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

Checking the radiation field limitation

Evaluation

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

Alignment radiation field/light field

1. On the film that was placed in the film bag, mark the light field limit with guidance

Radiation field limitation

1. Measured from the chest wall side of the object table, the radiation field must be
2. The radiation field must under no circumstances extend beyond the side edges of
Correction, see Service Instructions.
3. Finally check the radiation field on a film exposed inside the object table.
Repeat this check with all object tables and both "wings" (base plates).
1. adjust within the given tolerance in step 1 above if necessary
Siemens AG
Medical Solutions
Centering cross
Light field
Values for evaluation are defined in the plane of the film bag.
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.
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 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
step 6 above.
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
SPB7-230.033.11
Rev. 06 05.06
*
left: +/- 6.5 mm
*
right: +/- 6.5 mm
*
front: +/- 6.5 mm
*
back: +/- 6.5 mm
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