2020
Penalized Parametric PET Image Estimation Using Local Linear Fitting
Kim K, Gong K, Moon S, Fakhri G, Normandin M, Li Q. Penalized Parametric PET Image Estimation Using Local Linear Fitting. IEEE Transactions On Radiation And Plasma Medical Sciences 2020, 4: 750-758. DOI: 10.1109/trpms.2020.3024123.Peer-Reviewed Original ResearchReconstructed framesImage estimationGraphical modelsFull-dose imagesStatic imagesParametric imaging methodFunction extractionPhysiological informationImagesPositron emission tomographyLogan graphical modelConventional methodsPatient studiesKinetic parametersSuboptimalityFrameDynamic imagingTwo-tissue compartment model
2017
Magnetic Resonance–based Motion Correction for Quantitative PET in Simultaneous PET-MR Imaging
Rakvongthai Y, Fakhri G. Magnetic Resonance–based Motion Correction for Quantitative PET in Simultaneous PET-MR Imaging. PET Clinics 2017, 12: 321-327. PMID: 28576170, PMCID: PMC6452624, DOI: 10.1016/j.cpet.2017.02.004.Peer-Reviewed Original ResearchConceptsSimultaneous PET-MRQuantitative PET imagingMotion correctionSimultaneous PET-MR imagingReconstructed PET imagesMotion-corrected imagesPET-MRMotion correction strategiesPET imagingPET-MR imagingQuantitation of PET imagesPatient studiesQuantitative PETImage qualityMotionCorrectionPhantomAnatomical informationCorrection strategyMR imagingJoint reconstruction of Ictal/inter‐ictal SPECT data for improved epileptic foci localization
Rakvongthai Y, Fahey F, Borvorntanajanya K, Tepmongkol S, Vutrapongwatana U, Zukotynski K, Fakhri G, Ouyang J. Joint reconstruction of Ictal/inter‐ictal SPECT data for improved epileptic foci localization. Medical Physics 2017, 44: 1437-1444. PMID: 28211105, PMCID: PMC5462456, DOI: 10.1002/mp.12167.Peer-Reviewed Original ResearchConceptsSPECT reconstruction methodDifferential imagingLow-noise datasetConventional subtraction methodLesion contrastSPECT projection dataEpileptic focus localizationHoffman phantomPatient studiesReconstruction methodJoint methodSPECT projectionsHead phantomPhantom locationsSubtraction methodPhantom studyNuclear medicine physiciansAttenuation backgroundPhantomConventional subtraction approachFocus localizationConventional subtractionReceiver operating characteristicLow noiseProjection data
2015
Pulmonary imaging using respiratory motion compensated simultaneous PET/MR
Dutta J, Huang C, Li Q, Fakhri G. Pulmonary imaging using respiratory motion compensated simultaneous PET/MR. Medical Physics 2015, 42: 4227-4240. PMID: 26133621, PMCID: PMC4474958, DOI: 10.1118/1.4921616.Peer-Reviewed Original ResearchConceptsRespiratory motionContrast-to-noise ratioClinical patient studiesPulse sequenceHigh-intensity featuresXCAT studyLow proton densityXCAT simulationPatient studiesXCAT phantomAttenuation mapBiograph mMRComplete data acquisitionSimultaneous PET/MRNonrigid registrationPET/MR scannersPET/magnetic resonanceMagnetic susceptibilityProton densityQuantitative accuracyRelaxation timePulmonary imagingLung lesionsBlurring artifactsDeformation field
2014
Relative role of motion and PSF compensation in whole‐body oncologic PET‐MR imaging
Petibon Y, Huang C, Ouyang J, Reese T, Li Q, Syrkina A, Chen Y, Fakhri G. Relative role of motion and PSF compensation in whole‐body oncologic PET‐MR imaging. Medical Physics 2014, 41: 042503. PMID: 24694156, PMCID: PMC3971824, DOI: 10.1118/1.4868458.Peer-Reviewed Original ResearchConceptsPoint spread function modelRespiratory motionPoint spread functionPET-MR scannersPencil-beam navigator echoesPET-MRMeasurement of respiratory motionPSF modelRespiratory motion correctionDetector blur effectsModel respiratory motionLung-liver interfacePatient studiesLesion contrastSimultaneous PET-MRSource of image degradationWhole-body PET imagingPET reconstruction algorithmMoving lesionsPhantom experiment resultsPET eventsContrast recoveryNavigator echoesIterative reconstruction processMotion correction
