(1) Addressed the problem of directly reconstructing an image from a sinogram which has been blurred by a partially-known kernel. (2) A fast DFT-based algorithm was developed for the reconstruction.

M.D. is with the Department of Nuclear Medicine, AZ-VUB, Free University Brussels, Belgium ([email protected]). F.N. is with the Department of Radiology, University of Utah, Salt Lake City ([email protected]) H.K. is with the Department of Information Science and Electronics, University of Tsukuba, Japan ([email protected]) b) Rebinning: estimation of a complete 2D tomographic ...

We present a method to improve the quality of common sinogram restoration algorithms, which are used for metal-artifact reduction in X-ray CT. The presented approach is based on the idea that the intersection length of all beams through the object of interest can approximately be calculated from a preliminary reconstruction of the object. Incorporating this information to the reconstruction all...

In this work we use a wavelet representation of the Algebraic Radon Transfom for reconstructing an image from its sinogram at a controlled level of resolution.

X-ray computed tomography (CT) plays a very important role in daily biomedical practice for diagnosis and therapy, and in materials science for accurate data analysis and quality control. Besides accurate and robust image reconstruction, there is a growing interest in methods for limited angle tomography. The idea is to reduce the X-ray dose delivered to patients or to cope with physical angle ...

This paper presents the experimental part of an investigation on tracking and eliminating organ motion artifacts in x-ray CT cardiac applications with emphasis on imaging coronary calcification. The system methodology consists of a software implementation of the spatial overlap correlator (SSOC) concept in x-ray CT scanners to track the net amplitude and phase of organ motion during the CT data...

In limited angle tomography, only a limited angular range of data is acquired and consequently a double wedgeshaped region in the frequency domain representation of the imaged object is missing. Hence, streak artifacts occur. To restore the missing data, we perform a regression and an image fusion in sinogram domain and frequency domain, respectively. We first convert the sinogram restoration p...