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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