56 Inspection and maintenance
MOBILETT XP Digital SPR8-230.831.30.03.02 Siemens AG
11.05 CS SD 24
Page 56 of 74
Medical Solutions
• Set the central beam so that it is vertical.
• Set a vertical SID of 100 cm.
¹ Use the tape measure in the collimator to measure to the top surface of the
detector.
• Switch on the light localizer and adjust a light field of approx. 30x30 cm on the detector.
• Place the lead ruler (centering cross) centered on the detector.
• Measure the light field and make a note of the dimensions (Fig. 25 / p. 56).
• Position a washer as a side marker.
Fig. 25: Centering cross
• Create a test patient.
• Select an organ program from the "TEST" area with approx. 60 kV, 4mAs.
¹ "Exposure ready" appears in the top right corner on the monitor.
X
• Initiate exposure.
Evaluation: Light field to radiation field
QSQ Deviation ((A + C) / SID)
QSQ Deviation ((B + D) / SID)
• Evaluate the deviations (A, C and B, D) between the recorded light field and the radia-
tion field edges on all four sides using the centering cross (Fig. 26 / p. 57). Use the
zoom function as necessary.
¹ The total permissible deviation (disregarding the prefix) amounts to a maximum
of 1.7% of the SID. If the deviation is > 1.7%, the collimator must be adjusted
(see the "Replacement of Parts" instructions).
Log the deviation.
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