9 March 2017 X-ray vector radiography of a human hand
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Abstract
Grating based x-ray phase-contrast reveals differential phase-contrast (DPC) and dark-field contrast (DFC) on top of the conventional absorption image. X-ray vector radiography (XVR) exploits the directional dependence of the DFC and yields the mean scattering strength, the degree of anisotropy and the orientation of scattering structures by combining several DFC-projections. Here, we perform an XVR of an ex vivo human hand specimen. Conventional attenuation images have a good contrast between the bones and the surrounding soft tissue. Within the bones, trabecular structures are visible. However, XVR detects subtler differences within the trabecular structure: there is isotropic scattering in the extremities of the phalanx in contrast to anisotropic scattering in its body. The orientation changes as well from relatively random in the extremities to an alignment along the longitudinal trabecular orientation in the body. In the other bones measured, a similar behavior was found. These findings indicate a deeper insight into the anatomical configuration using XVR compared to conventional radiography. Since microfractures cause a discontinuous trabecular structure, XVR could help to detect so-called radiographically occult fractures of the trabecular bones.
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Christoph Jud, Christoph Jud, Eva Braig, Eva Braig, Martin Dierolf, Martin Dierolf, Elena Eggl, Elena Eggl, Benedikt Günther, Benedikt Günther, Klaus Achterhold, Klaus Achterhold, Bernhard Gleich, Bernhard Gleich, Ernst Rummeny, Ernst Rummeny, Peter Noël, Peter Noël, Franz Pfeiffer, Franz Pfeiffer, Daniela Münzel, Daniela Münzel, } "X-ray vector radiography of a human hand", Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101325U (9 March 2017); doi: 10.1117/12.2255595; https://doi.org/10.1117/12.2255595
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