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Proceedings Paper

Evaluation of various wavelet bases for use in wavelet-based multiresolution expectation maximization image reconstruction algorithm for PET
Author(s): Amar Raheja; Atam P. Dhawan
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Paper Abstract

Maximum Likelihood (ML) estimation based Expectation Maximization (EM) reconstruction algorithm has shown to provide good quality reconstruction for PET. Our previous work introduced the multigrid EM (MGEM) and multiresolution (MREM) and Wavelet based Multiresolution EM (WMREM) algorithm for PET image reconstruction. This paper investigates the use of various wavelets in the new Wavelet based Multiresolution EM (WMREM) algorithm. The wavelets are used to construct a multiresolution data space, which is then used in the estimation process. The beauty of the wavelet transform to provide localized frequency-space representation of the data allows us to perform the estimation using these decomposed components. The advantage of this method lies with the fact that the noise in the acquired data becomes localized in the high-high or diagonal frequency bands and not using these bands for estimation at coarser resolution helps speed up the recovery of various frequency components with reduced noise estimation. Different wavelet bases result in different reconstructions. Custom wavelets are designed for the reconstruction process and these wavelets provide better results than the commonly known wavelets. The WMREM reconstruction algorithm is implemented to reconstruct simulated phantom data and real data.

Paper Details

Date Published: 6 June 2000
PDF: 10 pages
Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000);
Show Author Affiliations
Amar Raheja, Philadelphia Univ. (United States)
Atam P. Dhawan, Univ. of Toledo (United States)

Published in SPIE Proceedings Vol. 3979:
Medical Imaging 2000: Image Processing
Kenneth M. Hanson, Editor(s)

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