NDLI: Straight-Line-Trajectory-Based X-Ray Tomographic Imaging for Security Inspections: System Design, Image Reconstruction and Preliminary Results

Content Provider	IEEE Xplore Digital Library
Author	Hewei Gao Li Zhang Zhiqiang Chen Yuxiang Xing Hui Xue Jianping Cheng
Copyright Year	1963
Abstract	With the source and detector kept stationary while an inspected object moves between them, straight-line-trajectory-based tomographic imaging (SLTTI) has the capability to provide both digital radiologic images and tomographic images simultaneously, at high speed and with low-cost equipment. It has a promising future for fast security inspection for air cargo examinations. In order to fully investigate the feasibility of this approach, an experimental SLTTI platform has been developed. In this work, the system design is first presented. Then, a hybrid image reconstruction algorithm is proposed to obtain high quality tomographic images from the system to solve the limited-angle problem it represents. In the proposed algorithm, an initial reconstruction using either a direct filtered-backprojection (FBP) -type algorithm or the linogram technique is followed by a Gerchberg-Papoulis (GP) extrapolation to compensate for missing data. The GP extrapolation is implemented by the linogram technique, and constrained by a total variation (TV) minimization. By taking advantage of the FBP, the linogram and the TV techniques, we establish a fast and stable iterative reconstruction for the SLTTI. Finally, numerical simulations and realistic experiments are given, through which our proposals are validated to be feasible and effective. In the numerical examples, our algorithm can reduce the reconstruction inaccuracies for both high contrast and low contrast objects by factors of more than 15 and can generate nearly artifact free images as if complete projection data were available. A realistic experiment on a CatPhan©600 phantom suggests that high quality tomographic images can be achieved from 120-deg of source fan-beam angle with undersampled data. For a group of explosive simulacra using 90 projection views over 120-deg of source fan-beam angle, the reconstruction inaccuracy can be reduced to lower than 4%.
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	3955
Ending Page	3968
Page Count	14
File Size	2144204
File Format	PDF
ISSN	00189499
Volume Number	60
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Image reconstruction Inspection Security X-ray imaging Computed tomography X-ray tomographic imaging Limited-angle reconstruction linogram straight-line trajectory total variation
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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