G. Helms

发表

Quantitative FLASH MRI at 3T using a rational approximation of the Ernst equation

P. Dechent, G. Helms, H. Dathe, 2008, Magnetic resonance in medicine.

High‐resolution maps of magnetization transfer with inherent correction for RF inhomogeneity and T1 relaxation obtained from 3D FLASH MRI

P. Dechent, G. Helms, H. Dathe, 2008, Magnetic resonance in medicine.

A General Linear Relaxometry Model of R1 Using Imaging Data

A. Lutti, N. Weiskopf, M. Callaghan, 2014, Magnetic resonance in medicine.

Increased SNR and reduced distortions by averaging multiple gradient echo signals in 3D FLASH imaging of the human brain at 3T

P. Dechent, G. Helms, 2009, Journal of magnetic resonance imaging : JMRI.

Optimization and Validation of Methods for Mapping of the Radiofrequency Transmit Field at 3T

J. Finsterbusch, A. Lutti, N. Weiskopf, 2010, Magnetic resonance in medicine.

Widespread age-related differences in the human brain microstructure revealed by quantitative magnetic resonance imaging

Thomas H. B. FitzGerald, P. Smittenaar, Bogdan Draganski, 2014, Neurobiology of Aging.

Basal Cerebral Blood Volume during the Poststimulation Undershoot in BOLD MRI of the Human Brain

P. Dechent, J. Frahm, K. Merboldt, 2011, Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism.

hMRI – A toolbox for quantitative MRI in neuroscience and clinical research

Lars Ruthotto, E. Balteau, C. Phillips, 2019, NeuroImage.

In vivo quantification of the bound pool T1 in human white matter using the binary spin–bath model of progressive magnetization transfer saturation

Gunther Helms, G. Helms, G. Hagberg, 2009, Physics in medicine and biology.

Modeling the influence of TR and excitation flip angle on the magnetization transfer ratio (MTR) in human brain obtained from 3D spoiled gradient echo MRI

Peter Dechent, Gunther Helms, Henning Dathe, 2010, Magnetic resonance in medicine.

Regional speci fi city of MRI contrast parameter changes in normal ageing revealed by voxel-based quanti fi cation ( VBQ )

Richard S. J. Frackowiak, J. Ashburner, R. Frackowiak, 2011 .

Multiparametric brainstem segmentation using a modified multivariate mixture of Gaussians☆

Antoine Lutti, John Ashburner, Christian Lambert, 2013, NeuroImage: Clinical.

Correction for Residual Effects of B1+ Inhomogeniety on MT Saturation in FLASH-Based Multi-Parameter Mapping of the Brain

Gunther Helms, G. Helms, 2015 .

Neurobiological origin of spurious brain morphological changes: A quantitative MRI study

Antoine Lutti, John Ashburner, Ferath Kherif, 2016, Human brain mapping.

Micro-Structural Brain Alterations in Aviremic HIV+ Patients with Minor Neurocognitive Disorders: A Multi-Contrast Study at High Field

R. Meuli, C. Granziera, G. Krueger, 2013, PloS one.

Erratum to: Helms, dathe, kallenberg and dechent, high‐resolution maps of magnetization transfer with inherent correction for rf inhomogeneity and T1 relaxation obtained from 3D FLASH MRI. Magn Reson Med 2008 Dec;60(6):1396–1407

Peter Dechent, Gunther Helms, Henning Dathe, 2010 .

A precise and user‐independent quantification technique for regional comparison of single volume proton MR spectroscopy of the human brain

G Helms, G. Helms, 2000, NMR in biomedicine.

Structural abnormalities in the thalamus of migraineurs with aura: A multiparametric study at 3 T

C. Granziera, N. Hadjikhani, G. Krueger, 2014, Human brain mapping.

Brain tissue properties differentiate between motor and limbic basal ganglia circuits

J. Dukart, Ferath Kherif, Bogdan Draganski, 2014, Human brain mapping.

The principles of quantification applied to in vivo proton MR spectroscopy.

