Article Figures & Data
Figures
- FIGURE 1.
(A) Photograph of hot sphere phantoms. (B) Axial CT image of NEMA phantom with spheres.
- FIGURE 2.
Use of different reconstruction algorithms on PET images of phantom. (A) On 120-min acquisition, small hot spheres were better seen on TOF images and on images reconstructed with 2-mm voxels. (B) On 2-min acquisition, a similar pattern was observed.
- FIGURE 3.
Visual assessment of PET images: 120-min (A and B) and 2-min (C and D) acquisitions; 4-mm (A and C) and 2-mm (B and D) voxel reconstructions.
Tables
Sphere diameter (mm)* Acquisition time Voxel size 4 5 6 8 10 120 min OSEM 4 mm 6.8 13.3 33.5 78.5 166.7 2 mm 13.1 22.3 45.0 92.8 151.9 OSEM+PSF 4 mm NA 11.1 30.1 77.4 195.6 2 mm 7.1 15.8 40.9 116.1 265.4 OSEM+TOF 4 mm 9.5 19.6 48.3 105.1 211.2 2 mm 14.6 31.3 61.2 137.2 190.3 2 min OSEM 4 mm NA 3.1 ± 4.4 7.6 ± 6.2 13.6 ± 4.3 34.6 ± 11.4 2 mm NA NA 12.7 ± 13.2 15.2 ± 5.6 32.2 ± 15.4 OSEM+PSF 4 mm NA 2.8 ± 3.2 7.8 ± 6.5 14.0 ± 1.8 41.3 ± 9.4 2 mm NA 3.7 ± 3.0 11.4 ± 9.6 16.4 ± 2.3 47.5 ± 10.5 OSEM+TOF 4 mm NA 4.6 ± 0.2 8.4 ± 5.1 17.0 ± 1.5 40.2 ± 10.2 2 mm NA NA 12.2 ± 5.5 17.0 ± 2.5 30.3 ± 5.6 ↵* Data are mean, or mean ± SD.
NA = not available.
Sphere diameter (mm)* Acquisition time Voxel size 4 5 6 8 10 120 min OSEM 4 mm 0.12 0.13 0.19 0.32 0.56 2 mm 0.14 0.17 0.26 0.45 0.68 OSEM+PSF 4 mm NA 0.12 0.16 0.28 0.58 2 mm 0.11 0.13 0.21 0.44 0.90 OSEM+TOF 4 mm 0.12 0.14 0.20 0.33 0.56 2 mm 0.13 0.18 0.27 0.50 0.67 2 min OSEM 4 mm NA 0.12 ± 0.05 0.18 ± 0.08 0.25 ± 0.06 0.52 ± 0.17 2 mm NA NA 0.22 ± 0.18 0.26 ± 0.11 0.53 ± 0.29 OSEM+PSF 4 mm NA 0.11 ± 0.03 0.16 ± 0.06 0.24 ± 0.04 0.56 ± 0.15 2 mm NA 0.12 ± 0.04 0.22 ± 0.11 0.32 ± 0.10 0.80 ± 0.30 OSEM+TOF 4 mm NA 0.14 ± 0.01 0.18 ± 0.05 0.27 ± 0.02 0.53 ± 0.07 2 mm NA NA 0.22 ± 0.09 0.27 ± 0.01 0.45 ± 0.03 ↵* Data are mean, or mean ± SD.
NA = not available.
