What tolerance is acceptable for the compression thickness indicator QC criteria?

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In this QC task, the thickness shown by the compression thickness indicator must match the actual compressed thickness within a small, practical margin to ensure the dose and image quality are kept consistent. A tolerance of plus or minus 0.5 cm is chosen because it reflects realistic instrument and measurement variability while still catching meaningful deviations that could affect patient dose or diagnostic quality. Too tight a tolerance, such as plus or minus 0.1 cm, would be unrealistic given typical equipment and phantom measurement uncertainties. Too loose tolerances, like plus or minus 1.0 cm or 2.0 cm, would let larger, clinically significant discrepancies pass unnoticed, potentially impacting dose optimization and image contrast. So, plus or minus 0.5 cm strikes the right balance: it tolerates normal variance but flags readings that could lead to under- or over-exposure.