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 designAlgorithmImages
2005
Spatial resolution, signal-to-noise ratio, and smoothing in multi-subject functional MRI studies
Scouten A, Papademetris X, Constable R. Spatial resolution, signal-to-noise ratio, and smoothing in multi-subject functional MRI studies. NeuroImage 2005, 30: 787-793. PMID: 16343951, DOI: 10.1016/j.neuroimage.2005.10.022.Peer-Reviewed Original ResearchConceptsSingle-subject studySpecific cortical regionsFunctional MRI studyBasic neuroscience studiesRandom effects analysisNeurosurgical interventionHemodynamic responseMRI studiesCortical activityCortical regionsFunctional MRIBrain functionFunctional anatomyNeurosurgical planningFunctional mappingSubtle activationClinical environmentGroup-level statisticsNeurophysiological underpinningsPartial volume effectsActivationNeuroscience studiesPatientsGroup statistics
1999
Composite image formation in z‐shimmed functional MR imaging
Constable R, Spencer D. Composite image formation in z‐shimmed functional MR imaging. Magnetic Resonance In Medicine 1999, 42: 110-117. PMID: 10398956, DOI: 10.1002/(sici)1522-2594(199907)42:1<110::aid-mrm15>3.0.co;2-3.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 ResearchMotion artifact in T2‐weighted fast spin‐echo images of the liver: Effect on image contrast and reduction of artifact using respiratory triggering in normal volunteers
Choe K, Smith R, Wilkens K, Constable R. Motion artifact in T2‐weighted fast spin‐echo images of the liver: Effect on image contrast and reduction of artifact using respiratory triggering in normal volunteers. Journal Of Magnetic Resonance Imaging 1997, 7: 298-302. PMID: 9090581, DOI: 10.1002/jmri.1880070207.Peer-Reviewed Original ResearchConceptsFast spin-echo imagesSpin-echo imagesMultiple small cystsT2-weighted sequencesSpin-echo T2-weighted sequencesPatient triggeringFast spin-echo T2-weighted sequencesT2-weighted fast spin-echo imagesHealthy volunteersSmall cystsNormal volunteersRespiratory motionLiverRespiratory cycleCystsVolunteersGallbladderSpleenRespiratory triggeringImproved visualizationMotion artifactsSD/NSignificant improvementFlow compensationIndividual cysts
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 Research
1994
Gradient moment nulling in fast spin echo
Hinks R, Constable R. Gradient moment nulling in fast spin echo. Magnetic Resonance In Medicine 1994, 32: 698-706. PMID: 7869891, DOI: 10.1002/mrm.1910320604.Peer-Reviewed Original ResearchFast Spin Echo STIR Imaging
Smith R, Constable R, Reinhold C, McCauley T, Lange R, McCarthy S. Fast Spin Echo STIR Imaging. Journal Of Computer Assisted Tomography 1994, 18: 209-213. PMID: 8126269, DOI: 10.1097/00004728-199403000-00007.Peer-Reviewed Original Research