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19 March 2014Acquiring tomographic images from panoramic X-ray scanners
We propose a new method to acquire three-dimensional tomographic images of a large object from a dental panoramic
X-ray scanner which was originally designed to produce a panoramic image of the teeth and jaws on a single frame. The
method consists of two processes; (i) a new acquisition scheme to acquire the tomographic projection data using a
narrow detector, and (ii) a dedicated model-based iterative technique to reconstruct images from the acquired projection
data. In conventional panoramic X-ray scanners, the suspension arm that holds the X-ray source and the narrow detector
has two moving axes of the angular movement and the linear movement. To acquire the projection data of a large object,
we develop a new data acquisition scheme that can emulate an acquisition of the projectional view in a large detector by
stitching narrow projection images, each of which is formed by a narrow detector, and design a trajectory to move the
suspension arm accordingly. To reconstruct images from the acquired projection data, an accelerated model-based
iterative reconstruction method derived from the ordered subset convex maximum-likelihood expectation-maximization
algorithm is used. In this method each subset of the projection data is constructed by collecting narrow projection images
to form emulated tomographic projectional views in a large detector. To validate the performance of the proposed
method, we tested with a real dental panoramic X-ray system. The experimental results demonstrate that the new method
has great potential to enable existing panoramic X-ray scanners to have an additional CT’s function of providing useful
tomographic images.
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Van-Giang Nguyen, Soo-Jin Lee, "Acquiring tomographic images from panoramic X-ray scanners," Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90332W (19 March 2014); https://doi.org/10.1117/12.2043232