Sparsity seeking total generalized variation for undersampled tomographic reconstruction
File(s)C2016_Kazantsev_IEEE_Biomed_Conf_TGVT_green.pdf (2.87 MB)
Accepted version
Author(s)
Kazantsev, D
Ovtchinnikov, E
Withers, PJ
Lionheart, WRB
Lee, PD
Type
Conference Paper
Abstract
Here we present a novel iterative approach for tomographic image reconstruction which improves image quality for undersampled and limited view projection measurements. Recently, the Total Generalized Variation (TGV) penalty has been proposed to establish a desirable balance between smooth and piecewise-constant solutions. Piecewise-smooth reconstructions are particularly important for biomedical applications, where the image surface slowly varies. The TGV penalty convexly combines the first and higher order derivatives, which means that for some regions (e.g. uniform background) it can be more challenging to find a sparser solution due to the weight of the higher order term. Therefore we propose a simple heuristic modification over the Chambolle-Pock reconstruction scheme for TGV which consists of adding the wavelet thresholding step which helps to suppress aliasing artifacts and noise while preserve piecewise-smooth appearance. Preliminary numerical results with two piecewise-smooth phantoms show strong improvement of the proposed method over TGV and TV penalties. The resulting images are smooth with sharp edges and fewer artifacts visible.
Date Issued
2016-06-16
Date Acceptance
2016-04-13
Citation
2016 IEEE 13th International Symposium on Biomedical Imaging (ISBI), 2016, pp.731-734
ISBN
978-1-4799-2349-6
ISSN
1945-8452
Publisher
IEEE
Start Page
731
End Page
734
Journal / Book Title
2016 IEEE 13th International Symposium on Biomedical Imaging (ISBI)
Copyright Statement
© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000386377400173&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Source
IEEE 13th International Symposium on Biomedical Imaging (ISBI)
Subjects
Science & Technology
Technology
Life Sciences & Biomedicine
Engineering, Biomedical
Radiology, Nuclear Medicine & Medical Imaging
Engineering
Iterative reconstruction
regularization
missing wedge
limited data
hard thresholding
wavelets
Publication Status
Published
Start Date
2016-04-13
Finish Date
2016-04-16
Coverage Spatial
Prague, CZECH REPUBLIC