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Table 1 Spatial resolution

From: Performance characteristics of silicon photomultiplier based 15-cm AFOV TOF PET/CT

   Filtered backprojection Non-TOF OSEM (VPHD) Non-TOF–PSF (VPHD-S)
FWHM (mm) FWTM (mm) FWHM (mm) FWTM (mm) FWHM (mm) FWTM (mm)
Resolution direction Radial offset 3R (B) 4R (S) 4R (U) 3R (B) 4R (S) 4R (U) 3R (B) 4R (S) 4R (U) 3R (B) 4R (S) 4R (U) 3R (B) 3R (B)
Radial 1 cm 4.69 4.17 4.02 8.93 9.14 8.52 3.87 3.77 3.67 7.63 7.83 7.74 2.72 5.14
10 cm 5.58 5.65 5.28 10.31 10.36 9.95 4.8 4.76 4.68 8.92 9.08 9.11 2.81 5.16
20 cm 7.53 7.52 7.54 13.51 13.88 13.38 7.38 7.36 7.44 13.10 12.99 13.27 2.97 5.58
        NS vs FBP NS vs FBP NS vs FBP NS vs FBP * vs FBP NS vs FBP * vs FBP
NS vs VPHD
* vs FBP
* vs VPHD
Tangential 1 cm 4.08 4.40 3.97 8.42 9.17 8.19 3.69 4.00 3.74 7.57 7.95 7.93 2.69 5.10
10 cm 4.64 4.74 4.23 9.42 9.68 8.83 3.81 4.01 3.82 7.69 8.04 7.86 2.74 5.06
20 cm 5.08 5.13 4.67 9.69 10.14 9.04 4.16 4.62 4.31 8.11 9.03 8.46 2.71 5.15
        NS vs FBP * vs FBP * vs FBP * vs FBP * vs FBP NS vs FBP ** vs FBP
** vs VPHD
** vs FBP
** vs VPHD
Axial 1 cm 4.68 4.57 4.39 10.3 10.38 10.12 4.15 4.00 3.93 9.80 9.80 9.71 3.16 6.71
10 cm 5.83 6.39 5.63 11.19 12.34 11.8 4.87 5.28 4.3 9.05 8.75 9.34 3.92 7.57
20 cm 5.47 6.50 5.70 11.14 13.01 12.57 3.98 4.09 4.01 9.55 9.71 9.75 3.07 6.38
        * vs FBP NS vs FBP NS vs FBP NS vs FBP NS vs FBP NS vs FBP ** vs FBP
* vs VPHD
** vs FBP
* vs VPHD
  1. 3R (B). 4R (S). 4R (U) indicate the three-ring system at Bruges and the four-ring system at Stanford and Uppsala, respectively
  2. Data for 4R (S) and 4R (U) taken from [3]
  3. TOF time-of-flight, PSF point spread function, VPHD VuePoint HD, VPHD-S VuePoint HD with PSF correction, FWHM full width at half maximum, FWTM full width at tenth maximum, FBP filtered backprojection
  4. NS non-significant; *0.01 ≤ p < 0.05; **p < 0.01