NOMEX
Operating Manual - Putting the NOMEX Multimeter into Service
D909.131.00/02 en
27
3.2.2 Computed Tomography and
Dental Panoramic X-Ray
For CT and DENT-PAN applications, the bar with
a width of approx. 1 mm is used (
4
) that
identifies the center of the 3 mm wide measure-
ment area. The measurement area must be
fully
irradiated
).
Figure 9: Measurement area for CT and
DENT-PAN applications
CAUTION
NOMEX multimeter measurements in the pres-
ence of rotating radiation.
Erroneous Measurements!
Rotation of CT and DENT-PAN X-ray units is
not permitted. The X-ray tube should be oper-
ated in the so-called topogram or service mode
and be positioned vertically above the NOMEX
multimeter.
The NOMEX multimeter always needs to be
positioned in a permanently irradiated area. A
rotating field of radiation will lead to erroneous
measurements.
Measurement on CT Systems in the Presence
of Rotating Radiation:
If the rotation of the CT tube and the treatment
table cannot be deactivated (service mode), the
NOMEX multimeter cannot be used to perform
measurements.
Remedy:
CT systems can also be used to create two-
dimensional X-ray images. For this purpose, the
tube moves to 12 o'clock where it stops and the
treatment table travels slowly through the gantry.
•
Choose a small pitch.
•
Move the treatment table out of the gantry as
far as possible.
•
Place the NOMEX multimeter at the bottom of
the gantry.
➔
With this method, neither the NOMEX multime-
ter nor the X-ray tube will move and the mea-
surement can be performed.
