标题： 基于边缘照明的相衬成像蒙特卡罗模拟的虚拟光栅方法 显示英文标题

标题： Virtual grating approach for Monte Carlo simulations of edge illumination-based x-ray phase contrast imaging

摘要： 新型x射线相位对比成像装置的设计通常依赖于蒙特卡罗模拟来进行参数研究。虽然蒙特卡罗模拟以准确性著称，但其耗时特性导致了较长的模拟时间，尤其是在需要大量参数变化的情况下。对于依赖吸收掩模或光栅且具有多种可调属性（如周期、孔径大小和厚度）的成像方法来说，这种情况尤为明显。在这项工作中，我们提出了虚拟光栅方法来克服这一局限性。通过在模拟中用虚拟光栅替代实际光栅，可以在模拟之后更改光栅参数，从而显著减少总体模拟时间。该方法通过与显式光栅模拟的比较进行了验证，并随后展示了代表性演示案例。 显示英文摘要

摘要： The design of new x-ray phase contrast imaging setups often relies on Monte Carlo simulations for prospective parameter studies. Monte Carlo simulations are known to be accurate but time consuming, leading to long simulation times, especially when many parameter variations are required. This is certainly the case for imaging methods relying on absorbing masks or gratings, with various tunable properties, such as pitch, aperture size, and thickness. In this work, we present the virtual grating approach to overcome this limitation. By replacing the gratings in the simulation with virtual gratings, the parameters of the gratings can be changed after the simulation, thereby significantly reducing the overall simulation time. The method is validated by comparison to explicit grating simulations, followed by representative demonstration cases.