Installation
3 - 7
Siemens-Elema AB
Register 5
SPB7-230.092.11
Page 7 of 8
MAMMOMAT 3000 Modular
Solna, Sweden
Rev. 01
04.98
SPS-UD
Service
5.
If necessary perform adjustments. The adjustment of the over-radiation at the
chest wall side is done by increasing/decreasing the value in “Main menu”,
“Configuration”, “Beam limiting device”, “Small tungsten, mm from edge”. Press
<F2> to calibrate and then <F2> to save.
6.
With the MAMMOMAT 3000 Modular switched off, follow the procedure
described in step 2 in the reversed order to remove the adapter cable and restore
connector X813 to its original state.
Filter purity verification
3
The test procedure is dependent on the options available at the site.
For best verification, first use magnification table and then 24
8
30 object table. The mag-
nification table activates the small focus, which will reproduce possible impurities on a
larger scale. The 24
8
30 table is used to check the full area of the exposed film. If any of
these two options is not available, use only the one available. If none of these two options
is available, use the 18
8
24 object table.
For each type of filter, perform the following test:
1.
Mount the magnification table.
2.
Insert a loaded film cassette in the table.
3.
Select the filter to be checked.
4.
Select kV and mAs (the exposure setting depends on the film/screen combination
used). Make an exposure.
5.
Develop the film.
6.
Place the film on a film viewing device. The film shall have an even grey
exposure. If not, make a new exposure with a different exposure setting.
7.
If there are any visible particles or differences in homogeneity, proceed according
to “Evaluation of discrepancies on test films” below, until the discrepancy is
removed.
8.
Repeat steps 2
2
7 using a 24 cm
8
30 cm (or 18 cm
8
24 cm) object table.
Evaluation of discrepancies on test films
3
1.
a) Expose a film with a different filter.
b) Expose a film with another cassette.
c) Expose a film with the cassette placed on top of the table.
2.
Compare the original film with the test films exposed in 1a
7
c.
If there are no discrepancies on the film exposed according to 1a, the problem lies
in the filter. The previously used filter must then be cleaned with cotton tops and
ethanol.
Be aware of when performing 1c with magnification table, the
magnification factor will be affected. This must be taken into
consideration when comparing the test film with the original film.
NOTICE