Analysis and Artifact Correction for Volume Correlation Measurements Using Tomographic Images from a Laboratory X-ray Source

Digital volume correlation: what are the limits to the spatial resolution?

“…There is always a compromise between the standard displacement resolution and the spatial resolution (e.g., the size of the interrogation volume), namely, the larger the interrogation volume, the smaller the displacement resolution. This result is very general to many optical techniques utilized to measure kinematic elds, in particular digital image correlation [17,18] and digital volume correlation [19].…”

High Performance Digital Volume Correlation

“…[44], ring artifacts degrade the accuracy of DVC, while beam hardening and its correction had negligible effects. However, more investigation is warranted to assess the impact of the ring artifact reduction on accuracy.…”

“…Instead of defining a regular Cartesian grid, they segment the image to identify individual sand grains and center a subset on each sand grain. They used six translation and rotational DOF, assuming the grains were rigid, and computed DVC for 50,000 grains at 1 second per 27 3 Instead of the subset based DVC presented here, Roux et al introduced a finiteelement based DVC [37,44,67]. This approach defines a finite-element mesh on the image and computes the deformation of the entire mesh at once, instead of computing each subset independently.…”

“…They studied small 100 3 to 288 3 voxel regions using elements from 6 3 to 18 3 voxels. Using this finite-element DVC, Limodin et al [44] studied the effects of CT scanner artifacts and the spurious strain induced by thermal expansion caused by the X-rays in the scanner. Recently, Leclerc et al [41] presented a voxel-scale DVC where the displacement of each voxel is determined (i.e., a subset of size 1) with the addition of the regularization that local behavior is elastic, to make the problem well-posed.…”

Digital volume correlation analyses of synchrotron tomographic images

“…Tomography images are reconstructed from a set of radiographs, a procedure producing artifacts / noise that must be taken into account when digital volume correlation (DVC) measurements are to be performed [9].…”