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The aim of this work was to evaluate the reliability of the square of the signal-to-noise ratio rate,SNR    rate    2    , as a precise measurement for quality control test in a digital fluoroscopy system. The quasi-ideal model observer was used to measureSNR    rate    2    . The dose rate, pulse rate and field of view were varied, and their effect on dose efficiency, defined asSNR    rate    2    /P    KA   ,   rate, was evaluated (whereP    KA  ,  rateis the air kerma-area product rate). Measurements were repeated to assess reproducibility. The relative standard deviation inSNR    rate    2    /P    KA  ,  rateover seven consecutive measurements was 5 %. No significant variation inSNR    rate    2    /P    KA  ,  ratewas observed across different pulse rates (10–30 pulses s −1 ). The low-dose-rate setting had a superior dose efficiency compared with the medium- and high-dose-rate settings. A smaller field of view resulted in higher dose efficiency.

ASSESSING THE USEFULNESS OF THE QUASI-IDEAL OBSERVER FOR QUALITY CONTROL IN FLUOROSCOPY