Instruction Manual
DIAMENTOR E
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Adjusting the DIAMENTOR E
[D151.131.0/3]
Calibration procedure:
a)
The couch should be positioned horizontally.
b)
The diaphragm should be adjusted to give a field size of 10 cm x 10 cm (this can be
measured accurately by exposing a film in this plane).
c)
The distance between focus and the measurement plane should be noted (this distance
should be around 100 cm).
d)
A reference dosemeter should be placed in the reference plane.
e)
A comparison of the dose area product as indicated by the DIAMENTOR E with that
calculated from the reference dosemeter (dose times area) should then be made at a
range of set kVp values across the normal operating range of the X-ray unit. The com-
parison at a range of field sizes (with fixed kVp and mAs) may also be performed.
f)
The mean values of these comparisons will enable the user to derive a suitable
calibration factor or to adjust the sensitivity of the meter, so that the indicated and
measured values match. This calibration should be performed at the typically used
doserates.
