. Make sure the tubing is smooth bore.
If a filter is used in the output line check that this is
not blocked or wetted. A wet filter can obstruct the air flow
The generator may be
blocked (eg a displaced O-ring seal). Visually check any seals if possible. Take care not
to tamper with the generator however!
Check that the pump works
with a separate bubble test without the generator in circuit.
Good Flow
Check the camera is correctly peaked at 191kev for Kr81m
Check the camera is
working!
If using an air cylinder,
check that the humidifier is not blocked or leaks.
Check that you have
today's generator! (eg has an old generator been connected by mistake).
| Slow Kr81m Images
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Check the camera is correctly peaked at 191kev for Kr81m
Check that you have the
correct collimator
Check for any gas leaks
(do a bubble test)
Check that the generator
activity is not low (eg poor production run)
If using an air cylinder,
check that the humidifier is in place and has no leaks.
check that the patient has
a good seal with the face mask.
| Poor Image Quality
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Check the camera is correctly peaked at 191kev for Kr81m
Check that you have the
correct collimator
Are the images slow and
have too few counts? - check slow Kr81m images above. If
using a dual energy acquisition protocol then the counts may be too low. Change the time
for the Kr81m view or acquire using single views.
Check the patient aspects.
Is the facemask a good fit? If the patient is poorly and cannot breath in the Kr81m
efficiently or have a good mouthseal then there may be Kr81m gas leaks into the field of
view of the camera. Hold the facemask firmly to form a good seal. If this cannot be
achieved then use a fan to blow any Kr81m gas leakage away from the camera face.
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