Nonstationary filtering of transmission tomograms in high photon counting noise
- 1 January 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Medical Imaging
- Vol. 10 (3), 445-452
- https://doi.org/10.1109/42.97595
Abstract
The algorithm presented here for nonstationary constrained least-squares filtering deals with the transmission photon counting noise problem in the presence of limited dosages and highly nonhomogeneous fields. This technique consists of a design for a set of nonstationary filters, tuned to local noise autocorrelation functions in the reconstructed image. Estimates of noise properties can be taken from object detection information. The approach yields improvement in the tradeoff between noise levels and resolution of the image by exchanging artifacts for less colored noise, which is more easily overcome by the viewer.Keywords
This publication has 14 references indexed in Scilit:
- Bayesian estimation from projections with low photon dosagesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1991
- Restoration of combined conjugate images in SPECT: comparison of a new Wiener filter and the image-dependent Metz filterIEEE Transactions on Nuclear Science, 1990
- Effect of noise correlation on detectability of disk signals in medical imagingJournal of the Optical Society of America A, 1985
- Reconstruction from projections based on detection and estimation of objects--Parts I and II: Performance analysis and robustness analysisIEEE Transactions on Acoustics, Speech, and Signal Processing, 1984
- Noise Limitations in X-Ray Computed TomographyJournal of Computer Assisted Tomography, 1978
- The effects of a finite number of projection angles and finite lateral sampling of projections on the propagation of statistical errors in transverse section reconstructionPhysics in Medicine & Biology, 1977
- Image Restoration Based on a Subjective CriterionIEEE Transactions on Systems, Man, and Cybernetics, 1976
- Statistical limitations in transaxial tomographyComputers in Biology and Medicine, 1976
- The Fourier reconstruction of a head sectionIEEE Transactions on Nuclear Science, 1974
- The Simplex Method for Quadratic ProgrammingEconometrica, 1959