Jonathan Langdon, MD
Assistant Professor of Radiology and Biomedical ImagingCards
About
Research
Publications
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 assumptionsFieldDiagnostic Accuracy of Shear-Wave Elastography for Breast Lesion Characterization in Women: A Systematic Review and Meta-Analysis
Pillai A, Voruganti T, Barr R, Langdon J. Diagnostic Accuracy of Shear-Wave Elastography for Breast Lesion Characterization in Women: A Systematic Review and Meta-Analysis. Journal Of The American College Of Radiology 2022, 19: 625-634.e0. PMID: 35358483, DOI: 10.1016/j.jacr.2022.02.022.Peer-Reviewed Original ResearchConceptsShear-wave elastographyDiagnostic accuracyBreast lesionsDiagnostic accuracy of shear-wave elastographyAccuracy of shear-wave elastographyStrain elastographyHierarchical summary receiver operating characteristic modelBI-RADS 3 lesionsQuality Assessment of Diagnostic Accuracy Studies 2Female breast lesionsDiagnostic Accuracy Studies 2Malignant breast lesionsReceiver operating characteristic curveStudies of diagnostic accuracyReceiver operating characteristic modelDiagnosis of breast cancerBreast lesion characterizationCurrent diagnostic techniquesSummary sensitivityAbnormal findingsRetrospective studyBreast cancerSociety guidelinesDiagnostic performanceBI-RADSSimultaneous Segmentation and Motion Estimation of Left Ventricular Myocardium in 3D Echocardiography Using Multi-task Learning
Ta K, Ahn SS, Stendahl JC, Langdon J, Sinusas AJ, Duncan JS. Simultaneous Segmentation and Motion Estimation of Left Ventricular Myocardium in 3D Echocardiography Using Multi-task Learning. Lecture Notes In Computer Science 2022, 13131: 123-131. PMID: 35759335, PMCID: PMC9221412, DOI: 10.1007/978-3-030-93722-5_14.Peer-Reviewed Original ResearchMotion estimationMulti-task learning networkMedical image analysis literatureMulti-task learningSingle-task learningMotion estimation techniqueImage analysis literatureComputer visionDecoding branchesFeature encoderLearning frameworkLearning networkLatent featuresAccurate segmentationSimultaneous segmentationEstimate motionImage pairsTask learningRealistic motion patternsVolumetric segmentationSegmentationMotion patternsTaskUnique taskLearning