registry 2025 - Quality control values

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12 Terms

1
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Center ray beam QC

Center ray must be within 1% of the SID

2
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Tube distance QC

The actual SID must be with +/- 2% of the indicated SID

3
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Coincidence (collimations) testing

  • The light field must align with the collimated xray field with +/- 2% of the SID

  • Tested semi annually

4
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Exposure Time QC

  • Actual exposure time has to be within +/- 5% of the indicated exposure time (10ms)

  • Tested annually

5
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AEC Testing

to test AEC capabilities. Multiple exposures with different aluminum thicknesses are done. Results are supposed to have the same exposure receptor each time.

6
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kVp Calibration Testing

  • Actual KVP must be within +/- 5% or 10% of the assigned KVP

  • Tested annually

7
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exposure reproducibility

  • If a set of exposure values (Kvp, MA, time) is selected, then it must have the same radiation results each time within +/- 5%

  • Tested annually

8
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Exposure linearity

  • exposure per mAs should not change more than 10% between mA stations (settings)

  • Tested annually

9
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Focal spot testing

  • Within 50%

  • Tested annually

10
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Lead shielding testing

  • testing annually

  • Test cracks in lead shields due to folding

11
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Luminance test

  • Testing grayscale and brightness on monitors

  • Equal or greater than 350 candela/M-square

  • Uses SMPTE or TG-18 test pattern

12
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SMPTE test pattern

  • Used to check monitor performance

  • Used to evaluate on the screen luminance, contrast, geometric distortion, sharpness resolution