Polymer gel dosimetry on a multislice computed tomography scanner: effect of changing parameters on CTDI

B. Hill, A. J. Venning, C. Baldock

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Polymer gel dosimetry undertaken on a multislice CT scanner provides an alternative method to conventional dosimetry measurements. Polymer gel dosimeters were used to measure CT radiation doses and compared to TLD and ionization chamber measurements in different diameter phantoms. CTDI was investigated for each of these phantoms for a range of mAs (100-400 mAs), tube voltage (100-135 kV) and nominal slice width (2-32 mm). Linear fits of the CTDI values for mAs show for the smallest phantom diameter an increase in CTDI of 60% for both TLD and polymer gel dosimeters. A similar increase in CTDI of 50% at 100 kVp and 100% for 135 kVp was also noted. It was also shown that slice width variation measured with either polymer gel or TLD was greatest with the smallest slice widths. In summary, it was found that polymer gels can be used as an alternative dosimeter to TLD for the determination of SWDP and subsequent CTDI calculations.
Original languageEnglish
Pages (from-to)149-158
Number of pages10
JournalPhysica Medica
Volume24
Issue number3
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Computed tomography
  • CT
  • Dose profile
  • Dosimeter
  • MRI
  • Normoxic polymer gel dosimetry
  • Radiation

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