Jonathan Langdon, MD
Assistant Professor of Radiology and Biomedical ImagingCards
About
Research
Publications
2026
The Utility of Elastography in Discriminating Stages of Liver Fibrosis and Risk Stratification in Patients With Primary Sclerosing Cholangitis: A Systematic Review
Hashemi P, Boyer J, Langdon J. The Utility of Elastography in Discriminating Stages of Liver Fibrosis and Risk Stratification in Patients With Primary Sclerosing Cholangitis: A Systematic Review. Journal Of Magnetic Resonance Imaging 2026, 63: 938-958. PMID: 41709322, DOI: 10.1002/jmri.70266.Peer-Reviewed Original ResearchConceptsPrimary sclerosing cholangitisVibration controlled transient elastographyMayo risk scoreStage of liver fibrosisRisk stratificationAcoustic radiation force impulseLiver fibrosisSclerosing cholangitisFibrosis biomarkersLiver stiffnessMagnetic resonance elastographyRisk stratification of patientsSystematic reviewAssessment of liver fibrosisPoint shear-wave elastographyTotal liver volumeStratification of patientsTechnical failure rateChronic autoimmune diseasePattern of fibrosisStaging liver fibrosisOperator-independent techniqueShear-wave elastographyBiliary stricturesLiver volume
2025
Imaging of Trauma in Pregnant Patients.
Langdon J, Chai N, Patel A, Steenburg S, Itani M, Katz D, Moshiri M, Revzin M. Imaging of Trauma in Pregnant Patients. RadioGraphics 2025, 45: e240043. PMID: 40966129, DOI: 10.1148/rg.240043.Peer-Reviewed Original ResearchConceptsPlacental abruptionPregnant patientsEvaluation of pregnant patientsPregnant trauma patientsImaging modalitiesElectronic fetal monitoringRisk of exposure to ionizing radiationExposure to ionizing radiationMaternal stabilizationFetal monitoringObstetric abnormalitiesRadiological evaluationFetal ageTrauma patientsClinical challengeGeneral radiologistsPotential riskPregnancyContrast mediumAccurate diagnosisImaging assessmentPatientsClinical concernManagement pathwayTraumatic injury
2024
Renal transplant ultrasound: assessment of complications and advanced applications
Langdon J, Sharbidre K, Garner M, Robbin M, Scoutt L. Renal transplant ultrasound: assessment of complications and advanced applications. Abdominal Radiology 2024, 50: 2558-2585. PMID: 39643733, DOI: 10.1007/s00261-024-04731-9.Peer-Reviewed Original ResearchRenal transplantationSurgical techniqueUltrasound evaluationSolid organ transplant proceduresComplication of renal transplantationLong-term complications of renal transplantationManagement of transplant patientsAssessment of complicationsComprehensive ultrasound evaluationLong-term complicationsRenal transplant evaluationOrgan transplant proceduresTransplant patientsUltrasound findingsSonographic findingsTransplant proceduresTransplant evaluationComplicationsTransplantationUltrasoundSurgeryPracticing radiologistsRelative prevalenceAllograftPatientsCoordinate-Independent 3-D Ultrasound Principal Stretch and Direction Imaging
Jeng G, Chen P, Hsieh M, Liu Z, Langdon J, Ahn S, Staib L, Stendahl J, Thorn S, Sinusas A, Duncan J, O'Donnell M. Coordinate-Independent 3-D Ultrasound Principal Stretch and Direction Imaging. IEEE Transactions On Biomedical Engineering 2024, 71: 3312-3323. PMID: 38941195, PMCID: PMC11637688, DOI: 10.1109/tbme.2024.3420220.Peer-Reviewed Original ResearchPrincipal stretchesAxial displacement componentsSpeckle tracking methodSpeckle tracking approachTracking methodRobust filterDisplacement componentsTissue incompressibilityDisplacement estimationStrain componentsDisplacement gradientsStrain informationLocalized diseased regionStrain imagingLagrangian strainLeast-squares methodTracking approachTracking frameworkCoordinate systemCardiac coordinate systemProbe orientationFilterHigher spatial resolutionCardiac datasetsEnhanced accuracyResidual Ultrasound-Enhancing Agents Mimicking Portal Venous Gas
