Table 4: Full width at half maximum values for the different methods.

MethodRelAct10 Ø20 Ø40 Ø60 Ø

A
AR-OSEM-AR019.725.045.864.8
BW-FBP017.923.243.563.8
OSEM-BW019.423.243.662.8

AR-OSEM-AR221.535.359.1
BW-FBP223.236.659.6
OSEM-BW222.235.859.1

AR-OSEM-AR413.418.437.857.8
BW-FBP415.820.437.957.9
OSEM-BW415.219.937.757.9

B
AR-OSEM-AR023.723.743.062.3
BW-FBP018.622.441.261.4
OSEM-BW018.823.241.961.7

AR-OSEM-AR219.419.838.959.0
BW-FBP219.021.038.558.9
OSEM-BW217.719.938.559.0

AR-OSEM-AR413.019.737.858.2
BW-FBP415.421.037.757.9
OSEM-BW414.220.237.958.1

C
AR-OSEM-AR020.223.940.963.2
BW-FBP018.521.140.661.7
OSEM-BW016.823.240.362.3

AR-OSEM-AR215.819.539.058.6
BW-FBP216.920.838.658.7
OSEM-BW216.520.339.158.6

AR-OSEM-AR412.519.037.658.2
BW-FBP414.019.636.858.0
OSEM-BW413.819.337.457.9

A: low count level; B: intermediate count level; C: high count level; 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; Ø: diameter.