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X-ray images are often of low contrast due to the subtle distinction of attenuation coefficients and scatter effect, which makes it difficult to distinguish signals from background. This paper proposes an image enhancement algorithm using the multi-scale dyadic wavelet transform. The algorithm...
We present a sinogram inpainting approach for X-ray computed tomography (CT) with the intent of reducing metal artifacts, where "inpainting" is a synonym for "image interpolation". Metal artifacts arise in CT when rays traverse the high attenuating objects such as metal bodies and portions of...
In this paper, we propose a helical cone-beam scanning configuration of triple symmetrically located X-ray sources, and study minimum detection windows to extend the traditional Tam-Danielsson window for exact image reconstruction. For three longitudinally displaced scanning helices of the same...
In this paper, variable pitch helical cone-beam CT is studied. We prove a sufficient condition for the existence of PI-lines inside this variable pitch helix. Under this condition, we propose a new scanning configuration, called a spring scan, which can be used to scan a cylindrical object...
In practical applications of tomographic imaging, there are often challenges for image reconstruction due to under-sampling and insufficient data. In computed tomography (CT), for example, image reconstruction from few views would enable rapid scanning with a reduced x-ray dose delivered to the...
In radiographic imaging, the modulation transfer function (MTF), the noise power spectrum (NPS), and the detective quantum efficiency (DQE) are usually determined and expressed as functions of spatial frequency in the detector plane. Values thus specified would be insufficient for describing the...
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