G. Helms, 2008, European journal of radiology.

Optimized high‐resolution mapping of magnetization transfer (MT) at 3 Tesla for direct visualization of substructures of the human thalamus in clinically feasible measurement time

P. Dechent, G. Helms, W. Schulz-Schaeffer, 2009, Journal of magnetic resonance imaging : JMRI.

Non-negative least squares computation for in vivo myelin mapping using simulated multi-echo spin-echo T2 decay data

I. Vavasour, A. Mackay, Alexander Rauscher, 2020, bioRxiv.

In vivo high field myelin water imaging: Investigating the T2 distribution at 7T

A. Mackay, Alexander Rauscher, G. Helms, 2018 .

Non‐negative least squares computation for in vivo myelin mapping using simulated multi‐echo spin‐echo T2 decay data

I. Vavasour, A. Mackay, Alexander Rauscher, 2020, NMR in biomedicine.

In vivo investigation of the multi‐exponential T2 decay in human white matter at 7 T: Implications for myelin water imaging at UHF

A. Mackay, Alexander Rauscher, G. Helms, 2020, NMR in biomedicine.

Idiopathic‐generalized epilepsy shows profound white matter diffusion—tensor imaging alterations

Walter Paulus, Holger Lerche, Gunther Helms, 2014, Human brain mapping.

Exact algebraization of the signal equation of spoiled gradient echo MRI

Gunther Helms, Henning Dathe, G. Helms, 2010, Physics in medicine and biology.

Multiparameter mapping of relaxation (R1, R2*), proton density and magnetization transfer saturation at 3 T: A multicenter dual‐vendor reproducibility and repeatability study

Nikolaus Weiskopf, Patrick Freund, Gunther Helms, 2020, Human brain mapping.

– A toolbox for using quantitative MRI in neuroscience and clinical research

Nikolaus Weiskopf, Antoine Lutti, Christophe Phillips, 2018 .

generalised epilepsy glutamine ( Glx ) in patients with idiopathic Increased thalamus levels of glutamate and

G. Helms, I. Savic, S. Kyaga, 2005 .

Reducing bias in dual flip angle T1‐mapping in human brain at 7T

R. Wirestam, G. Helms, Mads Andersen, 2020, Magnetic resonance in medicine.

Noninvasive estimation of tumour viability in a xenograft model of human neuroblastoma with proton magnetic resonance spectroscopy (1H MRS)

C. Spenger, P. Schweinhardt, G. Helms, 2003, British Journal of Cancer.

Individual voxel‐based subtype prediction can differentiate progressive supranuclear palsy from idiopathic parkinson syndrome and healthy controls

Walter Paulus, Peter Dechent, Gunther Helms, 2011, Human brain mapping.

Embodied neurology: an integrative framework for neurological disorders

Karl J. Friston, Klaas E. Stephan, Nikolaus Weiskopf, 2016, Brain : a journal of neurology.

Rapid Radiofrequency Field Mapping In Vivo Using Single-Shot STEAM MRI

Nikolaus Weiskopf, Peter Dechent, Jürgen Finsterbusch, 2008, Magnetic resonance in medicine.

Reducing bias in DREAM flip angle mapping in human brain at 7T by multiple preparation flip angles.

G. Helms, Hampus Olsson, M. Andersen, 2020, Magnetic resonance imaging.

Radiofrequenz-Pulse in der lokalisierten STEAM-Spektroskopie

G. Helms, 1994 .

hMRI -- A toolbox for using quantitative MRI in neuroscience and clinical research

Nikolaus Weiskopf, Antoine Lutti, John Ashburner, 2018 .

T2-based segmentation of periventricular paragraph sign volumes for quantification of proton magnetic paragraph sign resonance spectra of multiple sclerosis lesions.

