Parametric VOIs

There are various ways to create parametric series of volumes of interests (VOIs). These VOIs could be overlapping, or may require a fixed margin between them, and the size could be fixed or a percentage of the image size. The VOIs can be arranged in a uniform grid or using custom formula calculations with values from a Parameter matrix. Each VOI can be evaluated in a separately spawned run.

VOI Grids

Lucid.Util.SpawnVOIGrid can be used to arrange VOIs in uniform grids with overlaps or margins. Such a partitioning of images into a grid of cubic region allows systematic investigation of spatial dependencies.

Representative Volume Element Analysis

When quantifying microstructural material properties if can be crucial to perform a Representative Volume Element (RVE) analysis. The workflow Workflow.Example.RVE allows specifying a range of volume percentages to explore, and automatically generates multiple analysis runs, each corresponding to a different volume element size within the defined range. For example regions of constant length, constant area, or centered cuboids can be evaluated. Once all volume elements are analyzed, a table report summarizing the parameter values for each volume element size allows using Lucid.Statistics.RVE to plot the quantified parameter against the volume, to determine the RVE by identifying the volume at which the parameter converges within a user-defined relative error threshold. This convergence indicates that the selected volume is sufficiently representative of the material’s overall behavior. This automated workflow enables efficient and reliable determination of RVE size.