title: [Reproducibility and accuracy of an optical ssd pointer (author's transl)].
abstract: The reproducibility and accuracy of an optical source-surface distance measuring device was systematically examined. The standard deviation of twenty equal distance settings was +/-0,5%. The error in dose-rate caused by one single adjustment did not exceed +/-2%. The position of the effective source-center is defined by a special inverse square plot. A periodical check is recommended.
mesh_terms: D008433:Mathematics; D008722:Methods; D011867:Radioisotope Teletherapy / Q000295:instrumentation*; D011879:Radiotherapy Dosage
vernacular_title: Reproduzierbarkeit und Genauigkeit des optischen Distanzanzeigers am Gammatron 1