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Measurement of energy dependence for XRCT radiochromic film
- Source :
- Medical physics. 33(8)
- Publication Year :
- 2006
-
Abstract
- Gafchromic XRCT, radiochromic film is assessed over a broad energy range, from kilovoltage to megavoltage x rays for variations in reflected optical density to dose response. A large energy dependence was found with reflected optical density output for the same delivered dose varying from 7.8 +/- 0.35 at 25.5 keV (50 kVp) peaking at 12.1 +/- 0.5 at 54 keV (125 kVp) to 0.975 +/- 0.03 at 2300 keV (10 MV) when normalized to 1 at 1400 keV (6 MV) energy. The response is constant (within 3%) in the 36-69 keV equivalent photon energy range, which corresponds to x-ray tube generating potentials of approximately 100-150 kVp. This matches well with beam qualities for diagnostic computed topography applications.
Details
- ISSN :
- 00942405
- Volume :
- 33
- Issue :
- 8
- Database :
- OpenAIRE
- Journal :
- Medical physics
- Accession number :
- edsair.pmid..........a505d0ded5d1f3b8555a89c2fde038b8