Quantum detective efficiency (DQE) measurement methodology based on the international standard IEC 62220-1 is being regarded as an objective performance evaluation metric for the digital Xray graphic system. However, the fast becoming popular mammographic systems are not applied to the IEC 62220-1 standard because the factors affecting measurement are more complicated. In this paper, the DQE measurement methodology for digital mammographic system and the corresponding standard IEC 62220-1-2 was investigated. Further, this measurement method was used for testing the DQE of the digital mammographic system. The DQE value was obtained and the factors affecting measurement were discussed in detail.
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