ESTRO 2024 - Abstract Book

S3985

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

Results:

Our results showed a significant decrease in spine length (p<0.001) measured on the morning and afternoon CBCTs, with a mean ΔLD of -1.2±0.7 mm, and a range of -3.9–0.0 mm (Fig. 1). The mean time interval between the morning and afternoon CBCTs was 05:41±01:03 hours, with a range of 04:12–09:28 hours. We found a weak and not significant correlation (ρ=0.20; p=0.09) between time interval and spine length variation. The mean height of the patients, 145±22 (range 100–175) cm (Table 1), was weakly and not significantly correlated with spine length variation (ρ=-0.20; p=0.40). Similarly, the correlation between patients’ mean weight, 38.5±15.5 (range 14.9–68.0) kg, was also weakly and not significantly correlated with the spine length variation (ρ=-0.15; p=0.51).

Conclusion: