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Table 1 Mean percentage difference between the reconstructed and the true emission images and SD for each tissue type obtained for all configurations included in this study. Reference configuration corresponds to proposed MLAA with reference object defined as one water cylinder (cyl) filled with A0 activity concentration, CRT = 300 ps and 107 coincidences. Results obtained with fixed attenuation values in air pixels (F.A.) are included below

From: Simultaneous emission and attenuation reconstruction in time-of-flight PET using a reference object

ConfigurationBoneSoft tissueAdipose tissueLung
MeanSDMeanSDMeanSDMeanSD
Standard MLAA− 66.43.1− 64.53.6− 57.79.7− 60.77.0
Reference3.39.36.79.18.114.39.112.6
A = 054.414.061.013.459.621.564.819.4
A = A0/27.89.513.19.114.115.015.413.5
A = A0·2− 0.89.43.28.44.513.25.513.5
Lung cyl155.324.5166.121.4177.343.4174.840.4
None cyl− 1.98.83.88.65.313.55.712.8
2 water cyl1.89.36.28.47.614.38.713.2
4 water cyl1.99.56.29.18.614.38.913.7
100 ps, 10583.368.973.574.878.5102.078.791.6
300 ps, 105104.2153.0120.2148.4124.5194.1126.7195.0
540 ps, 10585.3159.196.7160.8115.2221.8118.1225.5
100 ps, 10615.314.917.216.117.921.817.419.9
300 ps, 10613.825.016.529.019.038.818.841.8
540 ps, 10640.748.651.247.657.167.761.575.9
100 ps, 1075.94.47.04.77.47.07.76.1
540 ps, 107− 2.615.98.413.211.919.516.222.2
Reference F.A.7.09.08.410.77.520.59.814.4
Lung cyl F.A.− 0.27.91.79.6− 0.415.01.912.1
Bone cyl F.A.9.69.010.610.410.021.811.714.2
A = 0 F.A.15.29.917.711.213.923.018.715.9
A = A0/2 F.A.16.89.018.411.315.522.619.516.9
A = A0·2 F.A.− 1.78.90.09.3− 0.417.61.314.2
  1. cyl cylinder