2013
Simultaneous 99mTc‐MDP/123I‐MIBG tumor imaging using SPECT‐CT: Phantom and constructed patient studies
Rakvongthai Y, Fakhri G, Lim R, Bonab A, Ouyang J. Simultaneous 99mTc‐MDP/123I‐MIBG tumor imaging using SPECT‐CT: Phantom and constructed patient studies. Medical Physics 2013, 40: 102506. PMID: 24089927, PMCID: PMC3785531, DOI: 10.1118/1.4820977.Peer-Reviewed Original ResearchConceptsScatter correctionDual-radionuclideContrast recoveryPhantom studyAnthropomorphic torso phantomPatient studiesTumor uptakeTumor imagingSPECT projectionsTorso phantomMonte-CarloPhantom dataPhantomIterative reconstructionOSEMProjection dataDR dataIncrease patient throughputNoise realizationsSPECT-CTImage reconstructionClinical studiesTumorTumor projectionPoisson noise
2011
Improvement in Lesion Detection with Whole-Body Oncologic Time-of-Flight PET
Fakhri G, Surti S, Trott C, Scheuermann J, Karp J. Improvement in Lesion Detection with Whole-Body Oncologic Time-of-Flight PET. Journal Of Nuclear Medicine 2011, 52: 347-353. PMID: 21321265, PMCID: PMC3088884, DOI: 10.2967/jnumed.110.080382.Peer-Reviewed Original ResearchConceptsTime-of-flight PETTime-of-flightTOF-PETTime-of-flight reconstructionBody mass indexList-mode dataNon-TOF PETObserver signal-to-noise ratioOrdered-subset expectation maximizationMass indexNon-TOFLesion detectionLesion detection performanceSpherical lesionsFunction of body mass indexSignal-to-noise ratioScan timePatient studiesLesion visibilityArtificial lesionsLiver lesionsPatientsLesionsLesion locationLow lesions
2010
SU‐GG‐J‐149: Feasibility of In‐Room PET Imaging for in Vivo Proton Beam Range Verification
España S, Zhu X, Daartz J, Liebsch N, Fakhri G, Bortfeld T, Paganetti H. SU‐GG‐J‐149: Feasibility of In‐Room PET Imaging for in Vivo Proton Beam Range Verification. Medical Physics 2010, 37: 3180-3180. DOI: 10.1118/1.3468372.Peer-Reviewed Original ResearchRange verificationIn-roomProton therapyIn vivo range verificationProton beam range verificationPassive scattering proton therapyBeam range verificationIn-room measurementsOff-line protocolsFalloff positionsBiological washoutTreatment couchCount ratePET imagingTreatment positionPET scannerAttenuation correctionTreatment roomPET scansCo-registration accuracyCT numbersCalculated uncertaintiesPatient studiesWashout modelTreatment planning
2005
Quantitative dynamic cardiac 82Rb PET using generalized factor and compartment analyses.
El Fakhri G, Sitek A, Guérin B, Kijewski M, Di Carli M, Moore S. Quantitative dynamic cardiac 82Rb PET using generalized factor and compartment analyses. Journal Of Nuclear Medicine 2005, 46: 1264-71. PMID: 16085581.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAged, 80 and overAlgorithmsComputer SimulationCoronary Artery DiseaseFeasibility StudiesFemaleHeartHumansImage Interpretation, Computer-AssistedMaleMiddle AgedModels, CardiovascularPositron-Emission TomographyRadiopharmaceuticalsReproducibility of ResultsRubidium RadioisotopesSensitivity and SpecificitySeverity of Illness IndexConceptsMyocardial perfusionAbsolute myocardial perfusionCatheterization resultsMyocardial tissue extractsDipyridamole stressCardiac PETClinical valueMyocardial factorsFactor analysis of dynamic sequencesPatient studiesLVNoninvasive estimationAccurate input functionPatientsCompartment analysisAverage errorPerfusionParametric mappingTissue extractsRV contributionRV