Performance on Cervix
The DIRNet 4 model was able to achieve a higher Dice, Jaccard, and lower average symmetric surface distance among all other DIRNet variants evaluated across 15 patients. On average, the DIRNet 4 model achieved closer contours (a lower ASSD with a mean of 1.61 ± 0.46 mm) than all other models. The DIRNet 4 achieved mean scores of 0.89 ± 0.02, 0.86 ± 0.04, and 1.61 ± 0.46 mm for the Dice, Jaccard, and ASSD, respectively, which are higher than other models (Tables Average symmetric surface distance (ASSD) calculated over deformed pelvic masks and the ground-truth masks for the different variants of DIRNet models. Results are given for the entire DIRNet models for the cervix, bladder, and rectumRepresentative slices of the registered image by the different DIRNet models, in comparison with the conventional intensity-based image registration (SimpleElastix). Red, blue, and yellow contours correspond to the bladder, cervix, and rectum, respectivelyAmong other models, the basic DIRNet model (DIRNet 1) achieved a higher score in terms of the Dice, Jaccard, and ASSD for the cervix. Furthermore, the DIRNet 3 exhibited a higher score, compared to the SimpleElastix based on ASSD and Jaccard scores. However, based on the Dice score, DIRNet 3 and SimpleElastix had the same performance on the cervix. More detailed results are summarized in Tables 