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首页> 外文期刊>Computer Methods and Programs in Biomedicine: An International Journal Devoted to the Development, Implementation and Exchange of Computing Methodology and Software Systems in Biomedical Research and Medical Practice >CTmod-A toolkit for Monte Carlo simulation of projections including scatter in computed tomography.
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CTmod-A toolkit for Monte Carlo simulation of projections including scatter in computed tomography.

机译：CTmod-A工具包，用于蒙特卡罗模拟投影，包括计算机断层扫描中的散射。

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摘要

The CTmod toolkit is a set of C++ class libraries based on the CERN's application development framework ROOT. It uses the Monte Carlo method to simulate energy imparted to a CT-scanner detector array. Photons with a given angle-energy distribution are emitted from the X-ray tube approximated by a point source, transported through a phantom, and their contribution to the energy imparted per unit surface area of each detector element is scored. Alternatively, the scored quantity may be the fluence, energy fluence, plane fluence, plane energy fluence, or kerma to air in the center of each detector element. Phantoms are constructed from homogenous solids or voxel arrays via overlapping. Implemented photon interactions (photoelectric effect, coherent scattering, and incoherent scattering) are restricted to the energy range from 10 to 200keV. Variance reduction techniques include the collision density estimator and survival biasing combined with the Russian roulette. The toolkit has been used to estimate theamount of scatter in cone beam computed tomography and planar radiography.
机译：CTmod工具箱是基于CERN应用程序开发框架ROOT的一组C ++类库。它使用蒙特卡洛方法模拟传递给CT扫描仪探测器阵列的能量。具有给定角度能量分布的光子从点光源近似的X射线管中发射出来，并通过体模传输，并对它们对每个检测器元件的单位表面积所赋予的能量的贡献进行评分。替代地，计分的量可以是每个检测器元件的中心中的通量，能量通量，平面通量，平面能量通量或比释能。幻影是由均质的实体或体素阵列通过重叠构造而成的。实现的光子相互作用（光电效应，相干散射和非相干散射）被限制在10keV至200keV的能量范围内。减少方差的技术包括碰撞密度估算器和生存偏差与俄罗斯轮盘赌相结合。该工具包已用于估计锥束计算机断层扫描和平面射线照相中的散射量。

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