Towards novel regularization approaches to PET image reconstruction
Affiliation(s)
Department of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
Department of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece.
ABSTRACT
The purpose of this study is to introduce a novel empirical iterative algorithm for medical image reconstruction, under the short name MRP-ISWLS (Median Root Prior Image Space Weighted Least Squares). Further, we assess the performance of the new algorithm by comparing it to the simultaneous version of known MRP algorithms. All algorithms are compared in terms of cross-correlation and CNRs (Contrast-to-Noise Ratios). As it turns out, MRP-ISWLS presents higher CNRs than the known algorithms for objects of different size. Also MRP-ISWLS has better noise manipulation.
Cite this paper
Karali, E. and Koutsouris, D. (2013) Towards novel regularization approaches to PET image reconstruction. Journal of Biosciences and Medicines, 1, 6-9. doi: 10.4236/jbm.2013.12002.
Karali, E. and Koutsouris, D. (2013) Towards novel regularization approaches to PET image reconstruction. Journal of Biosciences and Medicines, 1, 6-9. doi: 10.4236/jbm.2013.12002.
References
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[1] Phelps M.E. (2004) PET Molecular Imaging and its Applications. Chapter 1, Springer-Verlag, New York. [2] Daube-Witherspoon, M.E. and Muehllehner, G. (1986) An iterative image space reconstruction algorithm suitable for volume ECT. IEEE Transactions on Medical Imaging, 5, 61-66. [3] Anderson, M.M., Mair, B.A., Rao, M. and Wu, C.H. (1997) Weighted least-squares reconstruction methods for positron emission tomography. IEEE Transactions on Medical Imaging, 16, 159-165. http://dx.doi.org/10.1109/42.563661 [4] Alenius, S. Ruotsalainen, U. and Astola J. (1997) Using local median as the location of the prior distribution in iterative emission tomography image reconstruction. Proceedings of IEEE Medical Image Conference, 45, 3097- 3104. [5] Karali, E., Pavlopoulos, S., Lambropoulou, S. and Koutsouris, D. (2011). ISWLS: A novel algorithm for image reconstruction in PET. IEEE Transactions on Information Technology in Biomedicine, 15, 381-386. http://dx.doi.org/10.1109/TITB.2010.2104161 [6] Green, P.J. (1990) On use of the EM algorithm for penalized likelihood estimation. Journal of Royal Statistical Society Series B, 52, 443-452. [7] Cherry, S.R., Sorenson, J.A. and Phelps M.E. (2003) Physics in Nuclear Medicine. Chapter 15, SAUNDERS- Elsevier, Philadelphia.