A Phantom Prototype for Electron Density Measurement Using Dual-Energy CT Scanning
CHEN Ting1, WANG Jianjie2, JIN Haoyu3
1.Department of Pharmaceutical Engineering, Guangdong Food and Drug Vocational Technical School, Guangzhou Guangdong
501663, China; 2.School of Biomedical Engineering, Army Medical University, Chongqing 400037, China;
3.School of Medical Devices, Guangdong Food and Drug Vocational College, Guangzhou Guangdong 510520, China
Abstract：Objective Recent studies have demonstrated methodological feasibility and accuracy of relative electron density (RED)
measurement based on a single linear model using dual-energy CT. The purpose of this study is to propose a dedicated phantom to
determine the model coefficients. Methods A CIRS 062 phantom equipped with solutions with different concentrations of a pair of basic
materials, one (pure water and ethanol) interacted with X-ray dominated by Compton scattering and the other with (iodine) photoelectric
effect, was scanned using a Siemens Somatom Definition Flash CT scanner with DECT mode (80 kVp/Sn and 140 kVp/Sn) under a
routine abdominal protocol. Images were analyzed according to the energy-subtracted CT number (ΔHU)–RED conversion method
proposed by Saito (2012). Results For the dedicated phantom and CIRS 062 phantom, the RED determined by DECT images agreed
with the nominal values within 1.75% and 1.31% respectively, and the coefficients of determination for the calculation formula
were both greater than 0.99. Conclusion The dedicated phantom consisted of arbitrary materials with known electricity density and
elemental compositions quite different from those of body tissues, might be used to determine Saito linear model coefficients and
RED measurement.
陈婷1，王建杰2，金浩宇3. 一种专用于双能CT测量电子密度的体模原型[J]. 中国医疗设备, 2018, 33(8): 42-45.
CHEN Ting1, WANG Jianjie2, JIN Haoyu3. A Phantom Prototype for Electron Density Measurement Using Dual-Energy CT Scanning. China Medical Devices, 2018, 33(8): 42-45.