G. Helms, 2003, Magma.

Voxel-based characterisation of white matter changes in ageing with multi-parameter mapping and DTI

Arno Villringer, Alfred Anwander, Nikolaus Weiskopf, 2010 .

B1+-correction of MT saturation maps optimized for 7T postmortem MRI of the brain

N. Weiskopf, G. Helms, L. Edwards, 2022, bioRxiv.

Erratum to Helms, Dathe, and Dechent. Quantitative FLASH MRI at 3 tesla using a rational approximation of the ernst equation. Magn Reson Med 2008;59:667–672.

Peter Dechent, Gunther Helms, Henning Dathe, 2010 .

Increased putamen and callosal motor subregion in treatment-naïve boys with Tourette syndrome indicates changes in the bihemispheric motor network.

Aribert Rothenberger, Jürgen Baudewig, Peter Dechent, 2011, Journal of child psychology and psychiatry, and allied disciplines.

Quantitative magnetic resonance imaging of brain anatomy and in vivo histology

N. Weiskopf, S. Mohammadi, G. Helms, 2021, Nature Reviews Physics.

hMRI – A toolbox for quantitative MRI in neuroscience and clinical research

Nikolaus Weiskopf, Antoine Lutti, Ferath Kherif, 2019, NeuroImage.

New tissue priors for improved automated classification of subcortical brain structures on MRI☆

Richard S. Frackowiak, Nikolaus Weiskopf, Antoine Lutti, 2016, NeuroImage.

Segmentation of human brain using structural MRI

Gunther Helms, G. Helms, 2016, Magnetic Resonance Materials in Physics, Biology and Medicine.

Disentangling in vivo the effects of iron content and atrophy on the ageing human brain

Richard S. Frackowiak, Nikolaus Weiskopf, Antoine Lutti, 2014, NeuroImage.

Regional specificity of MRI contrast parameter changes in normal ageing revealed by voxel-based quantification (VBQ)

Richard S. Frackowiak, Nikolaus Weiskopf, Ferath Kherif, 2011, NeuroImage.

Identification of Signal Bias in the Variable Flip Angle Method by Linear Display of the Algebraic Ernst Equation

Nikolaus Weiskopf, Peter Dechent, Gunther Helms, 2011, Magnetic resonance in medicine.

Unified segmentation based correction of R1 brain maps for RF transmit field inhomogeneities (UNICORT)

Nikolaus Weiskopf, Antoine Lutti, John Ashburner, 2011, NeuroImage.

No brain structure abnormalities in boys with Tourette's syndrome: A voxel‐based morphometry study

P. Dechent, V. Roessner, G. Helms, 2009, Movement disorders : official journal of the Movement Disorder Society.

Improved segmentation of deep brain grey matter structures using magnetization transfer (MT) parameter maps

Richard S. Frackowiak, Nikolaus Weiskopf, John Ashburner, 2009, NeuroImage.

Multi-site voxel-based morphometry — Not quite there yet

N. K. Focke, G. Helms, S. Kaspar, 2011, NeuroImage.

Creatine Deficiency in the Brain: A New, Treatable Inborn Error of Metabolism

G Helms, J. Frahm, G. Helms, 1994, Pediatric Research.

Increased thalamus levels of glutamate and glutamine (Glx) in patients with idiopathic generalised epilepsy

I Savic, G Helms, G. Helms, 2006, Journal of Neurology, Neurosurgery & Psychiatry.

MRS shows syndrome differentiated metabolite changes in human-generalized epilepsies

I Savic, Y Österman, G Helms, 2004, NeuroImage.

Folate receptor alpha defect causes cerebral folate transport deficiency: a treatable neurodegenerative disorder associated with disturbed myelin metabolism.

P. Dechent, G. Helms, R. Wevers, 2009, American journal of human genetics.

Retrospective artifact elimination in MEGA‐PRESS using a correlation approach

Sofie Tapper, Gunther Helms, Peter Lundberg, 2018, Magnetic resonance in medicine.

