Fig. 4: Dark-field and conventional chest X-rays of healthy and COVID-19-infected subjects.
From: Dark-field chest X-ray imaging for the assessment of COVID-19-pneumonia
a Dark-field and b conventional (attenuation-based) chest radiographs of a healthy subject. The dark-field radiograph exhibits a strong, homogeneous dark-field signal. The respective attenuation-based image shows no apparent pathology. c Dark-field and d attenuation-based chest radiographs of a patient infected with COVID-19. Compared to the healthy subject, the infected patient shows an overall decrease of signal intensity. While the signal of the healthy subject is homogeneous, the dark-field signal of the infected patient appears inhomogeneous and patchy, especially in the periphery of the lung (arrowheads). e–g Additional exemplary dark-field radiographs of healthy subjects, h–j, respective attenuation-based radiographs. k–v More exemplary dark-field and respective attenuation-based images of patients infected with COVID-19. k–m, Dark-field images with a generally reduced signal intensity. q-s, Dark-field images with a rather inhomogeneous, patchy texture, predominantly in the periphery. n–p and t–v respective attenuation-based images in comparison, in which it is rather difficult to impossible to detect COVID-19-pneumonia.
