Talbot‐Lau grating interferometry enables the use of polychromatic x‐ray sources, extending the range of potential applications amenable to phase contrast imaging. However, these sources introduce beam hardening effects not only from the samples but also from the gratings. As a result, grating inhomogeneities due to manufacturing imperfections can cause spectral nonuniformity artifacts when used with polychromatic sources. Consequently, the different energy dependencies of absorption, phase, and visibility contrasts impose challenges that so far have limited the achievable image quality. The purpose of this work was to develop and validate a correction strategy for grating‐based x‐ray imaging that accounts for beam hardening generated from both the imaged object and the gratings.

中文翻译：

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用于X射线光栅干涉仪（EBHC-GI）的经验性光束硬化和环形伪影校正

Talbot-Lau光栅干涉仪可以使用多色X射线源，从而扩大了适用于相衬成像的潜在应用范围。然而，这些源不仅从样品而且从光栅引入光束硬化效果。结果，当与多色光源一起使用时，由于制造缺陷而导致的光栅不均匀会导致光谱不均匀伪影。因此，吸收，相位和可见性对比的不同能量依赖性带来了挑战，迄今为止，这些挑战已经限制了可实现的图像质量。这项工作的目的是开发和验证基于光栅的X射线成像的校正策略，该策略考虑了从成像对象和光栅产生的光束硬化。