Skip to main content

Table 1 Parameters of the double-exponential function used to model the relationship between single-count rates S and activity concentration A = fS → A(S), and the inverse relationship between activity concentration A and single-count rates S = fA → S(A), both for the ingenuity (fIng) and Vereos (fVer) cameras. Two goodness-of-fit criteria are additionally provided for each regression: the coefficients of determination (R2) and the root mean square error (RMSE)

From: Fully digital PET is unaffected by any deterioration in TOF resolution and TOF image quality in the wide range of routine PET count rates

   Exponential regression parameters
y = aebx + cedx
Goodness of fit
   a b c d R2 RMSE
S =fA → S(A) \( {f}_{A\to S}^{Ing} \) 76.42 0.006298 − 73.95 − 0.020330 1.0000 0.22910
\( {f}_{A\to S}^{Ver} \) 183.6 0.001547 − 183.2 − 0.006269 1.0000 0.07143
A =fS → A(S) \( {f}_{S\to A}^{Ing} \) 368.9 0.004056 − 370.2 0.002680 0.9999 0.22390
\( {f}_{S\to A}^{Ver} \) − 117.9 − 0.001315 117.6 0.004609 1.0000 0.06627