SERVICE MANUAL
Checkout and adjustments
(Rev. 0) RTG PLUS (120V)
7-21
7.5.3
7.5.37.5.3
7.5.3
Adjustment of the soft tissue filter for CEPHALOMETRIC
Adjustment of the soft tissue filter for CEPHALOMETRIC Adjustment of the soft tissue filter for CEPHALOMETRIC
Adjustment of the soft tissue filter for CEPHALOMETRIC
teleradiography
teleradiographyteleradiography
teleradiography
Set the unit in CEPH, check that the cephalostat assembly is in the
latero-lateral position and perform an exposure at 60 kV for 0.80 sec.
The filter “108” must be assembled on the shutter with the concave part
towards the diaphragm and fastened with the appropriate screws "109".
The filter must be positioned so that the start of the projection on the
exposed film is about 3" (8-9cm) from the center of the projection of the
metal rings indicating the auricular aperture.
The soft tissue filter may then be adjusted depending on the end user's
requirement which may call for more or less evidence of the patient's
profile. Usually this is done after performing several radiographs; when
changing the position of this filter, bear in mind that a 1mm adjustment
on the filter will result in a 10mm variation on the film.
Figure 7-5
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