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Principles in positioning cross‐projecting lasers
Author(s) -
Thomadsen Bruce R.
Publication year - 1981
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594960
Subject(s) - laser , isocenter , optics , perpendicular , line (geometry) , rotation (mathematics) , physics , computer science , mathematics , artificial intelligence , imaging phantom , geometry
With the increased sophistication of lasers used for patient positioning in radiotherapy comes increased possibilities for mistakes in installing the lasers, which can result in serious patient positioning errors. Two principles must be followed when mounting cross‐projecting lasers: (1) the horizontal line must be on the same level as the treatment unit isocenter, and the vertical line must be coplanar with the gantry rotation, and (2) If one of the lines of the cross rotates, it must be the line which is perpendicular to the line joining the two holes from which the laser beams exit the laser casing.