Table 2.

Comparing different pretreatment activity calculation equations.

Method	Activity calculation equation
Empiric38	≥50% Tumor Load ​= ​3 GBq
	25–50% tumor Load ​= ​2.5 GBq
	≤25% Tumor Load ​= ​2 GBq
BSA38	A(GBq) = (BSA-0.2) ​+ ​[ $\frac{\text{tumor}\text{volume}}{\text{tumor}\text{volume}/\text{liver}\text{volume}}$] in whichBSA ​= ​0.20247 ​× ​height(m)0.725 ​× ​weight(kg)0.425
MIRD38	A(GBq) ​= ​$\frac{\mathrm{D}\left(\text{Gy}\right)\times \text{liver}\text{mass}\left(\text{kg}\right)}{50\times \left(1-\text{LFS}\right)}$ with upper limit of lung shunt activity:LFS% ​× ​A (GBq) ​= ​0.61 GBq
Partition38	A(GBq) ​= ​$\frac{D\left(Gy\right)\times \left(\left[{\displaystyle \frac{T}{N}}\times tumormass\left(kg\right)\right]+livermass\left(kg\right)\right)}{49.670\times \left(1-LFS\right)}$ in which, based onMAA SPECT/CT: T/N ​= ​$\frac{\raisebox{1ex}{$\text{Tumor}\text{activity}\left(\text{GBq}\right)$}\!\left/ \!\raisebox{-1ex}{$\text{tumor}\text{mass}\left(\text{kg}\right)$}\right.}{\begin{array}{c}\raisebox{1ex}{$\text{liver}\text{activity}\left(\text{GBq}\right)$}\!\left/ \!\raisebox{-1ex}{$\text{liver}\text{mass}\left(\text{kg}\right)$}\right.\end{array}}$