2020
Dynamic Cardiac SPECT for diagnostic and theranostics applications: latest results
Bläckberg L, Sajedi S, Anderson O, Feng Y, Fakhri G, Furenlid L, Sabet H. Dynamic Cardiac SPECT for diagnostic and theranostics applications: latest results. 2020, 00: 1-3. DOI: 10.1109/nss/mic42677.2020.9508002.Peer-Reviewed Original ResearchCsI:Tl crystalsMPPC arraysTl crystalsCsI:Tl scintillatorGamma-ray energiesCardiac SPECTCsI:TlLow energy resolutionCardiac SPECT imagingGamma cameraConventional gamma cameraResolution recovery techniquesSensL SiPMsEnergy resolutionStopping powerTl scintillatorDetector modulesReadout electronicsDynamic cardiac SPECTPinhole collimatorHigh power lasersPhantom studyCollimatorDetectorSiPM
2006
Fast Monte Carlo Simulation Based Joint Iterative Reconstruction for Simultaneous 99mTc/123I Brain SPECT Imaging
Ouyang J, Fakhri G, Moore S, Kijewski M. Fast Monte Carlo Simulation Based Joint Iterative Reconstruction for Simultaneous 99mTc/123I Brain SPECT Imaging. 2006, 4: 2251-2256. DOI: 10.1109/nssmic.2006.354362.Peer-Reviewed Original ResearchMC-JOSEMAW-OSEMMonte CarloFast Monte CarloIterative reconstructionOrdered-subset expectation maximizationStandard ordered subsetsIterative reconstruction algorithmScattered photonsPhoton transportSeptal penetrationAttenuation distributionPhysical effectsIdentical physiological conditionsPatient-specific activityReconstructed imagesReconstruction algorithmActivity estimationComptonRoot mean square errorPhotonsCorrection methodCollimatorBrain perfusionDetector
2005
Performance of a novel collimator for high‐sensitivity brain SPECT
Fakhri G, Ouyang J, Zimmerman R, Fischman A, Kijewski M. Performance of a novel collimator for high‐sensitivity brain SPECT. Medical Physics 2005, 33: 209-215. PMID: 16485427, DOI: 10.1118/1.2143140.Peer-Reviewed Original ResearchConceptsSphere activity concentrationNPW-SNRStandard collimatorSphere-to-background activity ratiosAttenuation of countsPhantom centerActivity concentrationsPoint spread functionCentral regionCollimatorPhantom studyStriatal phantomCylindrical backgroundResolution recoveryPhantomSpherical lesionsRamp filterCrystal surfaceSpread functionSignal-to-noise ratioCentral brain structuresFitting imageHealthy volunteersBrain SPECTSphere activity
2003
Quantitative Ga-67 SPECT Imaging
Moore S, Fakhri G, Park I, Kijewski M. Quantitative Ga-67 SPECT Imaging. 2003, 4: 2898-2900. DOI: 10.1109/nssmic.2003.1352489.Peer-Reviewed Original ResearchPb X-raysContaminating photonsPatient scatterUnscattered photonsAnthropomorphic phantomPhotopeak windowNonuniform attenuationCollimator resolutionAttenuation mapGa-67Iterative reconstructionProjection imagesTumor activityPhotonsNoise realizationsGa-67 imagingTumor estimationQuantitative imagingHistopathological stagingLocal backgroundTumor avidityAverage precisionX-rayCollimatorIterative algorithm
2002
Optimal Parallel-Hole Collimation for Lesion Detection and Activity Estimation in Ga-67 Imaging
Moore S, Kijewski M, Fakhri G. Optimal Parallel-Hole Collimation for Lesion Detection and Activity Estimation in Ga-67 Imaging. 2002, 3: 1390-1392. DOI: 10.1109/nssmic.2002.1239580.Peer-Reviewed Original ResearchCollimator designMedium-energy (MESimulation of photon transportSignal-to-noise ratioParallel-hole collimatorDesign of collimatorsClinical imaging tasksGa-67Contaminating photonsField of nuclear medicineEnergy windowFixed energyPhoton transportOptimal collimatorCollimatorCommercial collimatorsStaging of lymphoma patientsHotelling observerGa-67 imagingNuclear medicine clinicsLesion detectionNuclear medicineDetectorActivity concentrationsResolution values
2000
A new scatter compensation method for Ga-67 imaging using artificial neural networks
Fakhri G, Moore S, Maksud P. A new scatter compensation method for Ga-67 imaging using artificial neural networks. 2011 IEEE Nuclear Science Symposium Conference Record 2000, 2: 13/48-13/52 vol.2. DOI: 10.1109/nssmic.2000.949989.Peer-Reviewed Original ResearchK-shell X-raysEnergy window imagesAnthropomorphic torso phantomScatter correction methodPoisson noise realizationsGa-67 studiesPhotoelectric absorptionPhoton interactionsWindow imagesTorso phantomArtificial neural networkCoherent scatteringMonte Carlo simulationsScatter correctionGa-67Reconstructed volumeNeural networkCarlo simulationsCollimatorNoise realizationsScatteringGa-67 imagingArtificial neural network learningPrimary distributionError backpropagation