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6 June 2000 Evaluation of various wavelet bases for use in wavelet-based multiresolution expectation maximization image reconstruction algorithm for PET
Amar Raheja, Atam P. Dhawan
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Proceedings Volume 3979, Medical Imaging 2000: Image Processing; (2000) https://doi.org/10.1117/12.387651
Event: Medical Imaging 2000, 2000, San Diego, CA, United States
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.
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Amar Raheja and Atam P. Dhawan "Evaluation of various wavelet bases for use in wavelet-based multiresolution expectation maximization image reconstruction algorithm for PET", Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); https://doi.org/10.1117/12.387651
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KEYWORDS
Wavelets
Expectation maximization algorithms
Reconstruction algorithms
Image restoration
Positron emission tomography
Linear filtering
Wavelet transforms
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