2024
A Flow-based Truncated Denoising Diffusion Model for super-resolution Magnetic Resonance Spectroscopic Imaging
Dong S, Cai Z, Hangel G, Bogner W, Widhalm G, Huang Y, Liang Q, You C, Kumaragamage C, Fulbright R, Mahajan A, Karbasi A, Onofrey J, de Graaf R, Duncan J. A Flow-based Truncated Denoising Diffusion Model for super-resolution Magnetic Resonance Spectroscopic Imaging. Medical Image Analysis 2024, 99: 103358. PMID: 39353335, DOI: 10.1016/j.media.2024.103358.Peer-Reviewed Original ResearchDenoising diffusion modelsDeep learning-based super-resolution methodsLearning-based super-resolution methodsMulti-scale super-resolutionGenerative modelSuper-resolution methodsDeep learning modelsHigh-resolution magnetic resonance spectroscopic imagingHigh-quality imagesPost-processing approachSuper-resolutionFlow-based networksLearning modelsLow resolutionTruncation stepLow-resolution dataSharpness adjustmentNetworkSensitivity restrictionsUncertainty estimationDiffusion modelImagesCapabilitySampling processSpectroscopic imagingHigh-quality lipid suppression and B0 shimming for human brain 1H MRSI
Kumaragamage C, McIntyre S, Nixon T, De Feyter H, de Graaf R. High-quality lipid suppression and B0 shimming for human brain 1H MRSI. NeuroImage 2024, 300: 120845. PMID: 39276817, PMCID: PMC11540284, DOI: 10.1016/j.neuroimage.2024.120845.Peer-Reviewed Original ResearchOuter volume suppressionInner volume selectionSlice coverageField shimmingLipid suppressionMRSI acquisitionMagnetic field shimmingMagnetic resonance spectroscopic imagingSpherical harmonic fieldsBrain non-invasivelyAxial coverageMulti-coilRadio frequencyVolume suppressionB0 shimmingBrain coverageGradient coilsHarmonic fieldVolume selectionGradient insertShimming performancePhantom experimentsField variationsSpectroscopic imagingProton magnetic resonance spectroscopic imaging
2020
B0 shimming for in vivo magnetic resonance spectroscopy: Experts' consensus recommendations
Juchem C, Cudalbu C, de Graaf R, Gruetter R, Henning A, Hetherington H, Boer V. B0 shimming for in vivo magnetic resonance spectroscopy: Experts' consensus recommendations. NMR In Biomedicine 2020, 34: e4350. PMID: 32596978, DOI: 10.1002/nbm.4350.Peer-Reviewed Original Research
2011
Multislice 1H MRSI of the human brain at 7 T using dynamic B0 and B1 shimming
Boer VO, Klomp DW, Juchem C, Luijten PR, de Graaf RA. Multislice 1H MRSI of the human brain at 7 T using dynamic B0 and B1 shimming. Magnetic Resonance In Medicine 2011, 68: 662-670. PMID: 22162089, PMCID: PMC3306521, DOI: 10.1002/mrm.23288.Peer-Reviewed Original ResearchConceptsMagnetic fieldRadio frequency power depositionHigh magnetic fieldsMagnetic field shimmingRadio frequency controlUltra-high fieldMagnetic field inhomogeneityChemical shift resolutionMagnetic field homogeneityField shimmingPower depositionSpectroscopic imaging sequenceField inhomogeneityNew acquisition strategyField homogeneitySpectroscopic imagingShimmingInhomogeneityFieldDynamic B0Nutation angleHigh sensitivityB0ImagingImaging sequence
1998
In vivo 1H MR spectroscopic imaging and difusion weighted mri in experimental hydrocephalus
Braun K, de Graaf R, Vandertop W, Gooskens R, Tulleken K, Nicolay K. In vivo 1H MR spectroscopic imaging and difusion weighted mri in experimental hydrocephalus. Magnetic Resonance In Medicine 1998, 40: 832-839. PMID: 9840827, DOI: 10.1002/mrm.1910400608.Peer-Reviewed Original ResearchConceptsMR spectroscopic imagingExperimental hydrocephalusApparent diffusion coefficientInjection of kaolinIschemic metabolic changesWhite matter edemaDegree of ventriculomegalyHigher lactate levelsGray matter regionsProgressive ventriculomegalyCerebral edemaCerebral ischemiaVentricular enlargementHydrocephalic ratsKaolin injectionRat modelAccumulation of lactateDifferent time coursesLactate levelsCerebrospinal fluidCisterna magnaVentricular expansionHydrocephalusWhole brainSpectroscopic imaging