Untreated glioblastoma multiforme: increased myo-inositol and glutamine levels in the contralateral cerebral hemisphere at proton MR spectroscopy.

P. Dechent, J. Frahm, G. Helms, 2009, Radiology.

Cerebral involvement in axonal Charcot-Marie-Tooth neuropathy caused by mitofusin2 mutations

P. Dechent, J. Frahm, G. Helms, 2008, Journal of Neurology.

Localized proton magnetic resonance spectroscopy of a cerebellar tumor in a two-year-old child

J. Frahm, G. Helms, F. Hanefeld, 1996, Child's Nervous System.

Cortical and white matter correlates of language‐learning aptitudes

G. Helms, M. Horne, M. Nilsson, 2021, Human brain mapping.

Shifted dynamic interactions between subcortical nuclei and inferior frontal gyri during response preparation in persistent developmental stuttering

Jens Frahm, Walter Paulus, Martin Sommer, 2017, Brain Structure and Function.

Assessment of myelination in hypomyelinating disorders by quantitative MRI

P. Dechent, G. Helms, M. Henneke, 2012, Journal of magnetic resonance imaging : JMRI.

The impact of endurance training and table soccer on brain metabolites in schizophrenia

T. Schneider-Axmann, P. Falkai, P. Dechent, 2019, Brain Imaging and Behavior.

Cortical changes during the learning of sequences of simultaneous finger presses

J. Diedrichsen, F. Ullén, G. Helms, 2023, bioRxiv.

A New Targeted Model of Experimental Autoimmune Encephalomyelitis in the Common Marmoset

C. Wegner, G. Helms, W. Brück, 2016, Brain pathology.

MR Spectroscopy Shows Reduced Frontal Lobe Concentrations of N‐Acetyl Aspartate in Patients with Juvenile Myoclonic Epilepsy

I Savic, G Helms, D. Greitz, 2000, Epilepsia.

Restoration of motion‐related signal loss and line‐shape deterioration of proton MR spectra using the residual water as intrinsic reference

G Helms, A Piringer, G. Helms, 2001, Magnetic resonance in medicine.

Cerebral metabolic and structural alterations in hereditary spastic paraplegia with thin corpus callosum assessed by MRS and DTI

P. Dechent, J. Frahm, G. Helms, 2006, Neuroradiology.

A Novel SLC6A8 Mutation in a Large Family with X-Linked Intellectual Disability: Clinical and Proton Magnetic Resonance Spectroscopy Data of Both Hemizygous Males and Heterozygous Females.

P. Dechent, G. Helms, H. Ropers, 2013, JIMD reports.

In vivo proton MR spectroscopy findings specific for adenylosuccinate lyase deficiency

P. Dechent, G. Helms, M. van der Graaf, 2010, NMR in biomedicine.

Multi-parameter mapping of the human brain at 1mm resolution in less than 20 minutes

G Helms, N Weiskopf, N. Weiskopf, 2008 .

Example dataset for the hMRI toolbox

Nikolaus Weiskopf, Antoine Lutti, Ferath Kherif, 2019, Data in brief.

Contrast‐driven approach to intracranial segmentation using a combination of T2‐ and T1‐weighted 3D MRI data sets

Peter Dechent, Gunther Helms, Kai Kallenberg, 2006, Journal of magnetic resonance imaging : JMRI.

Localized proton magnetic resonance spectroscopy of cerebral abnormalities in children with carbohydrate‐deficient glycoprotein syndrome

J. Frahm, G. Helms, W. Hänicke, 1995, Acta paediatrica.

Comparison of MRI methods for measuring whole‐brain oxygen extraction fraction under different geometric conditions at 7T

R. Wirestam, G. Helms, Linda Knutsson, 2022, Journal of neuroimaging : official journal of the American Society of Neuroimaging.

