Evaluation; Alignment Radiation Field/Light Field; Radiation Field Limitation - Siemens MOMMOMAT 1000 Installation And Start-Up Instructions Manual

Checking the radiation field limitation

Evaluation

*
left
Object table
Chest-wall side
Cassette film
Fig. 2 Field limitation
NOTICE

Alignment radiation field/light field

1.

Radiation field limitation

1.
2.
Correction, see Service Instructions.
3.
Repeat this check with all object tables and both "wings" (base plates).
1. adjust within the given tolerance in point 1 above if necessary
Siemens-Elema AB
Solna, Sweden
Centering cross
Light field
Values for evaluation are defined in the plane of the film bag.
On the film that was placed in the film bag, mark the light field limit with guidance
of the coin marks as shown in (Fig. 2) above.
The maximum divergence between radiation field and light field of 6.5 mm must
not be exceeded on any side.
Measured from the chest wall side of the object table, the radiation field must be
within -4 and +5 on the chest wall side and must not exceed 188 mm (18x24 film)
and 248 mm (24x30 film) on the nipple side.
The radiation field must under no circumstances extend beyond the side edges of
the object table. The margins to the edges must at least be 7 mm. Compare the
side values read off on film-bag film with the corresponding values written down in
point 6 above.
Finally check the radiation field on a film exposed inside the object table.
18x24 film must be completely exposed on all sides. 24x30 film might have up to
3 mm white edge on the nipple side
exposed
Register 3
*
back
188/248
*
right
Allowed overradiation vs. object table
-4 mm
+5 mm
*
front
Radiation field
1
. The other sides must be completely
SP B7-230.033.07
Rev. 03 11.99
*
left: +/- 6.5 mm
*
right: +/- 6.5 mm
*
front: +/- 6.5 mm
*
back: +/- 6.5 mm
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