| Phantom configuration | True sphere/ background ratio | SPECT alone | SPECT- CT | | | Isocontour (%) | Measured volume (cm3) | Error (%) | Isocontour (%) | Measured volume (cm3) | Error Vol. (%) |
| 18,5 MBq/sphere | Cylinder 1 | — | 2% | 6521 | −2,90 | 2% | 6521 | −2,90 | Sphere 1 | 2.8 | 42% | 75,45 | 37,18 | 48% | 57,22 | 4,04 | Sphere 2 | 7.6 | 31% | 22,35 | 6,43 | 27% | 27,08 | 28,95 | Sphere 3 | 9.6 | 27% | 18 | 12,50 | 29% | 16,94 | 5,88 | Sphere 4 | 19.6 | 15% | 14,72 | 84,00 | 19% | 10,91 | 36,38 |
| 37 MBq/sphere | Cylinder 1 | — | 2% | 6180 | −7,98 | 1% | 6735 | 0,28 | Sphere 1 | 6 | 46% | 44,86 | −18,44 | 42% | 49,06 | −10,80 | Sphere 2 | 17 | 25% | 22,58 | 7,52 | 29% | 20,52 | −2,29 | Sphere 3 | 23.4 | 23% | 17,55 | 9,69 | 27% | 14,95 | −6,56 | Sphere 4 | 43.8 | 31% | 10,45 | 30,63 | 35% | 9,08 | 13,50 |
| 55,5 MBq/sphere | Cylinder 1 | — | 1% | 6737 | 0,31 | 1% | 6737 | 0,31 | Sphere 1 | 9.9 | 44% | 45,32 | −17,60 | 31% | 59,28 | 7,78 | Sphere 2 | 29.6 | 33% | 18,62 | −11,33 | 31% | 19,3 | −8,10 | Sphere 3 | 38.6 | 33% | 17,32 | 8,25 | 35% | 16,17 | 1,06 | Sphere 4 | 73.1 | 31% | 14,37 | 79,63 | 40% | 10,53 | 31,63 |
| 74 MBq/sphere | Cylinder 1 | — | NA | NA | NA | NA | NA | NA | Sphere 1 | 16 | 52% | 33,72 | −38,69 | 31% | 54,86 | −0,25 | Sphere 2 | 45 | 21% | 23,5 | 11,90 | 27% | 19,81 | −5,67 | Sphere 3 | 57 | 21% | 18,05 | 12,81 | 27% | 15,49 | −3,19 | Sphere 4 | 114 | 31% | 5,95 | −25,63 | 21% | 8,32 | 4,00 |
| 55 MBq | Cylinder 2 | — | 46% | 709 | −8,40 | 25% | 795 | 2,71 | 116 MBq | Cylinder 2 | — | 46% | 667 | −13,82 | 35% | 770 | −0,52 | 72 MBq | Cylinder 3 | — | 33% | 455 | −3,81 | 23% | 515 | 8,88 |
|
|