MP3RAGE: Simultaneous mapping of T1 and B1+ in human brain at 7T

G. Helms, Mads Andersen, Hampus Olsson, 2022, Magnetic resonance in medicine.

Radiofrequency Bias Correction of Magnetization Prepared Rapid Gradient Echo MRI at 7.0 Tesla Using an External Reference in a Sequential Protocol

R. Wirestam, G. Helms, J. Lätt, 2021, Tomography.

Mapping magnetization transfer saturation (MTsat) in human brain at 7T: Protocol optimization under specific absorption rate constraints

R. Wirestam, G. Helms, Hampus Olsson, 2021, Magnetic resonance in medicine.

Cross-vendor transfer and RF coil comparison of a high-resolution MP2RAGE protocol for brain imaging at 7T

Hampus Olsson, Jimmy Lätt, Gunther Helms, 2020 .

Magnetization transfer (MT) of human brain at 7T in the context of a 3D multi-parameter mapping protocol

R. Wirestam, G. Helms, J. Lätt, 2019 .

Removing bias and increasing dynamic range in DREAM flip angle mapping at 7T

G. Helms, Hampus Olsson, M. Andersen, 2019 .

Tissue response curve‐shape analysis of dynamic glucose‐enhanced and dynamic contrast‐enhanced magnetic resonance imaging in patients with brain tumor

P. V. van Zijl, R. Wirestam, G. Helms, 2022, NMR in biomedicine.

Towards robust glucose chemical exchange saturation transfer imaging in humans at 3 T: Arterial input function measurements and the effects of infusion time

Nirbhay N. Yadav, P. V. van Zijl, R. Wirestam, 2021, NMR in biomedicine.

Arterial Input Functions and Tissue Response Curves in Dynamic Glucose-Enhanced (DGE) Imaging: Comparison Between glucoCEST and Blood Glucose Sampling in Humans

Karin Markenroth Bloch, Pia C. Sundgren, Peter C.M. van Zijl, 2018, Tomography.

Comparative Analysis of the Effects of Neurotrophic Factors CDNF and GDNF in a Nonhuman Primate Model of Parkinson’s Disease

Mart Saarma, Gunther Helms, Christina Schlumbohm, 2016, PloS one.

Reproducibility of the Structural Brain Connectome Derived from Diffusion Tensor Imaging

Chris Rorden, Walter Paulus, Julius Fridriksson, 2015, PloS one.

Correction of FLASH-based MT saturation in human brain for residual bias of B1-inhomogeneity at 3T

A. Lutti, N. Weiskopf, G. Helms, 2021, 2104.14878.

The Influence of Radio-Frequency Transmit Field Inhomogeneities on the Accuracy of G-ratio Weighted Imaging

F. J. Fritz, E. Balteau, S. Mohammadi, 2021, Frontiers in Neuroscience.

Identification of scyllo‐inositol in proton NMR spectra of human brain in vivo

J. Frahm, K. Merboldt, G. Helms, 1993, NMR in biomedicine.

Volume correction for edema in single‐volume proton MR spectroscopy of contrast‐enhancing multiple sclerosis lesions

G Helms, G. Helms, 2001, Magnetic resonance in medicine.

Differentiation of Typical and Atypical Parkinson Syndromes by Quantitative MR Imaging

C Trenkwalder, G Helms, W Paulus, 2011, American Journal of Neuroradiology.

Comparison of longitudinal metabolite relaxation times in different regions of the human brain at 1.5 and 3 Tesla

Michael Erb, Wolfgang Grodd, Albert Ludolph, 2003, Magnetic resonance in medicine.

Optimization and group comparison of RF ( B 1 ) mapping methods at 3 T

J. Finsterbusch, A. Lutti, N. Weiskopf, 2008 .

Analysis of 1.5 Tesla proton MR spectra of human brain using LCModel and an imported basis set.

