Matches in SemOpenAlex for { <https://semopenalex.org/work/W1993474563> ?p ?o ?g. }
Showing items 1 to 96 of
96
with 100 items per page.
- W1993474563 endingPage "105" @default.
- W1993474563 startingPage "98" @default.
- W1993474563 abstract "An efficient iterative reconstruction method for positron emission tomography (PET) is presented. The algorithm is basically an enhanced EM (expectation maximization) algorithm with improved frequency response. High-frequency components of the ratio of measured to calculated projections are extracted and are taken into account for the iterative correction of image density in such a way that the correction is performed with a uniform efficiency over the image plane and with a flat frequency response. As a result, the convergence speed is not so sensitive to the image pattern or matrix size as the standard EM algorithm, and nonuniformity of the spatial resolution is significantly improved. Nonnegativity of the reconstructed image is preserved. Simulation studies have been made assuming two PET systems: a scanning PET with ideal sampling and a stationary PET with sparse sampling. In the latter, a bank array of detectors is employed to improve the sampling in the object plane. The new algorithm provides satisfactory images by two or three iterations starting from a flat image in either case. The behavior of convergence is monitored by evaluating the root mean square of C(b)-1 where C(b) is the correction factor for pixel b in the EM algorithm. The value decreases rapidly and monotonically with iteration number. Although the theory is not accurate enough to assure the stability of convergence, the algorithm is promising to achieve significant saving in computation compared to the standard EM algorithm." @default.
- W1993474563 created "2016-06-24" @default.
- W1993474563 creator A5017958083 @default.
- W1993474563 date "1987-06-01" @default.
- W1993474563 modified "2023-09-23" @default.
- W1993474563 title "A Fast Reconstruction Algorthm for Stationary Positron Emission Tomography Based on a Modified EM Algorithm" @default.
- W1993474563 cites W1964193034 @default.
- W1993474563 cites W1968257972 @default.
- W1993474563 cites W1978987516 @default.
- W1993474563 cites W2002699001 @default.
- W1993474563 cites W2041115669 @default.
- W1993474563 cites W2042094148 @default.
- W1993474563 cites W2042908606 @default.
- W1993474563 cites W2069629287 @default.
- W1993474563 cites W2093266936 @default.
- W1993474563 cites W2093283732 @default.
- W1993474563 cites W2131654961 @default.
- W1993474563 cites W2162809325 @default.
- W1993474563 cites W4234848677 @default.
- W1993474563 doi "https://doi.org/10.1109/tmi.1987.4307809" @default.
- W1993474563 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18230435" @default.
- W1993474563 hasPublicationYear "1987" @default.
- W1993474563 type Work @default.
- W1993474563 sameAs 1993474563 @default.
- W1993474563 citedByCount "80" @default.
- W1993474563 countsByYear W19934745632015 @default.
- W1993474563 countsByYear W19934745632016 @default.
- W1993474563 countsByYear W19934745632017 @default.
- W1993474563 countsByYear W19934745632018 @default.
- W1993474563 countsByYear W19934745632021 @default.
- W1993474563 crossrefType "journal-article" @default.
- W1993474563 hasAuthorship W1993474563A5017958083 @default.
- W1993474563 hasConcept C105795698 @default.
- W1993474563 hasConcept C11413529 @default.
- W1993474563 hasConcept C120665830 @default.
- W1993474563 hasConcept C121332964 @default.
- W1993474563 hasConcept C140779682 @default.
- W1993474563 hasConcept C141379421 @default.
- W1993474563 hasConcept C159694833 @default.
- W1993474563 hasConcept C160633673 @default.
- W1993474563 hasConcept C162324750 @default.
- W1993474563 hasConcept C163716698 @default.
- W1993474563 hasConcept C182081679 @default.
- W1993474563 hasConcept C205372480 @default.
- W1993474563 hasConcept C2777303404 @default.
- W1993474563 hasConcept C2779898584 @default.
- W1993474563 hasConcept C31972630 @default.
- W1993474563 hasConcept C33923547 @default.
- W1993474563 hasConcept C41008148 @default.
- W1993474563 hasConcept C45374587 @default.
- W1993474563 hasConcept C49781872 @default.
- W1993474563 hasConcept C50522688 @default.
- W1993474563 hasConcept C94915269 @default.
- W1993474563 hasConceptScore W1993474563C105795698 @default.
- W1993474563 hasConceptScore W1993474563C11413529 @default.
- W1993474563 hasConceptScore W1993474563C120665830 @default.
- W1993474563 hasConceptScore W1993474563C121332964 @default.
- W1993474563 hasConceptScore W1993474563C140779682 @default.
- W1993474563 hasConceptScore W1993474563C141379421 @default.
- W1993474563 hasConceptScore W1993474563C159694833 @default.
- W1993474563 hasConceptScore W1993474563C160633673 @default.
- W1993474563 hasConceptScore W1993474563C162324750 @default.
- W1993474563 hasConceptScore W1993474563C163716698 @default.
- W1993474563 hasConceptScore W1993474563C182081679 @default.
- W1993474563 hasConceptScore W1993474563C205372480 @default.
- W1993474563 hasConceptScore W1993474563C2777303404 @default.
- W1993474563 hasConceptScore W1993474563C2779898584 @default.
- W1993474563 hasConceptScore W1993474563C31972630 @default.
- W1993474563 hasConceptScore W1993474563C33923547 @default.
- W1993474563 hasConceptScore W1993474563C41008148 @default.
- W1993474563 hasConceptScore W1993474563C45374587 @default.
- W1993474563 hasConceptScore W1993474563C49781872 @default.
- W1993474563 hasConceptScore W1993474563C50522688 @default.
- W1993474563 hasConceptScore W1993474563C94915269 @default.
- W1993474563 hasIssue "2" @default.
- W1993474563 hasLocation W19934745631 @default.
- W1993474563 hasLocation W19934745632 @default.
- W1993474563 hasOpenAccess W1993474563 @default.
- W1993474563 hasPrimaryLocation W19934745631 @default.
- W1993474563 hasRelatedWork W2040119889 @default.
- W1993474563 hasRelatedWork W2072292658 @default.
- W1993474563 hasRelatedWork W2093283732 @default.
- W1993474563 hasRelatedWork W2105282068 @default.
- W1993474563 hasRelatedWork W2150329863 @default.
- W1993474563 hasRelatedWork W2177676267 @default.
- W1993474563 hasRelatedWork W2532315310 @default.
- W1993474563 hasRelatedWork W2548307978 @default.
- W1993474563 hasRelatedWork W2753113106 @default.
- W1993474563 hasRelatedWork W2783598486 @default.
- W1993474563 hasVolume "6" @default.
- W1993474563 isParatext "false" @default.
- W1993474563 isRetracted "false" @default.
- W1993474563 magId "1993474563" @default.
- W1993474563 workType "article" @default.