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Difference a in the gross tumour volume (gtv) and clinical target volume (ctv) between the repeat computed tomography (ct) scans and the planning ct scans
| gtv | ||||
|---|---|---|---|---|
| Primary | Nodal | Upper neckctv | Lower neckctv | |
| Mean difference (%) | +1.6±3.4 | −6.0±10.0 | −1.3±2.6 | +1.7±4.0 |
Percentage of the absolute volume, obtained by comparing the gtv and ctv volumes from the repeat ct scans with the corresponding planning ct scan.
