Coincidence Of Radiation And Light Fields - Siemens MOBILETT Plus HP Maintenance Instruction

Inspection and Maintenance
2.14

Coincidence of radiation and light fields

Fig. 33:
Fig. 34:
NOTE
•
Insert a film into the 35 x 35 cm (14" x 14") cassette.
•
Place the cassette on a table or similar surface.
•
Set the SID to 100 cm (39") (use a tape measure).
•
Switch the collimator lamp on and align the cassette. Now collimate the light field to 25
x 25 cm (10" x 10").
•
Mark the four corners of the light field with coins and identify one of the corners with an
additional coin.
•
Set 52 kV and 2.0 mAs on the control and display panel.
•
X
Release an exposure.
•
Develop the film and measure the deviation between the light and radiation fields. A de-
viation of ± 1.7 % of the SID is acceptable.
•
If the deviation is larger than 1.7%, correct the coincidence of the light and radiation
fields by adjusting the nuts marked "D" and "E".
•
X
Check the setting by releasing another exposure.
Siemens AG
Medical Solutions
If the MOBILETT is equipped with a DAP measuring system, re-
move the DAP ionization chamber first.
(Fig. 33 / p. 55)
SPR8-220.101.04.03.02
07.05
.
(Fig. 34 / p. 55)
(Fig. 30 / p. 52)
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CS PS 24
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MOBILETT Plus HP
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