A preliminary study of characteristics of cross scattering for multi‐source cone‐beam CT

作者：Wenxin Deng, S. Tian, Jiancong Dai, Jing Kang, Ting He, Linghong Zhou, Xin Kang, Jianhui Ma, Yuan Xu · 发表于：Medical Physics · 年份：2025 · DOI：10.1002/mp.70133 · 研究领域：Medical Imaging Techniques and Applications、Digital Radiography and Breast Imaging、Dental Radiography and Imaging

BACKGROUND: The development of multi-source cone-beam computed tomography (CBCT) systems has significantly improved imaging speed, making them crucial in various clinical and research applications, particularly in dynamic studies. However, the simultaneous exposure of multiple X-ray sources increases the complexity of scatter within the system. The detector receives not only forward scattering from the directly aligned source but also cross scattering from other sources. Traditional scatter correction methods are mainly designed for single-source or dual-source CT, which often fail to address the challenges posed by multi-source scenario. PURPOSE: The purpose of this work is to proposes a GPU-based Monte Carlo (MC) simulation method to accurately model and analyze the scatter distribution and the characteristics of different components in multi-source CBCT systems, as well as the impact of cross scattering on image reconstruction quality. METHODS: We utilize the GPU-based MC package gMCDRR to simulate multi-source CBCT system, including both flat-panel and spherical detector configurations. The simulation process consists of three main components: imaging system modeling, photon initialization, and the simulation of physical interactions in phantom. The whole process of photon interaction with the geometry and its arrival at the detector is simulated in parallel using multiple GPU cores to enhance computational efficiency. We compare the proposed method with Geant4 method to ...