Deriving staff and public doses in a PET/CT facility from measured radiation levels using thermoluminescent dosimetry

Radiat Prot Dosimetry. 2011 Mar;144(1-4):487-91. doi: 10.1093/rpd/ncq452. Epub 2010 Dec 8.

Abstract

The introduction of PET/CT at King Faisal Specialist Hospital and Research Centre for whole body and brain imaging has become favourable for diagnosis of cancer. There is no data available on the PET/CT dose to staff and members of the public for different activities of (18)F [fluorodeoxyglucose (FDG)] and for longer patient holding time. The study aims to determine and evaluate staff and public doses by using thermoluminescent dosemeters monthly readings for a 7-month deployment period and by using direct measurements of dose rates at 30 cm and 1 m distances from the patients after injection. The whole body doses per procedure and per administered activity of (18)F (FDG) were estimated. A dose map inside the PET/CT was generated to provide information of the dose levels in different locations. The Pearson correlation showed a strong correlation (r(2) = 0.71) between the dose per activity and the number of patients. Optimisation of radiation protection of staff and members of the public was investigated and recommendations were given.

MeSH terms

  • Brain / radiation effects*
  • Calibration
  • Fluorodeoxyglucose F18 / pharmacology*
  • Humans
  • Models, Statistical
  • Occupational Exposure / analysis
  • Occupational Exposure / prevention & control*
  • Positron-Emission Tomography / methods*
  • Quality Control
  • Radiation Dosage
  • Radiation Protection / methods
  • Saudi Arabia
  • Thermoluminescent Dosimetry / instrumentation*
  • Thermoluminescent Dosimetry / methods
  • Time Factors
  • Tomography, X-Ray Computed / methods*
  • Whole Body Imaging

Substances

  • Fluorodeoxyglucose F18