NDLI: Nonlocal-means approaches to anatomy-based PET image reconstruction

Content Provider	IEEE Xplore Digital Library
Author	Van-Giang Nguyen Soo-Jin Lee
Copyright Year	2010
Description	Author affiliation: Department of Electronic Engineering, Paichai University, Daejeon, Korea (Van-Giang Nguyen; Soo-Jin Lee)
Abstract	We propose nonlocal-means (NLM) approaches to incorporating prior anatomical information into PET image reconstruction. In our NLM approaches, adaptive smoothing is performed on the PET image by using the weights that reflect the self-similarity property of the underlying PET image with the aid of the additional information obtained from the anatomical image. Unlike conventional anatomy-based reconstruction methods, our methods using the anatomy-based NLM priors do not require additional processes to extract anatomical boundaries or segmented regions. In this work we apply the NLM algorithm to both the maximum a posteriori (MAP) and the minimum cross entropy (MXE) reconstruction methods. Our experimental results demonstrate that, compared to the conventional methods based on local smoothing, our methods based on the nonlocal means algorithm remarkably improve the reconstruction accuracy in terms of both percentage error and regional bias even with imperfect anatomical information or in the presence of signal mismatch between the PET image and the anatomical image.
Starting Page	3273
Ending Page	3277
File Size	1220062
Page Count	5
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874410
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Image reconstruction Pixel Reconstruction algorithms Smoothing methods Noise Phantoms
Content Type	Text
Resource Type	Article

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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
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