Fig. 4
Dark-field chest radiograph, conventional x-ray, and CT of human body 4. Median visual grading (encircled numbers) of dark-field chest radiograph (a) by three independent readers shows increasing dark-field signal from the apex to the base of the lung. Median visual grading of transmission in conventional x-ray (b) shows no difference between upper, middle, and lower zones. Sagittal (c, e) and coronal (d) CT images show regular ventilation of emphysematous lung parenchyma except from some minor subpleural dystelectasis (red arrows) in posterior lower lobes. Asterisk marks the location of the endotracheal tube, which was repositioned between x-ray dark-field/conventional x-ray imaging and CT