2024
Constrained alternating minimization for parameter mapping (CAMP)
Elsaid N, Dispenza N, Hu C, Peters D, Constable R, Tagare H, Galiana G. Constrained alternating minimization for parameter mapping (CAMP). Magnetic Resonance Imaging 2024, 110: 176-183. PMID: 38657714, PMCID: PMC11193090, DOI: 10.1016/j.mri.2024.04.029.Peer-Reviewed Original ResearchConceptsAlternating minimizationAccelerated parameter mappingImage qualityReconstructed image qualityEfficient reconstruction algorithmSacrificing model accuracyParameter mapsPhantom studyK-space samplingAcceleration datasetsK-spaceUndersampling artifactsCartesian acquisitionConsecutive imagesReconstruction algorithmIndividual imagesModel cost functionExponential decayEcho timeReconstruction methodCost functionReduce artifactsPhantomScan timeObjective functionEncoding 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 ResearchMeSH KeywordsAlgorithmsArtifactsImage Processing, Computer-AssistedMagnetic Resonance ImagingPhantoms, ImagingConceptsBloch-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 designAlgorithmImagesMultimodal measures of spontaneous brain activity reveal both common and divergent patterns of cortical functional organization
Vafaii H, Mandino F, Desrosiers-Grégoire G, O’Connor D, Markicevic M, Shen X, Ge X, Herman P, Hyder F, Papademetris X, Chakravarty M, Crair M, Constable R, Lake E, Pessoa L. Multimodal measures of spontaneous brain activity reveal both common and divergent patterns of cortical functional organization. Nature Communications 2024, 15: 229. PMID: 38172111, PMCID: PMC10764905, DOI: 10.1038/s41467-023-44363-z.Peer-Reviewed Original Research
2000
Accurate alignment of functional EPI data to anatomical MRI using a physics-based distortion model
Studholme C, Constable R, Duncan J. Accurate alignment of functional EPI data to anatomical MRI using a physics-based distortion model. IEEE Transactions On Medical Imaging 2000, 19: 1115-1127. PMID: 11204849, DOI: 10.1109/42.896788.Peer-Reviewed Original Research
1999
Analysis ofJCoupling-Induced Fat Suppression in DIET Imaging
Stables L, Kennan R, Anderson A, Constable R, Gore J. Analysis ofJCoupling-Induced Fat Suppression in DIET Imaging. Journal Of Magnetic Resonance 1999, 136: 143-151. PMID: 9986756, DOI: 10.1006/jmre.1998.1628.Peer-Reviewed Original Research
1997
Improved activation maps via the elimination of motion effects through time‐domain mixing of data in conventional gradient echo functional MRI
Constable R. Improved activation maps via the elimination of motion effects through time‐domain mixing of data in conventional gradient echo functional MRI. Magnetic Resonance In Medicine 1997, 38: 628-637. PMID: 9324330, DOI: 10.1002/mrm.1910380417.Peer-Reviewed Original Research
1995
Functional MR imaging using gradient‐echo echo‐planar imaging in the presence of large static field inhomogeneities
Constable R. Functional MR imaging using gradient‐echo echo‐planar imaging in the presence of large static field inhomogeneities. Journal Of Magnetic Resonance Imaging 1995, 5: 746-752. PMID: 8748497, DOI: 10.1002/jmri.1880050622.Peer-Reviewed Original ResearchAn roc approach for evaluating functional brain mr imaging and postprocessing protocols
Constable R, Skudlarski P, Gore J. An roc approach for evaluating functional brain mr imaging and postprocessing protocols. Magnetic Resonance In Medicine 1995, 34: 57-64. PMID: 7674899, DOI: 10.1002/mrm.1910340110.Peer-Reviewed Original Research
1994
Development and evaluation of tracking algorithms for cardiac wall motion analysis using phase velocity MR imaging
Constable R, Rath K, Sinusas A, Gore J. Development and evaluation of tracking algorithms for cardiac wall motion analysis using phase velocity MR imaging. Magnetic Resonance In Medicine 1994, 32: 33-42. PMID: 8084235, DOI: 10.1002/mrm.1910320106.Peer-Reviewed Original Research
1991
A quantitative comparison of the TERA modeling and DFT magnetic resonance image reconstruction techniques
Smith M, Nichols S, Constable R, Henkelman R. A quantitative comparison of the TERA modeling and DFT magnetic resonance image reconstruction techniques. Magnetic Resonance In Medicine 1991, 19: 1-19. PMID: 2046524, DOI: 10.1002/mrm.1910190102.Peer-Reviewed Original ResearchConceptsImage reconstruction techniquesModeling techniquesData reconstructionImage reconstructionDiscrete Fourier transform algorithmReconstruction approachAlternative reconstruction methodTransform algorithmSuccess of modelingData setsReconstruction methodModeling methodFourier transform algorithmMagnetic resonance imagesData lengthReconstruction techniqueFinite data lengthResonance imagesProblem areasTruncation artifactsModelingAlgorithmArtifactsTwo-dimensional modelingOne-dimensional modelingData extrapolation for truncation artifact removal
Constable R, Henkelman R. Data extrapolation for truncation artifact removal. Magnetic Resonance In Medicine 1991, 17: 108-118. PMID: 2067388, DOI: 10.1002/mrm.1910170115.Peer-Reviewed Original Research