2023 IEEE Nuclear Science Symposium

Approximate Variance Images for Penalized-Likelihood Image Reconstruction - Nuclear Science Symposium, 1997. IEEE

for image reconstruction are image variance can be spacemay be useful to augment displays images with displays of variance an indication of uncertainty to the e diagnosis. Variance and covariance also be useful for purposes such Hiiesman's weighting method [2, 31 peialized-likelihood (PL) estimators, statistically significant regions in studies [4, 51, or for evaluating image algorithm performa...

Experimental Evaluation For Joint Estimation Approach - Nuclear Science Symposium, 1996. Conference Record., 1996 IEEE

Single Photon Emission Computed Tomography (SPECT) provides a potential to perform in vivo quantification of the radioactivity and dose distributions in the process of evaluating radiopharmaceuticals. The inherent modest resolution in SPECT impedes the potential of accurate quantification. Previously, we investigated a joint estimation approach for combining SPECT functional information with hi...

Correction for Recombination Loss of Ions in Ionization Chambers - Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE

The signal charge loss due to initial recombination and that due to volume recombination have been measured separately using parallel plate ionization chambers irradiated with cobalt60 gamma rays, over a wide range of applied voltage and air humidity. It is shown that both initial and volume recombination depend on the electric field strength and also on humidity through ion clustering reaction...

Fully Three Dimensional Image Reconstruction from "V''-Projections Acquired by Compton Camera with T - Nuclear Science Symposium, 1997. IEEE

Attenuation correction for whole-body PET imaging using automated fuzzy clustering-based segmentatio - Nuclear Science Symposium Conference Record, 2001 IEEE

Segmented-based attenuation correction is now a widely accepted technique to reduce noise contribution of measured attenuation correction. In this paper, we present a new method for segmenting transmission images in positron emission tomography. This reduces the noise on the correction maps while still correcting for differing attenuation coefficients of specific tissues. Based on the Fuzzy C-M...