Table 1 Recovery coefficient for the different image reconstruction and kernel combinations. The image reconstruction settings were defined to match the background noise around ~ 10% for the NEMA IQ phantom and ~ 33% for the Small-tumor phantom. Relative deviations (%) apply relative to the OSEM and for PSF reconstructions
Recovery coefficient (relative difference [%]) | Background noise [%] (relative difference [%]) | ||||||
|---|---|---|---|---|---|---|---|
Sphere size | 10 mm | 13 mm | 17 mm | 22 mm | 28 mm | 37 mm | |
OSEM | 0.39 | 0.50 | 0.64 | 0.75 | 0.77 | 0.85 | 9.73 |
OSEM+PRC simplified | 0.43 (9.9) | 0.56 (11.3) | 0.71 (10.8) | 0.79 (5.4) | 0.82 (4.7) | 0.87 (2.4) | 10.83 (11.4) |
OSEM+PRC | 0.53 (36.5) | 0.63 (25.0) | 0.73 (15.4) | 0.81 (8.2) | 0.83 (7.8) | 0.88 (4.4) | 9.35 (−3.8) |
PSF | 0.56 | 0.64 | 0.75 | 0.83 | 0.85 | 0.89 | 9.32 |
PSF+PRC simplified | 0.66 (18.7) | 0.74 (15.7) | 0.85 (13.4) | 0.87 (5.1) | 0.89 (5.3) | 0.92 (3.6) | 9.82 (5.3) |
PSF+PRC | 0.64 (15.7) | 0.72 (12.0) | 0.81 (8.2) | 0.85 (3.1) | 0.88 (3.7) | 0.92 (2.8) | 9.78 (4.9) |
Sphere size | 3.7 mm | 4.8 mm | 6.5 mm | 7.7 mm | 8.9 mm | 9.7 mm | |
|---|---|---|---|---|---|---|---|
OSEM | 0.09 | 0.16 | 0.28 | 0.31 | 0.36 | 0.44 | 32.9 |
OSEM+PRC simplified | 0.10 (6.5) | 0.20 (23.5) | 0.39 (40.0) | 0.45 (42.3) | 0.49 (35.1) | 0.60 (35.4) | 37.5 (13.9) |
OSEM+PRC | 0.15 (71.9) | 0.29 (80.4) | 0.52 (85.9) | 0.54 (73.2) | 0.58 (60.8) | 0.66 (49.6) | 33.5 (1.7) |
PSF | 0.15 | 0.27 | 0.47 | 0.50 | 0.54 | 0.62 | 32.10 |
PSF+PRC simplified | 0.17 (14.7) | 0.34 (27.3) | 0.70 (47.6) | 0.73 (46.2) | 0.76 (41.0) | 0.86 (39.8) | 33.4 (4.1) |
PSF+PRC | 0.20 (36.6) | 0.36 (35.1) | 0.70 (48.2) | 0.75 (49.0) | 0.79 (45.3) | 0.87 (41.1) | 33.9 (5.6) |