Development and verification of a novel system for computed tomography scanner model construction in Monte Carlo simulations

Liu Ying; Meng Ting; Zhang Haowei; Su Qi; Yan Hao; Lu Heqing

doi:10.1016/j.net.2022.07.004

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자료유형: 학술저널

저자정보: Liu Ying (University of Shanghai for Science and Technology) Meng Ting (University of Shanghai for Science and Technology) Zhang Haowei (University of Shanghai for Science and Technology) Su Qi (Department of Medical Equipment, Shanghai First Maternity and Infant Hospital, School of Medicine,) Yan Hao (Department of Medical Equipment, Shanghai First Maternity and Infant Hospital, School of Medicine,) Lu Heqing (Department of Medical Equipment, Shanghai First Maternity and Infant Hospital, School of Medicine,)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제11호

발행연도: 2022.11

수록면: 4,244 - 4,252 (9page)

DOI: 10.1016/j.net.2022.07.004

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The accuracy of Monte Carlo (MC) simulations in estimating the computed tomography radiation dose is highly dependent on the accuracy of CT scanner model. A system was developed to observe the 3D model intuitively and to calculate the X-ray energy spectrum and the bowtie (BT) filter model more accurately in Monte Carlo N-particle (MCNP). Labview's built-in Open Graphics Library (OpenGL) was used to display basic surfaces, and constructive solid geometry (CSG) method was used to realize Boolean operations. The energy spectrum was calculated by simulating the process of electronic shooting and the BT filter model was accurately modeled based on the calculated shape curve. Physical data from a study was used as an example to illustrate the accuracy of the constructed model. RMSE between the simulation and the measurement results were 0.97% and 0.74% for two filters of different shapes. It can be seen from the comparison results that to obtain an accurate CT scanner model, physical measurements should be taken as the standard. The energy spectrum library should be established based on Monte Carlo simulations with modifiable input files. It is necessary to use the three-segment splicing modeling method to construct the bowtie filter model.

#Monte Carlo simulations #CT scanner model #Energy spectrum #BT filter

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