Table 2.

Minimum performance metrics for successful MRT in hyperthermia treatments.

Measure	Metric	Definition	Minimum
Bias	Mean error (ME)	$\mathrm{ME}=\frac{1}{n}{\displaystyle \sum }_{j=1}^n(E_j-A)$	≤|0.5 °C|
Spatial temperature precision	Spatial temperature standard deviation (SD)	${\mathrm{SD}}^2=\frac{1}{n}{\displaystyle \sum }_{j=1}^n{(E_j-\overline{E})}^2$	≤0.5 °C
Temporal temperature precision	Temporal temperature standard deviation (SD)	Variability at different time points over 90 min	≤0.5 °C
Accuracy	Mean absolute error (MAE)	$\mathrm{MAE}=\frac{1}{n}{\displaystyle \sum }_{j=1}^n\left|E_j-A\right|$	≤1 °C