Calculation of normalized organ doses for pediatric patients undergoing CT examinations on four types of CT scanner

J. T.M. Jansen, Paul Shrimpton

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

Patient doses due to Computed Tomography (CT) are becoming increasingly important in diagnostic radiology, with there being particular concern about examinations on children owing to their increased radiosensitivity. We have computed organ doses normalized to CTDIair using the University of Florida (UF) voxelized pediatric phantoms in relation to the General Electric 9800, Philips LX, Siemens DRH and Siemens Sensation 16 CT scanners. For a whole body examination, the normalized effective dose E103 (as a convenient summary of organ doses) increases by 30% when the age decreases from 14 years to 9 months. This trend is consistent with published results from our previous study based on pediatric and adult mathematical phantoms. Further calculations of normalized effective doses for adult mathematical phantoms also show good agreement with that study under similar conditions of modeling, although updated dose coefficients differ from the previously published data by +35% ± 2%, +16% ± 8% and 6% ± 5%, for examinations of the head & neck, chest, and abdomen & pelvis, respectively. These differences are due to changes in both the definition of effective dose (E60 to E 103) and the adult MIRD-like phantom (from NRPB18+ to HPA18+) to incorporate the new risk and remainder organs.

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering
Subtitle of host publicationRadiation Protection and Dosimetry, Biological Effects of Radiation
PublisherSpringer Verlag
Pages116-119
Number of pages4
Edition3
ISBN (Print)9783642039010
DOIs
Publication statusPublished - 2009
EventWorld Congress on Medical Physics and Biomedical Engineering: Radiation Protection and Dosimetry, Biological Effects of Radiation - Munich, Germany
Duration: 7 Sep 200912 Sep 2009

Publication series

NameIFMBE Proceedings
Number3
Volume25
ISSN (Print)1680-0737

Conference

ConferenceWorld Congress on Medical Physics and Biomedical Engineering: Radiation Protection and Dosimetry, Biological Effects of Radiation
Country/TerritoryGermany
CityMunich
Period7/09/0912/09/09

Keywords

  • Computed tomography
  • Conversion coefficients
  • Dosimetry
  • Pediatric

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