Motion correction for slot scanners via simultaneous depth imaging

Slot scanning X-ray systems such as DXA and EOS provide low-dose high-contrast images of internal anatomy. The advantages of these devices are offset by an inherent susceptibility to motion artefact, as images are collected line-by-line. We present a novel method to measure patient motion and correct DICOM images post-hoc: small depth cameras are added to the scan environment to capture 3D surface data simultaneous with X-ray imaging. Radiographic images are then “unwarped” to compensate for detected motion. Motion correction is evaluated using radiopaque markers with known geometry: RMS error is reduced by ~48% in both 3D reconstructions and 2D projections.