title: Measurement of beam-axis displacement from the isocenter during three-dimensional conformal radiosurgery with a micro-multileaf collimator.
abstract: We describe the displacement of the beam-axis from the planning isocenter in clinical situations during three-dimensional conformal radiosurgery using an Acculeaf bi-directional micro-multileaf collimator. The displacements were recorded for 64 ports using a video imaging system and a stereotactic arc. The mean displacement was 0.41+/-0.25 mm.
authors.affiliation: Department of Radiology and Neurosurgery, Keio University, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
authors.forename: Etsuo
authors.initials: E
authors.lastname: Kunieda
authors.forename: Osamu
authors.initials: O
authors.lastname: Kawaguchi
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Saitoh
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Fujisaki
authors.forename: Atsuya
authors.initials: A
authors.lastname: Takeda
authors.forename: Takatsugu
authors.initials: T
authors.lastname: Kawase
authors.forename: Hossain M
authors.initials: HM
authors.lastname: Deloar
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Shigematsu
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kubo
mesh_terms: D001932:Brain Neoplasms / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional; D016634:Radiosurgery / Q000295:instrumentation*; D020266:Radiotherapy, Conformal / Q000295:instrumentation / Q000379:methods*; D013238:Stereotaxic Techniques