Yonghyun Ha
Associate Research ScientistCards
About
Research
Publications
2025
Decoupling Low Field Array Coil Using High Impedance Preamplifier
Sun C, Samardzija A, Ha Y, Gross R, Nixon T, McIntyre S, Sun H, Parra F, Galiana G, Constable R. Decoupling Low Field Array Coil Using High Impedance Preamplifier. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2025 DOI: 10.58530/2025/0903.Peer-Reviewed Original ResearchLocalized Gradients in an Open Field-Cycling Low-Field MRI: First Images
Samardzija A, Sun C, Ha Y, Gross R, Sun H, Parra F, Nixon T, Galiana G, Constable T. Localized Gradients in an Open Field-Cycling Low-Field MRI: First Images. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2025 DOI: 10.58530/2025/4257.Peer-Reviewed Original ResearchSpatial encodingTurbo spin echo pulse sequenceLow-field MRISpin-echo pulse sequenceImaging FOVFIRST imagesEcho pulse sequenceLeft-rightHigher spatial resolutionPulse sequenceSpatial resolutionScan timeLocal gradientsLower scan timeBreast imagingImaging feasibilityDetection sensitivityCancer detection sensitivityMagnetization
2024
Low-Field, Low-Cost, Point-of-Care Magnetic Resonance Imaging
Samardzija A, Selvaganesan K, Zhang H, Sun H, Sun C, Ha Y, Galiana G, Constable R. Low-Field, Low-Cost, Point-of-Care Magnetic Resonance Imaging. Annual Review Of Biomedical Engineering 2024, 26: 67-91. PMID: 38211326, DOI: 10.1146/annurev-bioeng-110122-022903.Peer-Reviewed Original ResearchComb EMI: a hardware-free, training-free approach to EMI correction
Sun H, Sun C, Ha Y, Samardzija A, Gross R, Galiana G, Constable R. Comb EMI: a hardware-free, training-free approach to EMI correction. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2024 DOI: 10.58530/2024/2691.Peer-Reviewed Original ResearchElectromagnetic interferenceTraining-freeNoise-dominated regionTraining dataDesign complexityExternal hardwareHardware-freeExtra hardwareHardwareDesign possibilitiesPoint-of-careExperimental dataMRI systemWhite noiseCancellationImprove costSparsitySampling windowSNRDesignTrainingPassive shieldingPortabilityCostMethodDesign of novel loop coil array for B0 and gradient field generation
Ha Y, Samardzija A, Sun C, Sun H, Gross R, Galiana G, Constable R. Design of novel loop coil array for B0 and gradient field generation. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2024 DOI: 10.58530/2024/2833.Peer-Reviewed Original ResearchInvestigation of Optimal Readout Frequency for the Non-Uniform B0 (NuBo) Field Cycling (FC) Scanner
Sun C, Ha Y, Samardzija A, Sun H, Gross R, Galiana G, Constable R. Investigation of Optimal Readout Frequency for the Non-Uniform B0 (NuBo) Field Cycling (FC) Scanner. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2024 DOI: 10.58530/2024/2852.Peer-Reviewed Original ResearchMovable Linear Gradients Optimized on Non-Planar B0 Slice Profiles Used for Improving Spatial Encoding in a Non-Linear Low-Field MRI
Samardzija A, Ha Y, Sun C, Sun H, Gross R, Galiana G, Constable R. Movable Linear Gradients Optimized on Non-Planar B0 Slice Profiles Used for Improving Spatial Encoding in a Non-Linear Low-Field MRI. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2024 DOI: 10.58530/2024/4076.Peer-Reviewed Original ResearchEncoding scheme design for gradient-free, nonlinear projection imaging using Bloch-Siegert RF spatial encoding in a low-field, open MRI system
Selvaganesan K, Ha Y, Sun H, Zhang Z, Sun C, Samardzija A, Galiana G, Constable R. Encoding scheme design for gradient-free, nonlinear projection imaging using Bloch-Siegert RF spatial encoding in a low-field, open MRI system. Scientific Reports 2024, 14: 3307. PMID: 38332252, PMCID: PMC10853509, DOI: 10.1038/s41598-024-53703-y.Peer-Reviewed Original ResearchConceptsBloch-SiegertSpatial encodingBloch-Siegert shiftGradient-freeLow-field imagesLow fieldsProjection imagesPhase shiftLoop coilEncoding settingsEncoding schemeEncoding trajectoriesLow-field MR imagingSpatial resolutionImage reconstructionOptimization algorithmEncodingMRI systemShift effectHardware setupMR systemOpen MRI systemScheme designAlgorithmImages
2023
Magnetic resonance imaging using a nonuniform Bo (NuBo) field-cycling magnet
Selvaganesan K, Wan Y, Ha Y, Wu B, Hancock K, Galiana G, Constable R. Magnetic resonance imaging using a nonuniform Bo (NuBo) field-cycling magnet. PLOS ONE 2023, 18: e0287344. PMID: 37319289, PMCID: PMC10270621, DOI: 10.1371/journal.pone.0287344.Peer-Reviewed Original ResearchConceptsInnovative data acquisitionMain magnetGradient coilsExperimental verificationEcho signalsInitial designField cyclingParallel imagingSuperior soft tissue contrastMagnetsInhomogeneous fieldsLow fieldsSoft tissue contrastReconstruction approachInhomogeneity effectsData acquisitionSpatial encodingPolarization phaseOpen MR systemPowerful noninvasive diagnostic toolSpin echo signalImage acquisitionFieldCoilNew approachEM shielded spiral RF coil design for array coil decoupling at ultra-low field MRI
Ha Y, Selvaganesan K, Sun C, Zhang Z, Samardzija A, Sun H, Galiana G, Constable T. EM shielded spiral RF coil design for array coil decoupling at ultra-low field MRI. Proceedings Of The International Society For Magnetic Resonance In Medicine ... Scientific Meeting And Exhibition. 2023 DOI: 10.58530/2023/1776.Peer-Reviewed Original Research
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