Motion compensated micro-CT reconstruction for in-situ analysis of dynamic processes

Schryver, Thomas De; Dierick, Manuel; Heyndrickx, Marjolein; Stappen, Jeroen Van; Boone, Matthieu N.; Hoorebeke, Luc Van

doi:10.1038/s41598-018-25916-5

Cited by 31 publications

(28 citation statements)

References 47 publications

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“…In contrast, weighted back projection is less suited for dynamic processes which consist mainly of deformation, such as the deformation of foams 8 , since in those cases no static regions can be identified and prior knowledge on locations in the foam can not be used as a 1-to-1 mapping with future locations. As a future prospect, weighted back projection could be combined with motion registration [29][30][31] , deforming not only the volume itself but the weight volume with it, to include more possible applications.…”

Section: Discussionmentioning

confidence: 99%

Improving image quality in fast, time-resolved micro-CT by weighted back projection

Heyndrickx

Bultreys

Goethals

et al. 2020

Sci Rep

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Time-resolved micro-CT is an increasingly powerful technique for studying dynamic processes in materials and structures. However, it is still difficult to study very fast processes with this technique, since fast scanning is typically associated with high image noise levels. We present weighted back projection, a technique applicable in iterative reconstruction methods using two types of prior knowledge: (1) a virtual starting volume resembling the sample, for example obtained from a scan before the dynamic process was initiated, and (2) knowledge on which regions in the sample are more likely to undergo the dynamic process. Therefore, processes on which this technique is applicable are preferably occurring within a static grid. Weighted back projection has the ability to handle small errors in the prior knowledge, while similar 4D micro-CT techniques require the prior knowledge to be exactly correct. It incorporates the prior knowledge within the reconstruction by using a weight volume, representing for each voxel its probability of undergoing the dynamic process. Qualitative analysis on a sparse subset of projection data from a real micro-CT experiment indicates that this method requires significantly fewer projection angles to converge to a correct volume. This can lead to an improved temporal resolution.

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Section: Discussionmentioning

confidence: 99%

Improving image quality in fast, time-resolved micro-CT by weighted back projection

Heyndrickx

Bultreys

Goethals

et al. 2020

Sci Rep

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“…On the hardware side, very fast CT scanning with hundreds of projections per second is enabled by bright X-ray sources such as synchrotrons [De Schryver et al 2018]. This paves the way for mechanical engineering and material science to obtain a better understanding of some dynamic processes.…”

Section: Related Workmentioning

confidence: 99%

“…This paves the way for mechanical engineering and material science to obtain a better understanding of some dynamic processes. Indeed, CT and micro-CT devices are commonly used in these fields to study dynamic experiments like the compression of a composite materials [De Schryver et al 2018;Weißenborn et al 2016], fatigue cracks [Lachambre et al 2015;Morgeneyer et al 2013] or fluid flow in porous media [Shah et al 2016[Shah et al , 2013Shastry et al 2018]. However, even with this fast hardware (which is far from commonly available), the acquisition time is still three orders of magnitude too slow for true video rate volume reconstruction using traditional algorithms, and so better space-time reconstruction algorithms are still highly desirable.…”

Section: Related Workmentioning

confidence: 99%

Warp-and-project tomography for rapidly deforming objects

et al. 2019

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Computed tomography has emerged as the method of choice for scanning complex shapes as well as interior structures of stationary objects. Recent progress has also allowed the use of CT for analyzing deforming objects and dynamic phenomena, although the deformations have been constrained to be either slow or periodic motions. In this work we improve the tomographic reconstruction of time-varying geometries undergoing faster, non-periodic deformations. Our method uses a warp-and-project approach that allows us to introduce an essentially continuous time axis where consistency of the reconstructed shape with the projection images is enforced for the specific time and deformation state at which the image was captured. The method uses an efficient, time-adaptive solver that yields both the moving geometry as well as the deformation field. We validate our method with extensive experiments using both synthetic and real data from a range of different application scenarios.

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“…From this data, an arbitrary number of 3D volumes can be reconstructed using standard reconstruction techniques, each corresponding to a certain time interval and attributed to a certain point in time (usually the middle of the interval). While motion artefacts are inherently present, this acquisition scheme allows for correction methods [20,21] and the possibility for faster scanning allows to minimize these artefacts. This scheme is particularly useful for very fast scanning, e.g., in materials science [22] and can also be combined with gating to investigate even faster processes [23].…”

Section: Introductionmentioning

confidence: 99%

In-Situ X-ray Imaging Of Sublimating Spin-Frozen Solutions

et al. 2020

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Spin-freeze-drying is a promising technique to enable long-term storage of pharmaceutical unit doses of aqueous drug solutions. To investigate the sublimation of the ice during the primary phase of freeze-drying, X-ray imaging can yield crucial temporally resolved information on the local dynamics. In this paper, we describe a methodology to investigate the sublimation front during single unit-dose freeze-drying using 4D in-situ X-ray imaging. Three spin-frozen samples of different solutions were imaged using this methodology and the process characteristics were analysed and reduced to two-dimensional feature maps.

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Motion compensated micro-CT reconstruction for in-situ analysis of dynamic processes

Cited by 31 publications

References 47 publications

Improving image quality in fast, time-resolved micro-CT by weighted back projection

Improving image quality in fast, time-resolved micro-CT by weighted back projection

Warp-and-project tomography for rapidly deforming objects

In-Situ X-ray Imaging Of Sublimating Spin-Frozen Solutions

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