Projection-reconstruction NMR experiments have been shown to significantly reduce the acquisition time required to obtain protein backbone assignment data. To date, this concept has only been applied to smaller (15)N/(13)C-labeled proteins. Here, we show that projection-reconstruction NMR techniques can be extended to larger protonated and perdeuterated proteins. We present a suite of (4,2)D tr...

Götz, Druckmüller, and, independently, Brady have defined a discrete Radon transform (DRT) that sums an image's pixel values along a set of aptly chosen discrete lines, complete in slope and intercept. The transform is fast, O(N2log N) for an N x N image; it uses only addition, not multiplication or interpolation, and it admits a fast, exact algorithm for the adjoint operation, namely backproje...

State-of-the-art reconstruction algorithms for medical helical cone-beam Computed Tomography (CT) are of type non-exact Filtered Backprojection (FBP). They are attractive because of their simplicity and low computational cost, but they produce sub-optimal images with respect to artifacts, resolution, and noise. This thesis deals with possibilities to improve the image quality by means of iterat...

This paper evaluates the final reconstruction quality of 3D objects from different reconstruction methods by comparing rendered views of a 3D model to the original views, initially taken from 2D cameras. The paper uses pixel-by-pixel error measures, like pixelwise reconstruction error for non-textured objects and PSNR values for colored or textured objects. Concurrently, the limitations of such...

UNLABELLED The purpose of this study was to compare a routine bone SPECT/CT protocol using CT reconstructed with filtered backprojection (FBP) with an optimized protocol using low-dose CT images reconstructed with adaptive statistical iterative reconstruction (ASiR). METHODS In this prospective study, enrolled patients underwent bone SPECT/CT, with 1 SPECT acquisition followed by 2 randomized...

In this paper, we address the problem of two-dimensional image reconstruction from fan-beam data acquired along a full 2pi scan. Conventional approaches that follow the filtered-backprojection (FBP) structure require a weighted backprojection with the weight depending on the point to be reconstructed and also on the source position; this weight appears only in the case of divergent beam geometr...

A method is proposed for reconstructing images from tomographic data with respect to a two-dimensional wavelet basis. The Wavelet-Vaguelette Decomposition is used as a framework within which expressions for the necessary wavelet coe cients may be derived. These coe cients are calculated using a version of the ltered backprojection algorithm, as a computational tool, in a multiresolution fashion...

In this article, we consider the problem of inverting exponential Radon transform a function in presence noise. We propose kernel estimator to estimate true function. Such an is closely related filtered backprojection type inversion formulas noise-less setting. For proposed then show that convergence at minimax optimal rate.