. 2021 Oct 17;11(10):1042. doi: 10.3390/jpm11101042

Table 2.

Calculation formulas for uncorrected and corrected uptake indices.

Indices	Uncorrected Indices	Corrected Indices
I₁	I_1unc = ROI TU/ROI_liver	I_1c = ROI_C TU/ROI_{c liver}
I₂	I_2unc = ROI TU/ROI_spleen	I_2c = ROI_C TU/ROI_{c spleen}
I₃	I_3unc = ROI TU/ROI_lung	I_3c = ROI_C TU/ROI_{c lung}

I₁: uptake index 1; I₂: uptake index 2; I₃: uptake index 3; unc: uncorrected; c: corrected; ROI TU: regions of interest for tumoral uptake; ROI_liver: regions of interest for liver; ROI_{c liver}: corrected regions of interest for liver; ROI_spleen: regions of interest for spleen; ROI_{c spleen}: corrected regions of interest for spleen; ROI_lung: regions of interest for lung; ROI_{c lung}: corrected regions of interest for lung.