Abstract
X-ray phase contrast imaging (XPCi) has been the hottest topic in x-ray imaging for over a decade. The excitement originates from the way in which image contrast is generated in XPCi, as this arises from the phase changes that x-rays undergo when crossing an object instead of relying on x-ray absorption. As a consequence, the contrast of all image details is highly enhanced, and features classically considered invisible become detectable. This solves the basic problem of conventional x-ray imaging i.e. poor image contrast arising from small absorption differences. This is extremely important whenever objects that differ little in x-ray absorption from their surrounding background have to be detected, e.g. in diagnostic radiology when soft tissue is imaged. Different XPCi methods were developed, based on free-space propagation, perfect crystals, gratings, etc – all of which are covered by patents which will be reviewed in the present paper. These methods, however, only work with synchrotron radiation (SR), which prevented real-world implementations of XPCi so far. A solution to this problem was developed at UCL, in the shape of a new XPCi approach based on coded apertures. This method is also covered by a patent which will be reviewed in this paper.
Published Version
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