Fig. 2

Conventional x-ray (window level 4.05, window width 1.1) (a) and dark-field radiograph (window level 0.8, window width 2.0) (b), and coronal computed tomography reconstruction (c) of the pelvic region. The red arrows mark an area with subchondral sclerosis as a cause of bilateral osteoarthritis of the hips. These areas exhibit an increased signal at both modalities. Whereas the increased attenuation signal is due to the associated thickening of the bone structure, the increased dark-field signal can be attributed due to spectral hardening effects as well as increased small-angle scatter