G Helms, G. Helms, 1999, Magnetic resonance imaging.

T2-based segmentation of periventricular volumes for quantification of proton magnetic resonance spectra of multiple sclerosis lesions

G. Helms, 2003, Magnetic Resonance Materials in Physics, Biology and Medicine.

Regression analysis of metabolite concentrations estimated from localized proton MR spectra of active and chronic multiple sclerosis lesions

G Helms, G. Helms, P. Kivisäkk, 2000, Magnetic resonance in medicine.

Serial proton MR spectroscopy and diffusion tensor imaging in infantile Balo’s concentric sclerosis

P. Dechent, J. Frahm, G. Helms, 2008, Neuroradiology.

Tissue Properties from Quantitative MRI

Gunther Helms, G. Helms, 2015 .

Revisiting a historic human brain with magnetic resonance imaging – the first description of a divided central sulcus

R. Schweizer, J. Frahm, G. Helms, 2014, Front. Neuroanat..

Viewing the effective k-space coverage of MR images: phantom experiments with fast Fourier transform.

Jan Menke, Gunther Helms, Jörg Larsen, 2010, Magnetic resonance imaging.

Increased growth of colorectal liver metastasis following partial hepatectomy

G. Helms, S. Koenig, P. Krause, 2013, Clinical & Experimental Metastasis.

Simultaneous measurement of saturation and relaxation in human brain by repetitive magnetization transfer pulses

G. Helms, A. Piringer, 2005, NMR in biomedicine.

Diffusion characteristics of large molecules assessed by proton MRS on a whole-body MR system.

F. Schick, C. Claussen, J. Machann, 2004, Magnetic resonance imaging.

Metabolic Alterations in Brain Autopsies: Proton NMR Identification of Free Glycerol

J. Frahm, G. Helms, T. Michaelis, 1996, NMR in biomedicine.

Investigation and modeling of magnetization transfer effects in two‐dimensional multislice turbo spin echo sequences with low constant or variable flip angles at 3 T

Juergen Hennig, Matthias Weigel, Gunther Helms, 2009, Magnetic resonance in medicine.

Visualizing dopamine transporter integrity with iodine-123-FP-CIT SPECT in combination with high resolution MRI in the brain of the common marmoset monkey

Gunther Helms, Christina Schlumbohm, Eberhard Fuchs, 2012, Journal of Neuroscience Methods.

Growth pattern of experimental glioblastoma.

L. Salford, G. Helms, G. Skagerberg, 2020, Histology and histopathology.

Improved segmentation of deep brain grey matter structures using magnetization transfer (MT) parameter maps

Richard S. J. Frackowiak, J. Ashburner, Bogdan Draganski, 2009, NeuroImage.

Dorsal Column Embodied Neurology: an Integrative Framework for Neurological Disorders

Karl J. Friston, J. Ashburner, Bogdan Draganski, 2022 .

Brain Metabolite Changes in Patients with Relapsing-Remitting and Secondary Progressive Multiple Sclerosis: A Two-Year Follow-Up Study

P. Dechent, G. Helms, M. Bähr, 2016, PloS one.

Orientation dependent effects in spectra of human skeletal muscle recorded at 1.5 and 3 T

F. Schick, J. Machann, G. Helms, 2004 .

Pharmacokinetics of the MRI contrast agent gadobutrol in common marmoset monkeys (Callithrix jacchus)

P. Dechent, G. Helms, E. Fuchs, 2016, Journal of medical primatology.

Improved Visibility of the Subthalamic Nucleus on High-Resolution Stereotactic MR Imaging by Added Susceptibility (T2*) Contrast Using Multiple Gradient Echoes

P. Dechent, M. Knauth, P. Dechent, 2007, American Journal of Neuroradiology.

Magnetization transfer attenuation of creatine resonances in localized proton MRS of human brain in vivo

J. Frahm, G. Helms, 1999, NMR in biomedicine.