Table 2 Priorities for VOI alignment in expert-approved IGRT corrections resulting from clustering on combinations of VOIs with an improvement compared with the bony pre-match
Cluster label | Improvement – pattern {S VOIj }Fi | Number of fractions within cluster in % | |||
|---|---|---|---|---|---|
pPTV | tPTV | Brainstem | Spinal cord (boost) | ||
Cluster 2 | 1 | 1 | 1 | 1 | 39.4 |
Cluster 1 | 1 | 1 | 0 | 1 | 19.4 |
Cluster 6 | 1 | 1 | 1 | 0 | 5.9 |
Cluster 8 | 0 | 0 | 1 | 1 | 5.9 |
Cluster 14 | 0 | 1 | 1 | 1 | 5.4 |
Cluster 10 | 1 | 0 | 1 | 1 | 5.0 |
Cluster 7 | 0 | 0 | 0 | 1 | 3.9 |
Cluster 3 | 0 | 1 | 0 | 1 | 2.2 |
VOI priority | 3 | 2 | 4 | 1 | |