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Gammex Box Calibration for CT Imaging Quality Assessment

Explore how Gammex boxes in a line impact CT numbers, causing shifts in air CT numbers by about 2 HU. Observations show foam CT numbers vary by up to 15 HU for 320 kg/m3 foam. Review calibration requirements for using Gammex boxes as reference standards.

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Gammex Box Calibration for CT Imaging Quality Assessment

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  1. Gammex Boxes in a line scanned together These ROIs propagated through the entire reconstructed volume

  2. Mean of ROIs

  3. Box causes shift in air CT numbers – about 2 HU

  4. Observations • CT Numbers of foam vary from Gammex box to Gammex box • Range 15 HU for 320 kg/m3 foam • Use of Gammex boxes as reference standards will require calibration of each box • Box alters air CT number above the box

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