Info behind Dicom tag - Decay Corrected(0018,9758)

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I seem to have a few doubts so please try to answer these individually.

  1. There seems to be a DICOM tag Decay Corrected(0018,9758). The enumerated values are YES and NO. I have a situation in which this values is YES. If I am not wrong, this suggests that the decay correction has already been applied on the total_dose(0018,1074). Then, SUV value then can be calculated by
    SUVbwScaleFactor = (weight * 1000 / Total_Dose(0018,1074))
    SUVbw = (stored pixel value in Pixel_Data (7FE0,0010) * Rescale_Slope (0028,1053) + Rescale_Intercept (0028,1052)) * SUVbwScaleFactor

  2. Lets assume Decay Corrected(0018,9758) is NO. I also have a decay factor tag (0054,1321). Then is this calculation correct
    SUVbwScaleFactor = (weight * 1000) / (Total_Dose(0018,1074) * decay_factor (0054,1321))
    SUVbw = (stored pixel value in Pixel_Data (7FE0,0010) * Rescale_Slope (0028,1053) + Rescale_Intercept (0028,1052)) * SUVbwScaleFactor

These are links which I have referred

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https://qibawiki.rsna.org/index.php/Standardized_Uptake_Value_(SUV)

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