Abstract
We demonstrate depth-resolved absorption imaging by scanning an object through a conical shell of X-rays. We measure ring shaped projections and apply tomosynthesis to extract optical sections at different axial focal plane positions. Three-dimensional objects have been imaged to validate our theoretical treatment. The novel principle of our method is scalable with respect to both scan size and X-ray energy. A driver for this work is to complement previously reported methods concerning the measurement of diffracted X-rays for structural analysis. The prospect of employing conical shell beams to combine both absorption and diffraction modalities would provide enhanced analytical utility and has many potential applications in security screening, process control and diagnostic imaging.
Highlights
Three-dimensional imaging of opaque objects using X-rays is exploited extensively in medicine, industrial inspection and security screening
By considering an incrementally increasing shift value from S = 0 to S = r a zero parallax plane can be observed to translate through the sequence from Z = 0 to Z = L, respectively. These “stationary” planes are an analogue of the optical sections produced by the tomosynthesis analyzed in the following, Section 3.2. 3.2 Optical sections A series of optical sections T, see Fig. 7, have been produced by applying shift-and-add tomosynthesis according to Eqs. (6)-(8)
We demonstrate that X-ray absorption signals can be optically encoded with the shape and location of object features along a conical shell beam
Summary
Three-dimensional imaging of opaque objects using X-rays is exploited extensively in medicine, industrial inspection and security screening. The tomographic approach enables the reconstruction and visualisation of volumetric information from a series of slice images. The shape of flat objects can produce highly attenuated projections in directions at or near the object plane. Under such conditions, the two-dimensional point projections employed typically in tomosynthesis can provide a more complete sampling of flat objects in comparison to CAT, which in contrast requires a 360° rotation about the normal to the X-ray beam [5]
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