Intensive computation time is required to simulate images of electronic portal imaging device (EPID) using Monte Carlo (MC) technique, limiting the development of applications associated with EPID, such as mega-voltage cone-beam computed tomography (MV-CBCT). In this study, a fast, accurate simulation strategy for MV-CBCT utilizing the FastEPID technique has been developed and validated. During FastEPID simulation, photon detection was determined by pre-calculated photon energy deposition efficiency ( η ) and particle transport within the EPID was replaced with a pre-calculated optical photon spread function. This method is capable of reducing the time required for EPID image simulation by a factor of 90–140, without compromising image quality. MV-CBCT images reconstructed from the FastEPID simulated projections have been validated against measurement in terms of mean Hounsfield unit (HU), noise, and cupping artifact. These images were obtained with both a Catphan 604 phant...

中文翻译：

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一种用于兆电压锥束计算机断层扫描的快速、准确的图像模拟策略。

使用蒙特卡罗 (MC) 技术模拟电子门户成像设备 (EPID) 的图像需要大量的计算时间，这限制了与 EPID 相关的应用程序的开发，例如兆电压锥束计算机断层扫描 (MV-CBCT)。在这项研究中，已经开发和验证了一种利用 FastEPID 技术的 MV-CBCT 快速、准确的模拟策略。在 FastEPID 模拟过程中，光子检测由预先计算的光子能量沉积效率 (η) 确定，并且 EPID 内的粒子传输被预先计算的光学光子扩散函数取代。这种方法能够将 EPID 图像模拟所需的时间减少 90-140 倍，而不会影响图像质量。从 FastEPID 模拟投影重建的 MV-CBCT 图像已针对平均亨斯菲尔德单位 (HU)、噪声和杯突伪影的测量进行了验证。这些图像是使用 Catphan 604 幻像获得的...