A simple method for use in QC of CT for radiation therapy treatment planning

Robin L Stern, L. T. Niklason, R. K. Ten Haken

Research output: Contribution to journalArticle


A simple procedure for monitoring constancy of spatial measurement and CT number determination from CT images used in radiation therapy treatment planning is described. The procedure uses low-Z material rods glued to the underside of the CT table insert and does not require a special phantom. Measurements are made on the same patient images used for treatment planning. Deviations from predetermined baseline values outside quality control limits of ±2 mm in spatial resolution and ±20 CT numbers in density can be detected with a confidence level of 97% or better.

Original languageEnglish (US)
Pages (from-to)73-76
Number of pages4
JournalMedical Dosimetry
Issue number2
StatePublished - 1992
Externally publishedYes



  • CT treatment planning
  • Quality control

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation
  • Health Professions(all)
  • Medicine(all)

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