2023
Attenuation correction for PET imaging using conditional denoising diffusion probabilistic model
Dong Y, Jang S, Han P, Johnson K, Ma C, Fakhri G, Li Q, Gong K. Attenuation correction for PET imaging using conditional denoising diffusion probabilistic model. 2023, 00: 1-1. DOI: 10.1109/nssmicrtsd49126.2023.10338188.Peer-Reviewed Original ResearchDiffusion probabilistic modelGenerative adversarial networkConditional encodingAttenuation correctionDenoising diffusion probabilistic modelLow-level featuresProbabilistic modelAttenuation coefficientAdversarial networkExtract featuresPET/MR systemsEncodingPET acquisitionNovel methodDiffusion encodingMagnetic resonanceImagesPET imagingCorrectionMR imagingUNetAttenuationNetworkFeaturesResonance
2020
In vivo quantitative mapping of human mitochondrial cardiac membrane potential: a feasibility study
Pelletier-Galarneau M, Petibon Y, Ma C, Han P, Kim S, Detmer F, Yokell D, Guehl N, Normandin M, El Fakhri G, Alpert N. In vivo quantitative mapping of human mitochondrial cardiac membrane potential: a feasibility study. European Journal Of Nuclear Medicine And Molecular Imaging 2020, 48: 414-420. PMID: 32719915, PMCID: PMC7839097, DOI: 10.1007/s00259-020-04878-9.Peer-Reviewed Original ResearchConceptsMembrane potentialBolus injectionHealthy subjectsHematocrit levelsSerial venous blood samplesT1 mapping imagesVenous blood samplesExtracellular space fractionMethodsThirteen healthy subjectsDynamic PET acquisitionCellular membrane potentialGadolinium injectionPrognostic informationVentricular arrhythmiasHeart failureMyocardial hypertrophyMitochondrial membrane potentialCardiac diseaseIn vitro assessmentTherapy monitoringBlood concentrationsPET acquisitionImaging protocolBlood samplesPlasma tracer concentration
2017
Single-scan rest/stress imaging: validation in a porcine model with 18F-Flurpiridaz
Guehl N, Normandin M, Wooten D, Rozen G, Sitek A, Ruskin J, Shoup T, Ptaszek L, El Fakhri G, Alpert N. Single-scan rest/stress imaging: validation in a porcine model with 18F-Flurpiridaz. European Journal Of Nuclear Medicine And Molecular Imaging 2017, 44: 1538-1546. PMID: 28365789, DOI: 10.1007/s00259-017-3684-6.Peer-Reviewed Original ResearchConceptsMyocardial blood flowMicrosphere flow measurementsBlood flowStress myocardial blood flowSingle-scan protocolClinical applicationShort-axis viewMyocardial blood flow measurementsPET dataBlood flow changesIntroduction of adenosineHalf-life of 18FAdenosine infusionRadiotracer injectionAxis viewMyocardial segmentsHealthy pigsClinical translationPET acquisitionTwo-injectionPig modelIschemic areaPorcine modelHalf-lifeAdenosineMonte Carlo simulation of PET/MR scanner and assessment of motion correction strategies
şın A, Ozsahin D, Dutta J, Haddani S, El-Fakhri G. Monte Carlo simulation of PET/MR scanner and assessment of motion correction strategies. Journal Of Instrumentation 2017, 12: c03089-c03089. DOI: 10.1088/1748-0221/12/03/c03089.Peer-Reviewed Original ResearchMotion correction strategiesGATE simulationsMonte Carlo simulationsImage qualityPET/MR scannersPositron emission tomographyPET acquisitionImage reconstruction methodMotion compensation methodEmission tomographyImaging modalitiesAcquisition timeExtraction algorithmReference imageRespiratory movementsTumor detectionGateReconstruction methodPatient movement
2011
Monitoring proton radiation therapy with in-room PET imaging
Zhu X, España S, Daartz J, Liebsch N, Ouyang J, Paganetti H, Bortfeld T, Fakhri G. Monitoring proton radiation therapy with in-room PET imaging. Physics In Medicine And Biology 2011, 56: 4041-4057. PMID: 21677366, PMCID: PMC3141290, DOI: 10.1088/0031-9155/56/13/019.Peer-Reviewed Original ResearchConceptsIn-room positron emission tomographyIn-roomProton therapy treatment roomPositron emission tomography systemProton range verificationSoft tissue-equivalent materialMonte Carlo predictionsTissue-equivalent materialsPositron emission tomography acquisition timesProton radiation therapyPositron emission tomographyBiological washoutRange verificationProton therapyList-modeActivity distribution patternsPhantom studyTreatment roomPET acquisitionSoft tissue regionsIn vivo verificationDeep-siteOff-line modalityPositron emission tomography dataAdenoid cystic carcinoma
2005
Realistic Monte Carlo PET Simulation with Pixellated Block Detectors, Light Sharing and Randoms Modeling
Guérin B, Fakhri G. Realistic Monte Carlo PET Simulation with Pixellated Block Detectors, Light Sharing and Randoms Modeling. 2005, 3: 1563-1567. DOI: 10.1109/nssmic.2005.1596617.Peer-Reviewed Original ResearchPET scannerBlock detectorsPhoton transportRandom coincidencesSimSET softwareMonte Carlo transport codeNEMA NU 2Model of photon transportEnergy weighted averageModel photon transportLight-sharingEnergy spectrumNU 2Light sharingTransport codeCrystal elementsMonte Carlo simulationsPET simulationsVery good agreementInteraction pointPET acquisitionDetection crystalAttenuation distributionDetectorCarlo simulations