Characterization and validation of the thorax phantom Lungman for dose assessment in chest radiography optimization studies

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  • UZ Leuven - Universitair ziekenhuis Leuven

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Abstract

This work concerns the validation of the Kyoto-Kagaku thorax anthropomorphic phantom Lungman for use in chest radiography optimization. The equivalence in terms of polymethyl methacrylate (PMMA) was established for the lung and mediastinum regions of the phantom. Patient chest examination data acquired under automatic exposure control were collated over a 2-year period for a standard x-ray room. Parameters surveyed included exposure index, air kerma area product, and exposure time, which were compared with Lungman values. Finally, a voxel model was developed by segmenting computed tomography images of the phantom and implemented in PENELOPE/penEasy Monte Carlo code to compare phantom tissue-equivalent materials with materials from ICRP Publication 89 in terms of organ dose. PMMA equivalence varied depending on tube voltage, from 9.5 to 10.0 cm and from 13.5 to 13.7 cm, for the lungs and mediastinum regions, respectively. For the survey, close agreement was found between the phantom and the patients’ median values (deviations lay between 8% and 14%). Differences in lung doses, an important organ for optimization in chest radiography, were below 13% when comparing the use of phantom tissue-equivalent materials versus ICRP materials. The study confirms the value of the Lungman for chest optimization studies.

Details

Original languageEnglish
Article number013504
Number of pages9
JournalJournal of Medical Imaging
Volume5
Issue number(1)
DOIs
Publication statusPublished - 22 Feb 2018

Keywords

  • anthropomorphic phantom, tissue equivalence, Monte Carlo simulations, optimization, digital radiology, chest radiography, organ dose

ID: 4251973