Siemens AG SPR8-230.814.30.03.02 MOBILETT XP Digital
11.05 CS SD 24
Start-up 37
Page 37 of 70
Medical Solutions
Light field/radiation field 0
Checking the light and radiation field
• Place the detector (35 cm x 43 cm) on the tabletop.
• Set the central beam so it is vertical.
• Set a vertical SID of 100 cm; measure to the upper edge of the detector using the tape
measure in the collimator.
• Switch on the light localizer and set a light field of approx. 30 cm x 30 cm.
• Place the lead ruler (centering cross) centered on the detector.
• Measure the light field and make a note of the dimensions (Fig. 16 / p. 37).
• Position a washer as a side marker.
Fig. 16: Centering cross
• Create a test patient.
• Select an organ program from the "test" range, with approx. 60 kV, 4 mAs.
X
• Release an exposure.
Evaluation: light field to radiation field 0
• Using the centering cross, evaluate on screen, on all four sides, the deviations (A, C
and B, D) between the recorded light field and the radiation field edges (Fig. 17 / p. 38).
Use the zoom function as necessary.
P ¹ The maximum total allowable deviation from the SID is 1.7% (regardless of the
prefix). If the deviation is > 1.7%, the collimator must be adjusted (see the
"Replacement of Parts" instructions).
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