Table 2: Percentage coefficient of variation for different reconstruction techniques.

MethodCount levelRelActCF (cycles/cm)CoV%

AR-OSEM-AR5000006.35
BW-FBP5000020.836.37
OSEM-BW5000040.846.36

AR-OSEM-AR10000004.60
BW-FBP10000020.804.56
OSEM-BW10000040.844.65

AR-OSEM-AR15000004.43
BW-FBP15000020.894.50
OSEM-BW15000040.864.43

AR-OSEM-AR: autoregressive filtering before and after ordered subset expectation maximisation algorithm; BW-FBP: Butterworth prefiltering and filtered back projection; OSEM-BW: ordered subset expectation maximisation algorithm and Butterworth postfiltering; RelAct: activity relative to background activity of 1; CF: cut-off frequency. The order of the filter was 2; —: not definable.