Light Field Relative To The X-Ray Field - Siemens MOBILETT Plus HP Service Instructions Manual

Replacement and repairs on the collimator

Light field relative to the X-ray field

Equipment required: Cassette, X-ray film and coins
NOTE
•
Load a 35 x 35 cm (14" x 14") cassette with film.
•
Place the cassette on a table or a similar surface.
•
Set a SID of 100 cm (39"). Use a measuring tape.
•
Switch on the collimator lamp and align the cassette. Collimate the light field to
25 x 25 cm (10" x 10").
•
Mark the four corners with coins and mark one of the corners with two coins (Fig. 5).
•
Set 52 kV, 2.0 mAs on the control panel.
CAUTION
•
Release an exposure.
•
Develop the film and measure the deviation between the light and the radiation field.
Acceptable deviation ± 1.7% of SID, (Fig. 6).
•
If the deviation is more than 1.7%, adjust with the screws marked C and D (Fig. 2) to
move the light field closer to the radiation field.
•
Repeat the test with a new exposure.
•
If necessary, adjust again until the deviation between the light field and the radiation field
is within the tolerance specified.
•
Reattach cover 1 (Fig. 1).
Siemens AG
Medical Solutions
If the MOBILETT is equipped with a DAP measuring system,
remove the DAP ionization chamber first.
X-ray radiation!
If not observed, risk of radiation exposure.
Use radiation protection!
SPR8-220.061.03
Rev. 03 09.03
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