Fig. 9.

Derivation of span-1 axial normalisation factors. a Portion of Michelogram showing two native span-11 groups of five and six sinograms in segment ‘0’. For each group one normalisation axial factor is provided by the vendor (as shown for segment ‘+ 1’). b Michelogram of 24-hour cylindrical phantom acquisition in span-1. c Michelogram of the same phantom acquisition as in (b), but in span-11. d Michelogram of axial efficiencies derived using the phantom data and the vendor span-11 axial efficiencies according to Eq. (1). e Axially normalised phantom acquisition