2023
B1 inhomogeneity‐corrected T1 mapping and quantitative magnetization transfer imaging via simultaneously estimating Bloch‐Siegert shift and magnetization transfer effects
Jang A, Han P, Ma C, Fakhri G, Wang N, Samsonov A, Liu F. B1 inhomogeneity‐corrected T1 mapping and quantitative magnetization transfer imaging via simultaneously estimating Bloch‐Siegert shift and magnetization transfer effects. Magnetic Resonance In Medicine 2023, 90: 1859-1873. PMID: 37427533, PMCID: PMC10528411, DOI: 10.1002/mrm.29778.Peer-Reviewed Original ResearchConceptsBloch-Siegert shiftBloch-SiegertMagnetization transfer effectsMonte Carlo simulationsSpin-lattice relaxationSpin-bath modelMagnetization transferBinary spin-bath modelCarlo simulationsProton fractionOff-resonance irradiationIn vivo brain studiesBloch simulationsPhantom experimentsMagnetizationEstimationTransmitted fieldQuantitative magnetization transferMethod performanceMT effectSignal equationImpact of motion correction on [18F]-MK6240 tau PET imaging
Tiss A, Marin T, Chemli Y, Spangler-Bickell M, Gong K, Lois C, Petibon Y, Landes V, Grogg K, Normandin M, Becker A, Thibault E, Johnson K, Fakhri G, Ouyang J. Impact of motion correction on [18F]-MK6240 tau PET imaging. Physics In Medicine And Biology 2023, 68: 105015. PMID: 37116511, PMCID: PMC10278956, DOI: 10.1088/1361-6560/acd161.Peer-Reviewed Original ResearchConceptsMotion correctionPET quantitationImpact of motion correctionList-mode reconstructionMotion correction methodList-mode dataMotion-corrected imagesEffect of motion correctionVoxel displacementsPhantom experimentsOptical tracking dataLong acquisitionBrain PET scansSlow motionImage qualityPET imagingPositron emission tomographyCorrectionMotionCorrection methodRates of tau accumulationHead motionMotion metricsPhantomPositron
2017
A minimum-phase Shinnar-Le Roux spectral-spatial excitation RF pulse for simultaneous water and lipid suppression in 1H-MRSI of body extremities
Han P, Ma C, Deng K, Hu S, Jee K, Ying K, Chen Y, Fakhri G. A minimum-phase Shinnar-Le Roux spectral-spatial excitation RF pulse for simultaneous water and lipid suppression in 1H-MRSI of body extremities. Magnetic Resonance Imaging 2017, 45: 18-25. PMID: 28917812, PMCID: PMC5709164, DOI: 10.1016/j.mri.2017.09.008.Peer-Reviewed Original Research
2006
Monte Carlo Modeling of Cascade Gamma Rays in PET
Zhu X, Fakhri G. Monte Carlo Modeling of Cascade Gamma Rays in PET. 2011 IEEE Nuclear Science Symposium Conference Record 2006, 6: 3522-3525. DOI: 10.1109/nssmic.2006.353759.Peer-Reviewed Original ResearchCascade gamma raysGamma raysGamma-ray emitting isotopesDetector dead timeMonte Carlo modelPET imagingGamma eventsScatter fractionQuantitative PET imagingTorso phantomSingles ratesMonte Carlo simulationsDecrease of intensityHigh-activity regionsPhantom experimentsReconstructed volumePhantomRaysCarlo simulationsDead timeDetectorReconstructed imagesCascade typeImage intensityMonte
2005
Fast Monte Carlo Estimation of Patient and Detector Scatter and Crosstalk Contamination in SPECT Imaging
Ouyang J, Moore S, Park M, Fakhri G. Fast Monte Carlo Estimation of Patient and Detector Scatter and Crosstalk Contamination in SPECT Imaging. 2005, 3: 1560-1562. DOI: 10.1109/nssmic.2005.1596616.Peer-Reviewed Original ResearchDetector effectsEnergy windowTriple-energy window methodConvolution-based forced detectionPhoton interaction pointSimulate photon interactionsLower energy windowScattering mapCompton scatteringPhoton contributionEnergy binsPhoton interactionsMultiple photonsDetector scatterImaging isotopesCoherent scatteringAttenuation phantomMonte Carlo methodPhotoelectric effectInteraction pointPhantom experimentsDetectorCrosstalk contaminationScatteringCarlo method