The x-ray video room is situated in the basement, and is shielded by 0.5 mm lead equivalent in the walls and ceiling. The system is controlled from panels behind lead-glass windows.
Proper alignment between the x-ray beam and the image intensifier screen is obtained by back-reflecting a point laser that shines perpendicular away from the image intensifier's input screen to a mirror attached in front of the collimator.
Images of punctured aluminium grids can be used to correct for distortion artefacts using XMA-lab software.
Spatial resolution of the x-ray images is between 2.2 line pairs per mm (large view mode) and 4.5 line pairs per mm (small view mode).
Two 3D calibration objects designed for usage with XMA-lab software are available. The coordinate specification files (.csv), and symbol reference file (.ref) can be found below.
download lego_large.csv, download lego_small.csv, download refsymbols.txt (best rename to .ref)
Notes on how to combine X-ray calibration with 'normal' light camera calibration can be found under '3D Kinematics'.
The spatial accuracy of 3D tracking of radio-opaque spheres, estimated from the variation in the calculated distance between two spheres on a rigid object moving around in the 3D-space, is about 0.1 mm.