Validation study of the thorax phantom Lungman for optimization purposes

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper

Authors

Institutes & Expert groups

  • KUL - Katholieke Universiteit Leuven
  • UZ Leuven - Universitair ziekenhuis Leuven

Documents & links

DOI

Abstract

This work aims to investigate the advantages and limitations of the Kyoto Kagaku thorax phantom Lungman for use in chest radiography optimization studies. First, patient survey data were gathered for chest posterior anterior (PA) and lateral (LAT) examinations in a standard chest X-ray room over a period of one year, using a Caesium Iodide (CsI) based flat panel detector with automatic exposure control (AEC). Parameters surveyed included exposure index (EI), dose area product (DAP) and AEC exposure time. PA and LAT projections of the phantom were then compared to these values. Additionally, the equivalence in millimetres of poly (methyl methacrylate) (PMMA) was established for the different regions of the Lungman phantom (lungs and mediastinum). Finally, a voxel model of the Lungman phantom was developed by the segmentation of a volumetric dataset of the phantom acquired using CT scanning. Subsequently, the model was used in Monte Carlo simulations with PENELOPE/penEasy code to calculate the energy deposited in the organs of the phantom. This enabled comparison of the phantom tissue-equivalent materials with materials defined by ICRP 89 in terms of energy deposition. For the survey data, close agreement was found between phantom and the median values for the patient data (deviations ranged from 4% to 31%, one outlier). The phantom lung region is equivalent to 89 mm to 106 mm of PMMA, depending on tube voltage. Energy deposited in the phantom material compared to those for ICRP defined material differed by at most 36% in AP irradiations and 49% in PA irradiations.

Details

Original languageEnglish
Title of host publicationMedical Imaging 2017: Physics of Medical Imaging
Subtitle of host publicationProceedings of SPIE
Number of pages9
Volume10132
Edition2017
DOIs
Publication statusPublished - 9 Mar 2017
Event2017 - MI17 - SPIE Medical Imaging: The international society for optics and photonics - Renaissance Orlando at Sea World/Orlando, Orlando, United States
Duration: 11 Feb 201716 Feb 2017

Conference

Conference2017 - MI17 - SPIE Medical Imaging
CountryUnited States
CityOrlando
Period2017-02-112017-02-16

Keywords

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

ID: 3943139