NDLI: List-mode wavelet-based multiresolution image reconstruction for Compton imaging

Content Provider	IEEE Xplore Digital Library
Author	Frandes, M. Maxim, V. Prost, R.
Copyright Year	2009
Description	Author affiliation: University of Lyon, CREATIS-LRMN; CNRS UMR5220; Inserm U630; INSA-Lyon; University of Lyon 1, 69100 Villeurbanne, France (Frandes, M.; Maxim, V.; Prost, R.)
Abstract	Iterative image reconstruction of data measured by a Compton scattering camera has to overcome various difficulties, e.g. a large amount of data, noise arising from both low counts recorded and imaging response, etc. Several approaches were proposed trying to attain an efficient Compton scattered data reconstruction. A forward step is introduction of list-mode data acquisition, which represents an efficient way of measurements allowing to preserve full precision of events as well as to gain computation efficiency. Iterative approaches include e.g. ML based algorithms, Bayesian methods, etc. Image estimation by ML criterion brings noise amplification when an iterative algorithm is applied, so a regularization step is needed. The proposed solution is a regularization technique using wavelet-based thresholding of the OSEM correction factors, called WOSEM. Methods of wavelet thresholding are efficient for edge-preserving image de-noising. The threshold used depends on the wavelet decomposition level. The method is illustrated by computer experiments.
Starting Page	3781
Ending Page	3785
File Size	175905
Page Count	5
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401889
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image resolution Image reconstruction Scattering Iterative algorithms Noise measurement Cameras Data acquisition Gain measurement Iterative methods Bayesian methods List-Mode algorithms Compton imaging Multiresolution Wavelet thresholding
Content Type	Text
Resource Type	Article

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