How Many Dosemeters are Needed for Correct Mean Organ Dose Assessment When Perfoming Phantom Dosimetry? A Phantom Study Evaluating Liver Organ Dose and Investigating TLD Numbers and Ways of Dosemeter Placement

Peter H Pedersen, Asger G Petersen, Svend E Ostgaard, Torben Tvedebrink, Søren P Eiskjær

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Abstract

This study evaluated repeated mean organ dose measurements of the liver by phantom dosimetry and statistical modelling in order to find a way to reduce the number of dosemeters needed for precise organ dose measurements. Thermoluminescent dosemeters were used in an adult female phantom exposed to a biplanar x-ray source at three different axial phantom rotations. Generalised mixed linear effect modelling was used for statistical analysis. A subgroup of five to six organ-specific locations out of 28 yielded mean liver organ doses within 95% confidence intervals of measurements based on all 28 liver-specific dosemeter locations. No statistical difference of mean liver dose was observed with rotation of the phantom either 10° clockwise or counter-clockwise as opposed to the coronal plane. Phantom dosimetry handling time during organ dose measurements can be markedly reduced, in this case the liver, by 79% (22/28), while still providing precise mean organ dose measurements.

Original languageEnglish
JournalRadiation Protection Dosimetry
Volume189
Issue number4
Pages (from-to)475-488
Number of pages14
ISSN0144-8420
DOIs
Publication statusPublished - May 2020

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