3D CBCT Artefact Removal Using Perpendicular Score-Based Diffusion Models. - Susanne Schaub; Florentin Bieder; Matheus L. Oliveira; Yulan Wang; Dorothea Dagassan-Berndt; Michael M. Bornstein; Philippe C. Cattin (DGM4MICCAI@MICCAI, 2025)