Magnin Clara, Fernández Martínez Manuel, Mihai Cenda Dan, Lantz Blandine, Barton Scott, Faure Bertrand, Brun Emmanuel
Univ. Grenoble Alpes, Inserm UA7, Strobe, Grenoble, France.
Xenocs SAS, Grenoble, France.
J Appl Crystallogr. 2025 Jun 20;58(Pt 4):1347-1354. doi: 10.1107/S1600576725004017. eCollection 2025 Aug 1.
Dark-field (DF) imaging is a recent X-ray imaging modality which is promising because it gives access to information not resolved in conventional transmission X-ray imaging. The DF technique was first introduced as a loss of visibility of the grating interferometry modulations. DF signal is now measured with all the different X-ray phase contrast setups such as beam tracking or modulation-based imaging. Using a dedicated setup [Magnin (2023). , 5839-5842], we present in the present article combined measurements of small-angle X-ray scattering and DF signal on the same material. We confirm that DF imaging is sensitive to multiple refraction from a sample, as can be found in the literature on lung imaging, but we show that the DF signal is also sensitive to scattering events. Finally, we measure a porous membrane that creates both types of signal (scattering and refraction), showing that, contrary to existing models, it is difficult to be quantitative about DF.
暗场（DF）成像作为一种新型的X射线成像方式，因其能够获取传统透射X射线成像中无法分辨的信息而备受关注。DF技术最初是作为光栅干涉调制可见度的损失而引入的。目前，在所有不同的X射线相衬成像设置中，如光束跟踪或基于调制的成像中，都可以测量DF信号。通过使用一种专门的设置[Magnin（2023），5839 - 5842]，我们在本文中展示了在同一种材料上同时进行小角X射线散射和DF信号的测量。我们证实，正如在肺部成像文献中所发现的那样，DF成像对样品的多次折射敏感，但我们也表明DF信号对散射事件同样敏感。最后，我们测量了一种能同时产生两种信号（散射和折射）的多孔膜，这表明，与现有模型相反，很难对DF进行定量分析。
