CT dose estimation using Gafchromic XR-CT film: Models comparison

Ying Lan Liao, Hui Chuan Kao, Keh Shih Chuang, Chih Ping Chen, Hui Yu Tsai*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

6 Scopus citations


Previous studies have established four dose response models for Gafchromic films. However, there have been no reports comparing the four dose response models for XR-CT film; and the XR-CT film responses in phantoms at different positions remain unclear. The purpose of this study was to compare the dose response models and to determine the most suitable one for XR-CT film. The correction factors for the energy dependencies of films inside the head and body dosimetry phantoms were assessed. The most appropriate dose response model for Gafchromic XR-CT film was Dfilm = a (netPV-k)2 + b (netPV-k). The XR-CT films could be used to measure CTDI values in phantoms with appropriate correction factors. Moreover, the doses estimated from XR-CT films used in the Taiwan CT survey agreed with the data measured using the ionization chamber. The Gafchromic XR-CT film could be used to measure CTDI values with the appropriate dose response model and correction factors.

Original languageEnglish
Pages (from-to)2052-2055
Number of pages4
JournalRadiation Measurements
Issue number12
StatePublished - 12 2011


  • Dose response
  • Energy dependence
  • Gafchromic XR-CT
  • Radiation dosimetry
  • Radiochromic film


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