2023
Association of Sleep Duration and Change Over Time With Imaging Biomarkers of Cerebrovascular, Amyloid, Tau, and Neurodegenerative Pathology
Baril A, Kojis D, Himali J, Decarli C, Sanchez E, Johnson K, El Fakhri G, Thibault E, Yiallourou S, Himali D, Cavuoto M, Pase M, Beiser A, Seshadri S. Association of Sleep Duration and Change Over Time With Imaging Biomarkers of Cerebrovascular, Amyloid, Tau, and Neurodegenerative Pathology. Neurology 2023, 102: e207807. PMID: 38165370, PMCID: PMC10834132, DOI: 10.1212/wnl.0000000000207807.Peer-Reviewed Original ResearchMeSH KeywordsAgedAmyloidogenic ProteinsBiomarkersCross-Sectional StudiesFemaleHumansMaleMiddle AgedNeuroimagingSleep DurationConceptsHigher WMH burdenSelf-reported sleep durationLong sleep durationNeuroimaging metricsSleep durationAssociated with incident dementiaNeurodegenerative trajectoriesSleep duration categoriesNeuroimaging markersTAU outcomesIncident dementiaNeuroimagingSleep duration changesNeuroimaging testsLinear regression modelsDuration changesMRI metricsAlzheimer's disease
2020
PET imaging of neurotransmission using direct parametric reconstruction
Petibon Y, Alpert N, Ouyang J, Pizzagalli D, Cusin C, Fava M, Fakhri G, Normandin M. PET imaging of neurotransmission using direct parametric reconstruction. NeuroImage 2020, 221: 117154. PMID: 32679252, PMCID: PMC7800040, DOI: 10.1016/j.neuroimage.2020.117154.Peer-Reviewed Original ResearchMeSH KeywordsBrainComputer SimulationHumansNeuroimagingPositron-Emission TomographyRadiopharmaceuticalsSynaptic TransmissionConceptsSignal-to-noise ratioImage reconstructionPositron emission tomography image reconstructionLow signal-to-noise ratioPoisson log-likelihood functionScattered coincidencesDetector sensitivityPET sinogramsStatistical fluctuationsEstimate parametric imagesGradient-based optimizationParametric reconstructionLog-likelihood functionEffects of head movementVoxel scalePositron emission tomographySimplified reference region modelActivity concentration data
2016
Discovery of a Highly Selective Glycogen Synthase Kinase‐3 Inhibitor (PF‐04802367) That Modulates Tau Phosphorylation in the Brain: Translation for PET Neuroimaging
Liang S, Chen J, Normandin M, Chang J, Chang G, Taylor C, Trapa P, Plummer M, Para K, Conn E, Lopresti‐Morrow L, Lanyon L, Cook J, Richter K, Nolan C, Schachter J, Janat F, Che Y, Shanmugasundaram V, Lefker B, Enerson B, Livni E, Wang L, Guehl N, Patnaik D, Wagner F, Perlis R, Holson E, Haggarty S, Fakhri G, Kurumbail R, Vasdev N. Discovery of a Highly Selective Glycogen Synthase Kinase‐3 Inhibitor (PF‐04802367) That Modulates Tau Phosphorylation in the Brain: Translation for PET Neuroimaging. Angewandte Chemie International Edition 2016, 55: 9601-9605. PMID: 27355874, PMCID: PMC4983481, DOI: 10.1002/anie.201603797.Peer-Reviewed Original ResearchConceptsGlycogen synthase kinase-3Tau phosphorylationPET neuroimagingPET imaging studiesModulation of tau phosphorylationNon-human primatesRegulate multiple cellular processesModulates tau phosphorylationMultiple cellular processesBrainBrain permeabilityImaging studiesCellular processesDisplaceable bindingKinase-3
2015
National Electrical Manufacturers Association and Clinical Evaluation of a Novel Brain PET/CT Scanner
Grogg K, Toole T, Ouyang J, Zhu X, Normandin M, Li Q, Johnson K, Alpert N, Fakhri G. National Electrical Manufacturers Association and Clinical Evaluation of a Novel Brain PET/CT Scanner. Journal Of Nuclear Medicine 2015, 57: 646-652. PMID: 26697961, PMCID: PMC4818715, DOI: 10.2967/jnumed.115.159723.Peer-Reviewed Original ResearchConceptsNoise-equivalent count rateCount rateLoose cutsMaximum noise-equivalent counting rateSpatial resolutionDetector ringSilicon photomultipliersBrain phantomContrast recoveryAttenuation correctionPET/CT systemCrystal blockPET/CT scannerImage qualityRadial offsetNational Electrical Manufacturers AssociationActivity distributionUnique mobility capabilitiesAxial extentTransverse resolutionPhantomAxial resolutionActivity concentrationsHuman scansLayer 1 cm
2013
Dual-Tracer PET Using Generalized Factor Analysis of Dynamic Sequences
El Fakhri G, Trott C, Sitek A, Bonab A, Alpert N. Dual-Tracer PET Using Generalized Factor Analysis of Dynamic Sequences. Molecular Imaging And Biology 2013, 15: 666-674. PMID: 23636489, PMCID: PMC3812387, DOI: 10.1007/s11307-013-0631-1.Peer-Reviewed Original ResearchConceptsEmit gamma raysPositron emission tomographyNear-simultaneous imagingSingle-photon emissionBrain PET studiesGamma raysSingle-photon emission computed tomographyActivity distributionRaclopride studiesEmission computed tomographyPositron emission tomography radiopharmaceuticalsSimultaneous imagingD2 bindingFactor analysis of dynamic sequencesActivity estimationTime activity curvesRacloprideFDGRhesus monkeysEmission tomographyPET studiesActivation curveBrain metabolismEmissionSimulate human data
2012
Parametric imaging with Bayesian priors: A validation study with 11C-Altropane PET
Fang Y, Fakhri G, Becker J, Alpert N. Parametric imaging with Bayesian priors: A validation study with 11C-Altropane PET. NeuroImage 2012, 61: 131-138. PMID: 22425668, DOI: 10.1016/j.neuroimage.2012.03.003.Peer-Reviewed Original ResearchMeSH KeywordsAdolescentAdultAlgorithmsBayes TheoremBiasCarbon RadioisotopesCocaineData Interpretation, StatisticalFemaleHumansImage Processing, Computer-AssistedKineticsLeast-Squares AnalysisMaleMiddle AgedNeuroimagingNonlinear DynamicsNormal DistributionPopulationPositron-Emission TomographyRadiopharmaceuticalsReference ValuesSample SizeYoung Adult