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Method for gantry angle repositioning on rotational teletherapy equipment
Author(s) -
Connor W. G.,
Boone M. L. M.,
Mayer E. G.
Publication year - 1975
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 - 10.1118/1.594192
Subject(s) - beam (structure) , counterweight , optics , laser , physics , laser beams , linear particle accelerator , beam optics , particle accelerator , thermodynamics
Repositioning errors for given angles have been found to be as large as ±0.5°. Errors of this magnitude are undesirable and unnecessary. To overcome this difficulty, a small laser was mounted to the counterweight of our accelerator with its light beam projected at 90° to the axis of the x‐ray beam. The light beam is used as a lever arm to indicate large distances (0.125 in.) for small changes in gantry angle (0.1°). Gantry angles can easily be repositioned within 0.1°. Routine use of the laser beam indicator has reduced the time taken to reposition the gantry.