Bitar R, Langdon J, Kaur M, Crandall I, McNamara R, Revzin M. Residual Ultrasound-Enhancing Agents Mimicking Portal Venous Gas. Ultrasound Quarterly 2024, 40: e00694. PMID: 39466239, DOI: 10.1097/ruq.0000000000000694.Peer-Reviewed Original ResearchConceptsUltrasound enhancing agentsPortal venous gasBowel ischemiaAbdominal ultrasoundVenous gasEchogenic fociContrast-enhanced echocardiographyEvaluation of cardiac functionPortal venous systemSeries of casesSonographic detectionCardiac functionDifferential diagnosisPortal veinVenous systemObservational studyLiver parenchymaPortal triadsVascular patencyBowelIschemiaEchocardiographyLiverUltrasoundMulti-Task Learning for Motion Analysis and Segmentation in 3D Echocardiography
Ta K, Ahn S, Thorn S, Stendahl J, Zhang X, Langdon J, Staib L, Sinusas A, Duncan J. Multi-Task Learning for Motion Analysis and Segmentation in 3D Echocardiography. IEEE Transactions On Medical Imaging 2024, 43: 2010-2020. PMID: 38231820, PMCID: PMC11514714, DOI: 10.1109/tmi.2024.3355383.Peer-Reviewed Original ResearchMulti-task learning networkCross-stitch unitsComposite loss functionAccurate motion estimationTask-specific networksMotion estimationSegmentation masksLearning networkLoss functionSegmentation stepEchocardiography datasetNetworkMotion displacementMotion analysisMultiple time framesTaskAnalysis pipelineSegmentsStrain measurementsDatasetRepresentation
2023
Delayed cancer diagnosis in the pregnant patient: navigating a complex medical and ethical dilemma
Revzin M, Solomon N, Langdon J, Czeyda-Pommersheim F, Menias C. Delayed cancer diagnosis in the pregnant patient: navigating a complex medical and ethical dilemma. Abdominal Radiology 2023, 48: 1599-1604. PMID: 36951988, DOI: 10.1007/s00261-023-03860-x.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsMelanoma in pregnancy
Czeyda-Pommersheim F, Kluger H, Langdon J, Menias C, VanBuren W, Leventhal J, Baumann R, Revzin M. Melanoma in pregnancy. Abdominal Radiology 2023, 48: 1740-1751. PMID: 36719425, DOI: 10.1007/s00261-022-03796-8.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsThyroid cancer in pregnancy: diagnosis, management, and treatment
Langdon J, Gupta A, Sharbidre K, Czeyda-Pommersheim F, Revzin M. Thyroid cancer in pregnancy: diagnosis, management, and treatment. Abdominal Radiology 2023, 48: 1724-1739. PMID: 36719426, DOI: 10.1007/s00261-023-03808-1.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsThyroid cancerRadioactive iodine exposureNon-pregnant patientsRole of CTUnique clinical challengesManagement of cancerSurgical interventionClinical challengePregnancyIodine exposureRadioactive iodineThyroid nodulesCancerFetusesNuclear imagingRadiologist's perspectiveTreatmentDiagnosisCareMothersRiskImagingManagementPatientsPrognosis
2022
Co-attention spatial transformer network for unsupervised motion tracking and cardiac strain analysis in 3D echocardiography
Ahn S, Ta K, Thorn S, Onofrey J, Melvinsdottir I, Lee S, Langdon J, Sinusas A, Duncan J. Co-attention spatial transformer network for unsupervised motion tracking and cardiac strain analysis in 3D echocardiography. Medical Image Analysis 2022, 84: 102711. PMID: 36525845, PMCID: PMC9812938, DOI: 10.1016/j.media.2022.102711.Peer-Reviewed Original ResearchConceptsSpatial transformer networkMotion trackingNoisy displacement fieldReliable motion estimationMotion tracking methodCardiac strain analysisTransformer networkDisplacement fieldDisplacement pathsMotion fieldTracking methodMotion estimationExperimental resultsStrain analysisSuperior performanceTemporal constraintsCardiac motionTrackingRegularization functionDependent featuresEchocardiography imagesNetworkPrior assumptionsField