IVe present, an efficient algorithm for computation of the maximum likelihood estimate of the location of a known target, from short. pulse scatter data. The algorithm consitutes a three step procedure: (i) data filtering. (ii) time-domain backpropagation. and (iii) coherent. summation and consists of a number of projection and backprojection operations int,egrated in a tomographic scheme. .A c...

An investigation was performed of the changes in image quality and patient dose as a result of increasing filtration for fluoroscopy performed under automatic brightness control. Filtration was added either at the x-ray tube housing (i.e., scatter-free geometry) or adjacent to a tissue equivalent phantom simulating the patient (i.e., with-scatter geometry). Patient doses were expressed in terms...

Compton scattering is one of the main causes of image degradation in X-ray imaging. This is particularly noticeable in mammography where details of interest feature low contrast in comparison to the surrounding tissue. This work shows the feasibility of obtaining scatter-free images by using a quasimonochromatic X-ray beam and a pixellated spectroscopic detector. This work presents characterisa...

A three-dimensional reconstruction method for simultaneous compensation of attenuation, scatter and distance-dependent detector response for single photon emission computed tomography is described and tested by experimental studies. The method determines the attenuation factors recursively along each projection ray starting at the intersected source voxel closest to the detector. The method sub...

The qualitative and quantitative accuracy of SPECT images is degraded by physical factors of attenuation, Compton scatter and spatially varying collimator geometric response. This paper presents a 3D ray-tracing technique for modelling attenuation, scatter and geometric response for SPECT imaging in an inhomogeneous attenuating medium. The model is incorporated into a three-dimensional projecto...

The DMD (Digital Micromirror Device) has an important future in both ground and space based multi-object spectrometers. A series of laboratory measurements have been performed to determine the scattered light properties of a DMD. The DMD under test had a 17 m pitch and 1 m gap between adjacent mirrors. Prior characterization of this device has focused on its use in DLP (TI Digital Light Process...

introduction: scattered photon is one of the main defects that degrade the quality and quantitative accuracy of nuclear medicine images. accurate estimation of scatter in projection data of spect is computationally extremely demanding for activity distribution in uniform and non-uniform dense media. methods: the objective of this paper is to develop and validate a scatter correction technique t...

This paper addresses the problem of selecting measurement data types suitable for image reconstruction in optical tomography. The principal problem is the necessity to simultaneously reconstruct both the absorption and scatter distribution within an object. This can lead to ambiguities between these two parameters, and result in cross-talk and image artefact. A single-perturbation test problem ...

Background Scatter-hoarding animals store food in multiple locations within their home range and rely on spatial memory for subsequent localization retrieval. The relationship between scatter-hoarding behavior has been widely demonstrated, but the association of gut microbiota with seed-hoarding remains unclear. Methods In this study, by using enclosure tests, tests including an object location...

Cone Beam Computerized Tomography (CBCT) enables threedimensional imaging with isotropic resolution. X-ray scatter management is a challenging task for quantitative CBCT imaging : scattered radiation level is significantly high on cone beam systems compared to collimated fan beam systems. The effects of this scattered radiation are cupping artifacts, streaks, and quantification inaccuracies. At...