Table 1.
Individual volumes of target and overlapping structures contoured on both NoSpc and Spc CT studies
| Patient number |
NoSpc CT |
Spc CT |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CTV (cm3) | PTV (cm3) | OVLrectum (cm3) | OVLbladder (cm3) | OVLPRV-u (cm3) | CTV (cm3) | PTV (cm3) | OVLrectum (cm3) | OVLbladder (cm3) | OVLPRV-u (cm3) | |
| 1 | 48.4 | 95.2 | 2.3 | 4.8 | 2.7 | 54.6 | 111.1 | 0.0 | 5.2 | 2.8 |
| 2 | 42.1 | 81.5 | 1.3 | 7.4 | 2.7 | 44.1 | 83.8 | 0.1 | 0.9 | 2.8 |
| 3 | 65.9 | 127.9 | 1.1 | 0.7 | 1.6 | 69.3 | 130.7 | 0.0 | 0.9 | 1.9 |
| 4 | 51.6 | 101.6 | 1.8 | 8.1 | 5.9 | 45.2 | 87.1 | 0.0 | 2.3 | 5.1 |
| 5 | 136.4 | 222.4 | 5.1 | 8.7 | 13.2 | 145.7 | 233.2 | 2.2 | 11.2 | 13.4 |
| 6 | 59.3 | 118.6 | 3.5 | 6.0 | 2.8 | 54.6 | 108.0 | 0.0 | 2.9 | 2.6 |
| 7 | 81.7 | 161.7 | 5.3 | 8.2 | 3.3 | 71.0 | 147.6 | 0.1 | 6.9 | 2.5 |
| 8 | 58.4 | 112.8 | 0.9 | 4.9 | 4.2 | 60.5 | 94.4 | 0.0 | 0.5 | 3.2 |
| 9 | 112.9 | 183.4 | 2.5 | 10.0 | 4.2 | 110.2 | 182.9 | 0.0 | 10.1 | 4.2 |
| 10 | 48.3 | 93.3 | 2.6 | 7.3 | 5.6 | 44.2 | 84.4 | 0.0 | 1.7 | 3.0 |
| 11 | 46.6 | 91.5 | 2.1 | 0.8 | 5.4 | 45.5 | 95.1 | 0.7 | 2.1 | 5.2 |
| Mean | 68.3 | 126.3 | 2.6 | 6.1 | 4.7 | 67.7 | 123.5 | 0.3 | 4.0 | 4.2 |
| Standard deviation | 30.4 | 44.6 | 1.5 | 3.1 | 3.1 | 32.3 | 47.6 | 0.7 | 3.8 | 3.2 |
CTV, clinical target volume; NoSpc, CT scan before spacer insertion; OVLbladder, overlap between PTV and bladder; OVLPRV-u, overlap between PTV and urethral-PRV; OVLrectum, overlap between PTV and rectum; PRV, planning at risk volume; PTV, planning target volume; Spc, CT scan after spacer insertion.