title: In regard to Ruschin et al.
authors: Rex
authors: R
authors: Cheung
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods*; D016371:Cranial Irradiation / Q000379:methods*; D006801:Humans; D016634:Radiosurgery / Q000379:methods*; D061089:Radiotherapy, Image-Guided / Q000379:methods*