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
MR‐based PET attenuation correction using a combined ultrashort echo time/multi‐echo Dixon acquisition
Han P, Horng D, Gong K, Petibon Y, Kim K, Li Q, Johnson K, Fakhri G, Ouyang J, Ma C. MR‐based PET attenuation correction using a combined ultrashort echo time/multi‐echo Dixon acquisition. Medical Physics 2020, 47: 3064-3077. PMID: 32279317, PMCID: PMC7375929, DOI: 10.1002/mp.14180.Peer-Reviewed Original ResearchConceptsLinear attenuation coefficientPositron emission tomography attenuation correctionPhysical compartmental modelAttenuation correctionShort T<sub>2</sub> componentPET attenuation correctionRadial k-space trajectoryMagnetic resonance (MR)-based methodK-space trajectoriesRadial trajectoryK-spaceAttenuation coefficientDixon acquisitionsPositron emission tomographyWhole white matterMuting methodImage reconstructionImaging speedMR signalMRAC methodPositron emission tomography imagingCorrectionGray matter regionsPhantomMatter regions
2018
Attenuation correction for brain PET imaging using deep neural network based on Dixon and ZTE MR images
Gong K, Yang J, Kim K, Fakhri G, Seo Y, Li Q. Attenuation correction for brain PET imaging using deep neural network based on Dixon and ZTE MR images. Physics In Medicine And Biology 2018, 63: 125011. PMID: 29790857, PMCID: PMC6031313, DOI: 10.1088/1361-6560/aac763.Peer-Reviewed Original ResearchConceptsU-Net structureU-NetModified U-net structureAttenuation correctionDeep neural network methodBrain PET imagingPET attenuationDeep neural networksPatient data setsAttenuation coefficientDixon-based methodNeural network methodData setsConvolution moduleNetwork inputNeural networkDixon MRPET/MR hybrid systemImage reconstructionPET imagingNetwork methodNetworkNetwork approachNetwork structureQuantification errors
2017
Multi-Materials Decomposition using clinical Dualenergy CT
Zhao T, Kim K, Wu D, Kalra M, Fakhri G, Li Q. Multi-Materials Decomposition using clinical Dualenergy CT. 2017, 00: 1-4. DOI: 10.1109/nssmic.2017.8532936.Peer-Reviewed Original ResearchAttenuation coefficient functionDecomposition methodMulti-materials decomposition methodDomain decompositionMulti-materialAttenuation coefficientMaterial informationScanned objectX-ray sourcesMaterialsX-rayMedical applicationsEffective attenuation coefficientCoefficient functionsDecompositionMulti-material decompositionCoefficientDensity-based clustering
2014
Spectral CT Using Multiple Balanced K-Edge Filters
Rakvongthai Y, Worstell W, Fakhri G, Bian J, Lorsakul A, Ouyang J. Spectral CT Using Multiple Balanced K-Edge Filters. IEEE Transactions On Medical Imaging 2014, 34: 740-747. PMID: 25252276, PMCID: PMC4349342, DOI: 10.1109/tmi.2014.2358561.Peer-Reviewed Original ResearchConceptsK-edge filtersReconstructed attenuation coefficientsEnergy binsAttenuation coefficientMultiple energy binsX-ray sourcesX-ray tubeBack-projection reconstructionSpectral CT imagingTransmission matrixModel expectationsSinogram binsBeam hardeningComplex phantomsSpectral computed tomographyK-edgeAttenuation imagesSpectral CTCT scannerX-rayConventional detectorsBack-projectionSinogramPhantomCost-effective system designImprovement of Attenuation Correction in Time-of-Flight PET/MR Imaging with a Positron-Emitting Source
Mollet P, Keereman V, Bini J, Izquierdo-Garcia D, Fayad ZA, Vandenberghe S. Improvement of Attenuation Correction in Time-of-Flight PET/MR Imaging with a Positron-Emitting Source. Journal Of Nuclear Medicine 2014, 55: 329-336. PMID: 24434291, PMCID: PMC4010111, DOI: 10.2967/jnumed.113.125989.Peer-Reviewed Original Research
2013
Preclinical Evaluation of MR Attenuation Correction Versus CT Attenuation Correction on a Sequential Whole-Body MR/PET Scanner
