Sirona ORTHOPHOS XG 3 DS, Руководство по обслуживанию, Страница: 178 / 578

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D3352.076.01.13.02 07.2008
4.3 Adjusting the panoramic X-ray unit Tabs 4
Coarse or precision adjustment? In most cases, the diaphragm can be adjusted using precision adjustment
from the start (see step 5 onward). Only in exceptional cases, e.g. if the
exposed image area is completely outside the image field
C in an image
acquired with
PRECISION ADJUSTMENT
setting, is it necessary to perform a
coarse adjustment prior to precision adjustment D . To do this, deactivate the
PRECISION ADJUSTMENT
check box (see page 4-3) and then perform a
coarse adjustment proceeding in the same way as for precision adjustment.
The only difference between coarse
and precision adjustment is the size of
the image area considered. Furthermore, there are fewer auxiliary lines in the
coarse adjustment mode.
X-ray image with unadjusted pan diaphragm:
Alternatively with precision adjustment setting (C) and coarse adjustment setting (D)
On the X-ray image with coarse adjustment D, the exposed area is just barely
visible at the right margin of the image field. Even in this extreme case, an
adjustment would still be possible.
NOTE
i
With SIDEXIS SW V01.45 and higher, a message window indicates whether a
coarse adjustment is required on completion of the precision exposure.
NOTE
i
When the diaphragm is correctly adjust-
ed , a course adjustment does not produce
a meaningful image, since no surrounding
border can be seen in this case (similar to
image C).
C D