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Table 2 Summary of the model training 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 training
Solid organs and tumors
ntrain \({\alpha }_{0,k}\) \({\alpha }_{1,k}\) \({\alpha }_{2,k}\) \({r}_{\mathrm{train}}^{2}\) ntrain \({\alpha }_{0,k}\) \({\alpha }_{1,k}\) \({\alpha }_{2,k}\) \({r}_{\mathrm{train}}^{2}\)
tf = t1 tf = t2
Kidneys 40 12.01 0.91 0.0153 0.85 36 11.87 0.85 0.0117 0.98
Tumors 39 13.27 1.03  − 0.0105 0.97 35 12.90 0.99 0.0070 0.99
Liver 40 12.37 0.96 0.0205 0.88 36 11.86 0.86 0.0111 0.97
Spleen 37 12.21 1.00 0.0336 0.97 33 12.48 0.93 0.0094 0.99
  tf = t3 tf (t1, t2, t3)
Kidneys 40 11.83 0.83 0.0103 0.95 116 11.86 0.85 0.0111 0.94
Tumors 39 12.76 0.97 0.0081 0.99 113 12.80 0.99 0.0086 0.99
Liver 40 12.57 0.91 0.0077 0.97 116 12.26 0.90 0.0090 0.92
Spleen 37 12.52 0.94 0.0090 0.99 107 12.51 0.95 0.0094 0.98
tf Bone marrow
ntrain \({\Theta }_{\mathrm{BM,BM}}\) \({\Theta }_{\mathrm{BM,RM}}\) \({\beta }_{0,{\mathrm{BM}}}\) \({\beta }_{1,{\mathrm{BM}}}\) \({\beta }_{2,{\mathrm{BM}}}\) \({r}_{\mathrm{train}}^{2}\)
t1 40 1868 319 4.26 1.07 0.0241 0.78
t3 40 1889 315 5.03 0.82 0.0069 0.92
(t1, t3) 80 1879 316 4.59 0.90 0.0101 0.83
  1. tf and ntrain represent, respectively, the time points considered for model training and the number of studies included in each case. α, β and \(\Theta\) represent the regression coefficients obtained for a given organ/tumor and tf. Corresponding coefficients of determination \({r}_{\mathrm{train}}^{2}\) are also shown