Bini J, Izquierdo-Garcia D, Mateo J, Machac J, Narula J, Fuster V, Fayad ZA. Preclinical Evaluation of MR Attenuation Correction Versus CT Attenuation Correction on a Sequential Whole-Body MR/PET Scanner. Investigative Radiology 2013, 48: 313-322. PMID: 23296082, PMCID: PMC3638002, DOI: 10.1097/rli.0b013e31827a49ba.Peer-Reviewed Original ResearchConceptsPET scannerPositron emission tomography (PET) systemsEmpirical attenuation coefficientsEmission tomography systemAttenuation correctionPET attenuation correctionCTAC methodsTomography systemPhoton attenuationAnimal bedAttenuation coefficientProton densityDirect informationMR/PET imagesCT attenuation correctionLarge bone structuresSUV maximumCoregistered CT imagesAttenuation mapPET imagesQuantitative PETCorrectionScannerMagnetic resonanceTomographic images
1995
Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data
Pan T, King M, Penney B, Rajeevan N, Luo D, Case J. Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data. 1995, 4: 1563-1567 vol.4. DOI: 10.1109/nssmic.1994.474764.Peer-Reviewed Original ResearchAttenuation mapTruncation artifactsAttenuation coefficientCompton scattered photonsTransmission projection dataParallel hole collimatorTransmission image reconstructionScattered photonsHole collimatorSPECT systemBeam transmissionPhantom studyReprojection dataProjection angleTransmission dataProjection dataImage reconstructionEmissionReduction of truncation artifactsEmission dataPhotonsCollimatorAttenuationSimultaneous transmissionAugmented data
1994
Monte Carlo simulation of transmission studies using a planar source with a parallel collimator and a line source with a fan-beam collimator
Ljungberg M, Strand S, Rajeevan N, King M. Monte Carlo simulation of transmission studies using a planar source with a parallel collimator and a line source with a fan-beam collimator. IEEE Transactions On Nuclear Science 1994, 41: 1577-1584. DOI: 10.1109/23.322952.Peer-Reviewed Original ResearchFan-beam transmission imagingFan-beam collimatorsEnergy windowDown-scatterMonte Carlo methodMonte Carlo simulationsCorrection of attenuationTransmission measurementsTransmission imagesCollimatorAttenuation coefficientPlanar sourceCarlo methodNonhomogeneous regionsMonteRadionuclidesCorrectionAttenuationEmissionEnergyTransmission studiesParallel
1993
Monte Carlo simulation of transmission studies using planar source with parallel collimators and line source with fan-beam collimators
Ljungberg M, Strand S, Rajeevan N, King M. Monte Carlo simulation of transmission studies using planar source with parallel collimators and line source with fan-beam collimators. 1993, 1620-1624 vol.3. DOI: 10.1109/nssmic.1993.373564.Peer-Reviewed Original ResearchMonte Carlo simulationsFan-beam transmission imagingFan-beam collimatorsEnergy windowDown-scatterCorrection of attenuationTransmission measurementsTransmission imagesCollimatorAttenuation coefficientPlanar sourceCarlo simulationsNonhomogeneous regionsMonteRadionuclidesCorrectionAttenuationEmissionEnergyTransmission studiesParallel
1983
Stress wave propagation in bone
Pelker R, Saha S. Stress wave propagation in bone. Journal Of Biomechanics 1983, 16: 481-489. PMID: 6619165, DOI: 10.1016/0021-9290(83)90062-3.Peer-Reviewed Original ResearchConceptsStress wave propagation characteristicsStress wave propagationSingle compressive pulseWave propagation characteristicsSteel ballDynamic loadingStress wavesStrain gaugesWave characteristicsCompressive pulseWave propagationPropagation characteristicsHuman long bonesDynamic propertiesAttenuation coefficientPorosityLoadingCross-sectional area
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