Abstract
Reconstructions of the spatial distributions of radio activity produced using maximum-likelihood estimation in positron emission tomography exhibit noise-like artifacts in the form of sharp peaks and valleys located randomly throughout the image field. These become increasingly apparent with each stage of iteration when the expectation-maximization algorithm is used to produce the maximum-likelihood estimate numerically. A preliminary evaluation of the use of Grenander's method of sieves to reduce these undesirable artifacts is presented.
Original language | English |
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Journal | IEEE Transactions on Nuclear Science |
Volume | NS-33 |
Issue number | 1 |
State | Published - Feb 1 1985 |