C-Arm Positioning for Spinal Standard Projections in Different Intra-operative Settings - Kausch, Lisa; Thomas, Sarina; Kunze, Holger; Norajitra, Tobias; Klein, André; Barbari, Jan el; Privalov, Maxim; Vetter, Sven Y.; Mahnken, Andreas H.; Maier-Hein, Lena; Maier-Hein, Klaus H. (Medical image computing and computer assisted intervention - MICCAI 2021 ; Part 4, 2021)