Back to Search
Start Over
A Novel Iterative MLEM Image Reconstruction Algorithm Based on Beltrami Filter: Application to ECT Images
- Source :
- Tomography, Vol 7, Iss 26, Pp 286-300 (2021), Tomography, Volume 7, Issue 3, Pages 26-300
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The implementation of emission-computed tomography (ECT), including positron emission tomography and single-photon emission-computed tomography, has been an important research topic in recent years and is of significant and practical importance. However, the slow rate of convergence and the computational complexity have severely impeded the efficient implementation of iterative reconstruction. By combining the maximum-likelihood expectation maximization (MLEM) iteratively along with the Beltrami filter, this paper proposes a new approach to reformulate the MLEM algorithm. Beltrami filtering is applied to an image obtained using the MLEM algorithm for each iteration. The role of Beltrami filtering is to remove mainly out-of-focus slice blurs, which are artifacts present in most existing images. To improve the quality of an image reconstructed using MLEM, the Beltrami filter employs similar structures, which in turn reduce the number of errors in the reconstructed image. Numerical image reconstruction tomography experiments have demonstrated the performance capability of the proposed algorithm in terms of an increase in signal-to-noise ratio (SNR) and the recovery of fine details that can be hidden in the data. The SNR and visual inspections of the reconstructed images are significantly improved compared to those of a standard MLEM. We conclude that the proposed algorithm provides an edge-preserving image reconstruction and substantially suppress noise and edge artifacts.
- Subjects :
- Computational complexity theory
Computer science
Physics::Medical Physics
Computer applications to medicine. Medical informatics
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION
R858-859.7
Iterative reconstruction
poisson distribution
Article
030218 nuclear medicine & medical imaging
FBP algorithm
03 medical and health sciences
0302 clinical medicine
Convergence (routing)
Expectation–maximization algorithm
medicine
Image Processing, Computer-Assisted
Radiology, Nuclear Medicine and imaging
Computer vision
EM algorithm
Tomography, Emission-Computed, Single-Photon
medicine.diagnostic_test
business.industry
Phantoms, Imaging
beltrami filtering
Filter (signal processing)
emission-computed tomography
030220 oncology & carcinogenesis
Tomography
Artificial intelligence
Noise (video)
business
Tomography, X-Ray Computed
Emission computed tomography
Algorithms
Subjects
Details
- Language :
- English
- Volume :
- 7
- Issue :
- 26
- Database :
- OpenAIRE
- Journal :
- Tomography
- Accession number :
- edsair.doi.dedup.....f90e46693125c1ef6604370a7b046aa2