Fig. 4

a Relationship between EANM-based absorbed dose (D_EANM) and image-based absorbed dose with PVC (\( {\overline{D}}_{\mathrm{image},\mathrm{PVC}} \)), using the regression equation: \( {\overline{D}}_{\mathrm{image},\mathrm{PVC}}=0.94\times {D}_{\mathrm{EANM}}+1.35 \) (95% CIs of slope and y-intercept = 0.80–1.08 and − 32.2–34.8, respectively]. b The Bland-Altman analysis was performed between D_EANM and \( {\overline{D}}_{\mathrm{image},\mathrm{PVC}} \). There was also fixed bias (− 12.4 Gy [95% CI = − 20.3 to − 4.4]) but no proportional bias (Pearson’s correlation coefficient = 0.11 [95% CI = − 0.17–0.39]). Note that each symbol in the figure represents three therapeutic outcomes: open circle, hypothyroidism; open triangle, euthyroidism; and cross, hyperthyroidism