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We integrate a small and portable medical x-ray device with mechanicaltesting equipment to enable in-situ, non-invasive measurements of a granularmaterial's response to mechanical loading. We employ an orthopedic C-arm as thex-ray source and detector to image samples mounted in the materials tester. Wediscuss the design of a custom rotation stage, which allows for sample rotationand tomographic reconstruction under applied compressive stress. We thendiscuss the calibration of the system for 3d computed tomography, as well asthe subsequent image reconstruction process. Using this system to reconstructpackings of 3d-printed particles, we resolve packing features with 0.52 mmresolution in a (60 mm)$^3$ field of view. By analyzing the performance boundsof the system, we demonstrate that the reconstructions exhibit only moderatenoise.

X-ray tomography system to investigate granular materials during mechanical loading