1995
Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data
Pan T, King M, Penney B, Rajeevan N, Luo D, Case J. Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data. 1995, 4: 1563-1567 vol.4. DOI: 10.1109/nssmic.1994.474764.Peer-Reviewed Original ResearchAttenuation mapTruncation artifactsAttenuation coefficientCompton scattered photonsTransmission projection dataParallel hole collimatorTransmission image reconstructionScattered photonsHole collimatorSPECT systemBeam transmissionPhantom studyReprojection dataProjection angleTransmission dataProjection dataImage reconstructionEmissionReduction of truncation artifactsEmission dataPhotonsCollimatorAttenuationSimultaneous transmissionAugmented data
1992
Quantitative SPECT imaging: compensation for nonuniform attenuation, scatter, and detector divergence
Rajeevan N, Penney B, King M. Quantitative SPECT imaging: compensation for nonuniform attenuation, scatter, and detector divergence. 1992, 995-997 vol.2. DOI: 10.1109/nssmic.1992.301080.Peer-Reviewed Original ResearchPosition-dependent point-spread functionAttenuation mapNonuniform attenuationNonuniform attenuation mapReconstructed SPECT imagesRobust estimation techniquesThree-headed SPECT systemBeam collimationSPECT systemPoint spread functionPhysical phantomChange algorithmEstimation techniquesQuantitative accuracyTransmission dataFocal lineAttenuating mediaScatteringReconstruction algorithmSpread functionScattering responseDetectorSource of activityAlgorithmReconstruction method
1991
An accelerated 3D maximum likelihood SPECT image reconstruction
Rajeevan N, Penney B, Byrne C. An accelerated 3D maximum likelihood SPECT image reconstruction. 1991, 1963-1968 vol.3. DOI: 10.1109/nssmic.1991.259260.Peer-Reviewed Original ResearchVector extrapolation techniquesMLE algorithmImage reconstructionProjector-backprojector pairSPECT image reconstructionIterative algorithmAlgorithmComputation timeScheme resultsMaximum likelihood estimationAcceleration schemeSPECT systemExtrapolation techniquePatient dataBlurComputerTwo-DimensionalScheme
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