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

Table 1.

The ROI correction background correction (a correction calculation formula) proposed.

Corrected activity related to the background	Corrected calculation formula	(ROI TU—ROI_Bk)/ROI_Bk = ROI_c TU
	for TU liver localization	(ROI TU_liver—ROI_liver)/ROI_Bk = ROI_c TU
	ROI calculated for normal tissue	(ROI_liver—ROI_Bk)/ROI_Bk = ROI_{c liver}
		(ROI_spleen—ROI_Bk)/ROI_Bk = ROI_{c spleen}
		(ROI_lung—ROI_Bk)/ROI_Bk = ROI_{c lung}

ROI: regions of interest (counts/pixels); ROI TU: regions of interest for tumoral uptake; ROI_Bk: regions of interest for right thigh; ROIc: corrected regions of interest; ROI_c TU: corrected regions of interest for tumoral uptake; ROI TU_liver: regions of interest for tumoral uptake (liver localization); 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.