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isocenter
isocenter[′ī·sō‚sen·tər] (graphic arts) The unique point common to the principal plane of a tilted photograph and the plane of an assumed truly vertical photograph taken from the same camera station and having an equal principal distance. isocenter The points on a photograph intersected by the bisector of the angle between the plumb line and the photograph perpendicular (i.e., where the principal axis meets the positive or negative plane). On a vertical photograph, the isocenter and photonadir point coincide with the principal point.isocenter
i·so·cen·ter (ī'sō-sen'tĕr) The convergence of the three axes of rotation in radiation therapy; the intersecting point of the axis of rotation of the gantry, the collimator, and the treatment couch. isocenter (i?so-sent'er) [ iso- + center] In radiation oncology, the point through which the central beam of the radiation passes. Synonym: radiation isocentermechanical isocenterThe point at which optical beams intersect radiation isocenterIsocenter. |