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While in situ experiments are gaining importance for the (mechanical)assessment of metamaterials or materials with complex microstructures, imagingconditions in such experiments are often challenging. The lab-based computedtomography system Xradia 810 Ultra allows for the in situ (time lapsed)mechanical testing of samples. However, the in situ loading setup from thissystem limits the image acquisition angle to 140$^\circ$. For low contrastpolymeric materials, this limited acquisition angle leads to regions of lowinformation gain, thus preventing an accurate reconstruction of the data usinga filtered back projection algorithm. Here we demonstrate how the informationgain can be improved by selecting an appropriate position of the sample. A lowcontrast polymeric tetrahedral microlattice sample and a specificallystructured sample, both scanned over 140$^\circ$ and 180$^\circ$, demonstratethat the missing structural details in the 140$^\circ$ reconstruction arelimited to an angular wedge of about 20$^\circ$. Depending on the samplegeometry and structure, applying simple strategies for the in situ experimentsallows accurate reconstruction of the data. For the tetrahedral microlattice, asimple rotation of the sample by 90$^\circ$ provides enough X-ray absorptionfor an accurate reconstruction of the geometry.

Dealing with missing angular sections in nanoCT reconstructions of low contrast polymeric samples employing a mechanical in situ loading stage