X-Ray Equipment Quality Control (QC)
Light beam Alignment Test

Every month, conduct light beam alignment and flat field testing as per below.

This will be suitable in consideration of the low workload as per the MPE services advice and IPEM Report 91.

Use the test tool provided taped to the bucky front (laminate for longevity after making the tool).

Collimate to align the light beam to the square and note the orientation. Expose with 50 kV / 2 mAs.

Process the image and then remove any “shuttering” around the primary field so that the entire detector surface can be seen, corner to corner, including the unexposed sections.

• Alignment accuracy - each of the four borders of the image is measured relative to the paperclips
  Accuracy should be within 1% for each of the borders (ie at 150 cm SID tolerance is 1.5 cm, or for 100 cm SID use 1 cm tolerance, or for 180 cm SID use 1.8 cm tolerance).
  • If within the tolerance level, record the reading and PASS.
  • If outside the tolerance, record the reading and FAIL. Also record what action taken following the result: eg discussed with all Operators or called engineer back early.


• Centring – to find the centre of the detector, draw two lines diagonally from corner to corner as shown below in red.
  Measure from the centre of the cross to each border and record result with PASS/FAIL. The primary field centring should be within 1 cm of the centre of the detector position both vertically and horizontally.

Enter Measurements

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