Phase contrast imaging

摘要

X-ray devices for Phase Contrast Imaging (PCI) are often built up with the help of gratings. For large field-of-views (FOV), production cost and complexity of these gratings could increase significantly as they need to have a focused geometry. Instead of a pure PCI with a large FOV, this invention suggests to combine a traditional absorption X-ray-imaging system with large-FOV with an insertable low-cost PCI system with small-FOV, The invention supports the user to direct the PCI system with reduced FOV to a region that he regards as most interesting for performing a PCI scan thus eliminating X-ray dose exposure for scanning regions not interesting for a radiologist. The PCI scan may be generated on the basis of local tomography.

主权项

1. A device for phase contrast imaging of an object, the device comprising:
first, second, and third independently movable sliders; a source connected to the first slider and configured to issue an X-ray beam having an optical axis for producing absorption-based and phase contrast images; a detector connected to the second slider and configured to detect the X-ray beam; and a grating arrangement including a plurality of gratings connected to the third slider between the object and the source and between the object and the detector for moving out of the optical axis of the X-ray beam to produce the absorption-based images, and within the optical axis of the X-ray beam to produce phase contrast images; an input device configured to select a region-of-interest within the absorption-based image; a variable aperture configured to adapt a field-of-view of the X-ray beam to the region-of-interest on the phase contrast images.