EJNMMI Physics

Table 3 Summary of the model evaluation for kidneys, tumors, liver spleen and bone marrow

From: Simple model for estimation of absorbed dose by organs and tumors after PRRT from a single SPECT/CT study

	Model evaluation
	Solid organs and tumors
	t_f = t₁ and t_s = t₁		t_f = t₂ and t_s = t₂		t_f = t₃ and t_s = t₃		t_f = (t₁, t₂, t₃) for model fitting
	t_f = t₁ and t_s = t₁		t_f = t₂ and t_s = t₂		t_f = t₃ and t_s = t₃		t_s = t₁		t_s = t₂		t_s = t₃
	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)
Kidneys	32	0.85	28	0.96	32	0.95	32	0.84	28	0.95	32	0.93
Tumors	32	0.88	28	0.95	32	0.99	32	0.88	28	0.97	32	0.98
Liver	32	0.71	28	0.93	32	0.95	32	0.67	28	0.92	32	0.95
Spleen	31	0.92	27	0.98	31	0.99	31	0.93	27	0.95	31	0.99

	Bone marrow
	t_f = t₁ and t_s = t₁		t_f = t₃ and t_s = t₃		t_f = (t₁, t₃) for model fitting
	t_f = t₁ and t_s = t₁		t_f = t₃ and t_s = t₃		t_s = t₁		t_s = t₃
	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)	n_test	\({r}_{\mathrm{test}}^{2}\)
Bone marrow	31	0.91	31	0.97	31	0.87	31	0.96

n_test represents the number of data considered for evaluation of the model. The time points t_f and t_s represent, respectively, the time considered for model training and for calculation of the absorbed dose using the MLR equation at t_f. The coefficients of determination \({r}_{\mathrm{test}}^{2}\) are also shown

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