Siemens AG SPR8-220.101.04.03.02 MOBILETT Plus HP
07.05 CS PS 24
Inspection and Maintenance 55
Page 55 of 64
Medical Solutions
2.14 Coincidence of radiation and light fields
Fig. 33:
Fig. 34:
NOTE
If the MOBILETT is equipped with a DAP measuring system, re-
move the DAP ionization chamber first.
• 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. (Fig. 33 / p. 55) .
• 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. (Fig. 34 / p. 55) .
• 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”. (Fig. 30 / p. 52)
X
• Check the setting by releasing another exposure.