ESTRO 2024 - Abstract Book

S3028

Physics - Autosegmentation

ESTRO 2024

Results:

HyperSight CBCT did not lead to clinically relevant differences in correction time compared to conventional Ethos CBCT (median time reduction (interquartile range): 0.1 (3.2) minutes, p=0.52). Median confidence scores for delineation were significantly higher in HyperSight CBCT images for prostate (4.6 vs 3.4, p<0.001), seminal vesicles (4.3 vs 3.3, p<0.001), and rectum (4.8 vs 4.4, p<0.001), with no statistical difference observed for bladder (4.9 vs 4.7, p=0.019) and bowel (4.6 vs 4.4, p=0.182). Overall, HyperSight CBCT resulted in a slightly improved autosegmentation accuracy for all organs, but the differences were not statistically significant, except for bowel HD95 (Table 1; Figure 1). For the seminal vesicles, the interobserver agreement was significantly better in HyperSight CBCT compared to conventional Ethos CBCT for both DSC and HD95 (p<0.001), but not for the other organs (Table 1). Interestingly, one patient with a body mass index of 39.9 showed deviating results in the conventional Ethos CBCT only, attributed to poor image quality, which was not observed in HyperSight CBCT.