Which quality control test primarily checks the thickness indicator accuracy?

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The main idea is ensuring the system’s thickness indicator truly reflects the actual breast thickness. In mammography, the thickness indicator helps determine the technique (like target mAs and kVp) and, in some setups, guides automatic exposure or dose calculations. To verify this, a phantom with known, precise thickness is imaged and the indicator’s reading is compared to that known value. If the indicator matches within the accepted tolerance, the reading is accurate, and the system can deliver appropriate exposure and image quality. If there’s a discrepancy, calibration or adjustment of the indicator or related exposure controls is needed.

Image contrast tests focus on distinguishing different tissue densities, not on whether the thickness readout is correct. Detector alignment checks ensure the detector is correctly positioned relative to the beam, affecting geometry but not the accuracy of the thickness readout. Exposure reproducibility looks at consistency across repeated exposures, but it doesn’t specifically confirm that the thickness indicator reflects actual thickness.