In the past few years, dynamic computed tomography (CT) approaches or uninterrupted acquisitions of deforming materials have rapidly emerged as an essential technique to understand material evolution, facilitating in situ investigations ranging from mechanical deformation to fluid flow in porous materials and beyond. Developments at synchrotron facilities have led this effort, pointing to the future of the technique. In the laboratory, recent developments at TESCAN XRE have made it possible to image, reconstruct and inspect dynamic processes in the laboratory with a temporal resolution below 10 s, meaning that an entire acquisition from 0 to 360° is completed within 10 s. The aim of this study is to explore the challenges and innovations that have led to the ability to perform high speed, dynamic acquisitions. A unique horizontally rotating gantry based micro‐CT system was developed to facilitate complex in situ experiments. In doing so, the sample stays fixed while source and detector are uninterruptedly rotating around a vertical axis. In this work, the dynamic CT method with this rotating gantry based system will be described by two application examples: (1) deformation and collapse of a delicate beer foam and (2) in situ baking process of pastry. For the pastry baking process, an oven was needed to reach baking temperature. In a conventional micro‐CT system, where the sample rotates, it is not so obvious to rotate an oven with sensor and heating cables. On the other hand, the delicate foam of a collapsing beer head is able to rotate, but because of the tangential convection during fast rotation (<10 s), it could influence the bubble detachment and liquid drainage and thus also the foam degradation. To investigate both processes, a horizontally rotating gantry based micro‐CT is required. For both examples it was possible to quantify the key parameters such as pore size and distribution to better understand the rise and fall of porous foams. These examples will highlight the recent progress in adapting micro‐CT workflows to accommodate uninterrupted imaging of dynamic events and point to opportunities for future continued development.

中文翻译：

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基于实验室的动态微 CT 的创新，以加速原位研究

在过去几年中，动态计算机断层扫描 (CT) 方法或变形材料的不间断采集已迅速成为了解材料演化的重要技术，促进了从机械变形到多孔材料中流体流动等的原位研究。同步加速器设施的发展引领了这项工作，指出了该技术的未来。在实验室中，TESCAN XRE 的最新发展使得在实验室中以低于 10 秒的时间分辨率对动态过程进行成像、重建和检查成为可能，这意味着从 0 到 360° 的整个采集可在 10 秒内完成。本研究的目的是探索导致执行高速、动态收购的能力的挑战和创新。开发了一种独特的基于水平旋转机架的微 CT 系统，以促进复杂的原位实验。这样做时，样品保持固定，而源和检测器围绕垂直轴不间断地旋转。在这项工作中，将通过两个应用示例来描述使用这种基于旋转机架的系统的动态 CT 方法：（1）精致啤酒泡沫的变形和坍塌；（2）糕点的原位烘焙过程。对于糕点烘焙过程，需要一个烤箱来达到烘焙温度。在样品旋转的传统微 CT 系统中，旋转带有传感器和加热电缆的烤箱并不那么明显。另一方面，倒塌的啤酒头的细腻泡沫能够旋转，但由于快速旋转（<10 秒）期间的切向对流，它会影响气泡分离和液体排放，从而影响泡沫降解。为了研究这两个过程，需要一个基于水平旋转机架的微 CT。对于这两个示例，都可以量化关键参数，例如孔径和分布，以更好地了解多孔泡沫的上升和下降。这些示例将突出最近在调整显微 CT 工作流程以适应动态事件的不间断成像方面取得的进展，并指出未来持续发展的机会。