NDLI: Multiresolution expectation maximization reconstruction algorithm for positron emission tomography using wavelet processing

Content Provider	IEEE Xplore Digital Library
Author	Raheja, A. Doniere, T.F. Dhawan, A.P.
Copyright Year	1963
Abstract	The expectation maximization (EM) algorithm and its derivatives have been applied to the problem of image reconstruction in positron emission tomography (PET). The multigrid EM (MGEM) algorithm uses the EM algorithm on a set of reconstruction grids with different resolutions. This paper introduces a multiresolution EM (MREM) algorithm that extends the MGEM algorithm to both the image reconstruction and the detector space. The detectors comprising the ring are reorganized to form a multiresolution detector space. The algorithm begins iterating at the coarsest grid level using tube data that has been re-binned at the coarsest detector level. It switches both the grid and detector levels simultaneously until the finest detector resolution is reached. The algorithm iterates further for various multiresolution grid levels using the tube data at the finest detector resolution. This method provides faster convergence and better reconstruction than the conventional single-grid EM (SGEM) algorithm. The MREM algorithm uses a new transition criterion for switching the grid levels, which is developed using the high-frequency energy derived from the wavelet decomposition of the reconstructed image at each iteration. It also uses a wavelet spline interpolation method to project the intermediate reconstruction from a specific grid level to the next finer grid. The results of the MREM algorithm and the modified MGEM algorithm incorporating the wavelet decomposition-based transition criterion and wavelet interpolation method on simulated phantom data and actual PET camera data are presented.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	594
Ending Page	602
Page Count	9
File Size	1102719
File Format	PDF
ISSN	00189499
Volume Number	46
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reconstruction algorithms Detectors Image reconstruction Energy resolution Positron emission tomography Interpolation Image resolution Switches Convergence Spline
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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