Target localization accuracy in frame‐based stereotactic radiosurgery: Comparison between MR‐only and MR/CT co‐registration approaches. - Pappas, Eleftherios P.; Seimenis, Ioannis; Kouris, Panagiotis; Theocharis, Stefanos; Lampropoulos, Kostas I.; Kollias, Georgios; Karaiskos, Pantelis (Journal of Applied Clinical Medical Physics, 2022)