Compared to MD-Ob1, AI-FullEd reduced median delineation time by 50%, 61%, 37%, 28% and 14% for lung_lt, lung_rt, oes, cord and heart respectively. For heart, AI-FullEd increased delineation time in 8 of 20 cases. For lung_lt, lung_rt, oes and cord, AI-Std contours exhibited good geometric alignment to MD-Ob1 with median mean surface distances (MSD) <1.1mm and median DSC results of 0.97, 0.98, 0.80 and 0.88 respectively. For heart, agreement was poorer (MSD=3.4mm, DSC=0.90). AI-FullEd led to small improvements in overall agreement for lung, cord and oes, with moderate improvements for heart (Fig1).
![](https://www.estro.org:443/ESTRO/media/Abstracts/447/5dd09ae4-0705-4afd-b6fd-6194365328cc.png)
Except for heart RD, all pipelines exhibited excellent dosimetric agreement with MD-Ob1 (Fig2). For RD, median deviations were within ±0.1% (c.f. ±1.4% for heart) and ±0.7Gy (c.f. ±1.5Gy) for relative volume and dose metrics respectively. For PD, agreement was improved with respective values (inc. heart) within ±0.2% and 0.1Gy. Except for a few outliers and heart RD, the distribution of PD/RD deviations for AI-Std and AI-FullEd was considered nominally equivalent.
![](https://www.estro.org:443/ESTRO/media/Abstracts/447/1a3a6e00-a426-489a-993c-bd39d7bbdfb3.png)