4. Measurement Principles & Theory
Display Messages and Active Messages
2012-10/4.3A
101
Barracuda & QABrowser Reference Manual
Exp. < Delay
The exposure time is too short compared to the delay time.
· Increase the exposure time and/or reduce the values of
delay and/or window time.
Keep in mind that the type of measurement sets the delay
time value. The standard value for radiography use is 5 ms,
but for dental it is 200 ms. See Measurement Type Settings
.
High kVp
Measured tube voltage is higher than that of the selected
kV-range.
· Change to a higher kV-range.
Low kVp
Measured tube voltage is lower than that of the selected
kV-range.
· Change to a lower kV-range.
Low Signal
The Barracuda detects a signal but it is too low to present a
reliable result.
· Increase the mA and/or decrease the distance from X-ray
tube to detector or change the sensitivity for the dose
parameter to High sensitivity or even Very High
sensitivity. Also the kV sensitivity can be changed. You
find these settings if you tap the symbol.
Reposition Detector
The radiation signal on D2 and D1 is not within 5 % (quota
not between 0.95 to 1.05). The most common reason for
this is that the detector area is only partially irradiated, the
detector is tilted, or the filtration differs between D2 and D1
(e.g. heel effect).
· Change the field size or move the detector into the
central beam.
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