Table 1.
Overview of markers per patient and visibility on CT/CBCT
| Patient | No. of markers placed | No. of markers visible on CT | No. of markers visible on CBCT week 1 | No. of markers visible on CBCT week 4 |
|---|---|---|---|---|
| 1 | 4 | 1 | 1 | 1 |
| 2 | 4 | 4 | 4 | 4 |
| 3a | 3 | 2 | a | a |
| 4 | 5 | 1 | 1 | 1 |
| 5 | 3 | 3 | 3 | 3 |
| 6 | 3 | 3 | 3 | 3 |
| 7 | 4 | 4 | 4 | 4 |
| 8 | 4 | 4 | 4 | 4 |
| 9 | 4 | 4 | 4 | 4 |
| 10 | 5 | 5 | 5 | 5 |
| 11 | 3 | 3 | 3 | 3 |
| 12 | 3 | 3 | 3 | 3 |
| 13 | 4 | 4 | 4 | 4 |
| 14 | 5 | 3 | 3 | 3 |
| 15 | 4 | 4 | 4 | 4 |
| 16 | 3 | 0 | 0 | 0 |
| 17 | 4 | 4 | 4 | 4 |
| 18 | 4 | 3 | 3 | 3 |
| 19 | 4 | 2 | 2 | 2 |
| 20 | 3 | 3 | 3 | 3 |
| Total | 76 | 60 | 58 | 58 |
CT = computer tomography; CBCT = cone beam computer tomography
a
patient died of an unrelated event between CT acquisition and start of therapy