PURPOSE An iterative edge-preserving CT reconstruction algorithm for high-resolution imaging of small regions of the field of view is investigated. It belongs to a family of region-of-interest reconstruction techniques in which a low-cost pilot reconstruction of the whole field of view is first performed and then used to deduce the contribution of the region of interest to the projection data. ...

UNLABELLED This article demonstrates resolution recovery in 18F SPECT image reconstruction by using an iterative algorithm that corrects for the system geometric response. METHODS Patient and phantom studies were performed using a Picker PRISM 3000 three-detector SPECT system (Picker International, Inc., Cleveland, OH) to image 18F with 511 keV collimators. A measured point response function ...

Algebraic reconstruction techniques (ART) are iterative procedures for reconstructing objects from their projections. It is proven that ART can be computationally efficient by carefully arranging the order in which the collected data are accessed during the reconstruction procedure and adaptively adjusting the relaxation parameters. In this paper, an adaptive algebraic reconstruction technique ...

INTRODUCTION: The reconstruction of sensitivity–encoded non–Cartesian undersampled MRI has been facilitated by the use of iterative techniques [1]. However, the ill-conditioning of the associated inverse problem produces residual aliasing and noise amplification. A proven approach to stabilize the reconstruction and to diminish these effects is the use of explicit regularization methods [2-3], ...

We discuss computing issues for data analysis and image reconstruction of PET-TOF medical scanner or other medical scanning devices producing large volumes of data. Service architecture based on the grid and cloud concepts for distributed processing is proposed and critically discussed.

Land-sea contamination observed in SMOS (Soil Moisture and Ocean Salinity) brightness temperature images is found to have two main contributions: the floor error inherent of image reconstruction and a multiplicative error either in the antenna temperature or in the visibility samples measured by the correlator. The origin of this last one is traced down to SMOS calibration parameters to yield a...

In this chapter, we introduce a range of tomography problems, including Xray imaging, limited data problems, electron microscopy and radar imaging. We are interested in the recovery of the singular features of the medium or object rather than exact inversion formulas. Toward this end, we show how microlocal analysis helps researchers understand the strengths and limitations inherent in the reco...