Algorithms for joint activity–attenuation estimation from positron emission tomography scatter

Positron emission tomography partial volume correction: estimation and algorithms.

Partial volume effects in positron emission tomography (PET) lead to quantitative under- and over-estimations of the regional concentrations of radioactivity in reconstructed images and corresponding errors in derived functional or parametric images. The limited resolution of PET leads to "tissue-fraction" effects, reflecting underlying tissue heterogeneity, and "spillover" effects between regi...

Reconstruction-Based Estimation of the Scatter Component in Positron Emission Tomography

Received 12/27/2000; revised 2/26/2001; accepted 3/14/2001. For correspondence or reprints contact: Habib Zaidi, Ph.D., Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva, Switzerland. Tel: 41 22 372 72 58, Fax: 41 22 372 71 69, E-mail: [email protected] A new method to assess the scatter component in positron emission tomography (PET) based on estimating the low-freque...

Scatter correction for positron emission mammography.

In this paper we present a scatter correction method for a regularized list mode maximum likelihood reconstruction algorithm for the positron emission mammograph (PEM) that is being developed at our laboratory. The scatter events inside the object are modelled as additive Poisson random variables in the forward model of the reconstruction algorithm. The mean scatter sinogram is estimated using ...

Maximum Likelihood Algorithms for Image Reconstruction in Positron Emission Tomography

Reconstruction Algorithms for Positron Emission Tomography and Single Photon Emission Computed Tomography and their Numerical Implementation

The modern imaging techniques of Positron Emission Tomography and of Single Photon Emission Computed Tomography are not only two of the most important tools for studying the functional characteristics of the brain, but they now also play a vital role in several areas of clinical medicine, including neurology, oncology and cardiology. The basic mathematical problems associated with these techniq...