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Reduced output of orthovoltage radiotherapy units: three case reports
Author(s) -
Kennelly Edward V.
Publication year - 1974
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 - 10.1118/1.1637276
Subject(s) - beam (structure) , radiation therapy , tube (container) , external beam radiotherapy , nuclear medicine , medicine , intensity (physics) , port (circuit theory) , dosimetry , medical physics , optics , radiology , materials science , brachytherapy , physics , engineering , electrical engineering , composite material
On three separate occasions, calibrations of radiotherapy orthovoltage units disclosed considerably reduced useful beam intensities without any apparent alteration of the tube current or tube voltage. These reductions would have been undetected by routine daily operation of the equipment unless a useful beam intensity monitoring unit were installed at the tube port or daily measurements were made of the useful beam intensity with calibrating instruments. Either or both monitoring methods are recommended for all radiotherapy units.