Table 2.
Opertor 2 results.
| Phantom configuration | True sphere/ background ratio |
SPECT alone | SPECT-CT | |||||
|---|---|---|---|---|---|---|---|---|
| Isocontour (%) | Measured volume (cm3) | Error (%) | Isocontour (%) | Measured volume (cm3) | Error (%) | |||
| 18,5 MBq/sphere | Cylinder 1 | — | 1% | 7087 | 5,52 | 2% | 6521 | −2,90 |
| Sphere 1 | 2.8 | 31% | 207 | 276,36 | 48% | 57,2 | 4,00 | |
| Sphere 2 | 7.6 | 13% | 104,5 | 397,62 | 28% | 24,4 | 16,19 | |
| Sphere 3 | 9.6 | 19% | 27,4 | 71,25 | 29% | 16,9 | 5,62 | |
| Sphere 4 | 19.6 | 8% | 29,2 | 265,00 | 19% | 10,9 | 36,25 | |
|
| ||||||||
| 37 MBq/sphere | Cylinder 1 | — | 2% | 6180 | −7,98 | 1% | 6700 | −0,24 |
| Sphere 1 | 6 | 7% | 169,7 | 208,55 | 34% | 53,56 | −2,62 | |
| Sphere 2 | 17 | 3% | 113,7 | 441,43 | 23% | 24,34 | 15,90 | |
| Sphere 3 | 23.4 | 3% | 119,78 | 648,63 | 27% | 14,9 | −6,88 | |
| Sphere 4 | 43.8 | 4% | 53,48 | 568,50 | 33% | 9,8 | 22,50 | |
|
| ||||||||
| 55,5 MBq/sphere | Cylinder 1 | — | 1% | 6737 | 0,31 | 1% | 6737 | 0,31 |
| Sphere 1 | 9.9 | 10% | 159,3 | 189,64 | 35% | 55,7 | 1,27 | |
| Sphere 2 | 29.6 | 4% | 85 | 304,76 | 25% | 22,7 | 8,10 | |
| Sphere 3 | 38.6 | 7% | 51,5 | 221,88 | 36% | 15,5 | −3,13 | |
| Sphere 4 | 73.1 | 6% | 44,1 | 451,25 | 36% | 12 | 50,00 | |
|
| ||||||||
| 74 MBq/sphere | Cylinder 1 | — | 1% | 6565 | −2,10 | 1 | 6565 | −2,10 |
| Sphere 1 | 16 | 15% | 99,5 | 80,91 | 32% | 56 | 1,82 | |
| Sphere 2 | 45 | 6% | 54,1 | 157,62 | 23% | 23,7 | 12,86 | |
| Sphere 3 | 57 | 5% | 42,8 | 167,50 | 25% | 17,4 | 8,75 | |
| Sphere 4 | 114 | 2% | 35,8 | 347,50 | 20% | 8,7 | 8,75 | |
|
| ||||||||
| 55 MBq | Cylinder 2 | — | 17% | 887 | 14,60 | 27% | 801 | 3,49 |
| 116 MBq | Cylinder 2 | — | 19% | 855 | 10,47 | 29% | 775 | 0,13 |
| 72 MBq | Cylinder 3 | — | 21% | 520 | 9,94 | 27% | 481 | 1,69 |