Oliver Marcel Geier

  • MR Physicist; PhD
  • +47 23070279 / 22781120

Mob: +47 91539131


Publications 2024

Jørgensen KN, Nerland S, Slapø NB, Norbom LB, Mørch-Johnsen L, Wortinger LA, Barth C, Andreou D, Maximov II, Geier OM, Andreassen OA, Jönsson EG, Agartz I (2024)
Assessing regional intracortical myelination in schizophrenia spectrum and bipolar disorders using the optimized T1w/T2w-ratio
Psychol Med, 1-11 (in press)
DOI 10.1017/S0033291724000503, PubMed 38563302

Ness HT, Folvik L, Sneve MH, Grydeland H, Vidal-Piñeiro D, Raud L, Geier OM, Walhovd KB, Fjell AM (2024)
Recalled through this day but forgotten next week?-retrieval activity predicts durability of partly consolidated memories
Cereb Cortex, 34 (6)
DOI 10.1093/cercor/bhae233, PubMed 38937077

Padrela B, Mahroo A, Tee M, Sneve MH, Moyaert P, Geier O, Kuijer JPA, Beun S, Nordhøy W, Zhu YD, Buck MA, Hoinkiss DC, Konstandin S, Huber J, Wiersinga J, Rikken R, de Leeuw D, Grydeland H, Tippett L, Cawston EE, Ozturk-Isik E, Linn J, Brandt M, Tijms BM, van de Giessen EM et al. (2024)
Developing blood-brain barrier arterial spin labelling as a non-invasive early biomarker of Alzheimer's disease (DEBBIE-AD): a prospective observational multicohort study protocol
BMJ Open, 14 (3), e081635
DOI 10.1136/bmjopen-2023-081635, PubMed 38458785

Publications 2023

Folvik L, Sneve MH, Ness HT, Vidal-Piñeiro D, Raud L, Geier OM, Walhovd KB, Fjell AM (2023)
Sustained upregulation of widespread hippocampal-neocortical coupling following memory encoding
Cereb Cortex, 33 (8), 4844-4858
DOI 10.1093/cercor/bhac384, PubMed 36190442

Mo T, Brandal SHB, Geier OM, Engebråten O, Nilsen LB, Kristensen VN, Hole KH, Hompland T, Fleischer T, Seierstad T (2023)
MRI Assessment of Changes in Tumor Vascularization during Neoadjuvant Anti-Angiogenic Treatment in Locally Advanced Breast Cancer Patients
Cancers (Basel), 15 (18)
DOI 10.3390/cancers15184662, PubMed 37760629

Moltu SJ, Nordvik T, Rossholt ME, Wendel K, Chawla M, Server A, Gunnarsdottir G, Pripp AH, Domellöf M, Bratlie M, Aas M, Hüppi PS, Lapillonne A, Beyer MK, Stiris T, Maximov II, Geier O, Pfeiffer H (2023)
Arachidonic and docosahexaenoic acid supplementation and brain maturation in preterm infants; a double blind RCT
Clin Nutr, 43 (1), 176-186
DOI 10.1016/j.clnu.2023.11.037, PubMed 38061271

Voldsbekk I, Groote I, Zak N, Roelfs D, Geier O, Due-Tønnessen P, Løkken LL, Strømstad M, Blakstvedt TY, Kuiper YS, Elvsåshagen T, Westlye LT, Bjørnerud A, Maximov II (2023)
Corrigendum to "Sleep and sleep deprivation differentially alter white matter microstructure: A mixed model design utilising advanced diffusion modelling"
Neuroimage, 270, 119939
DOI 10.1016/j.neuroimage.2023.119939, PubMed 36841108

Publications 2022

Gleditsch J, Jervan Ø, Haukeland-Parker S, Tavoly M, Geier O, Holst R, Klok FA, Johannessen HH, Ghanima W, Hopp E (2022)
Effects of pulmonary rehabilitation on cardiac magnetic resonance parameters in patients with persistent dyspnea following pulmonary embolism
Int J Cardiol Heart Vasc, 40, 100995
DOI 10.1016/j.ijcha.2022.100995, PubMed 35345773

Ness HT, Folvik L, Sneve MH, Vidal-Piñeiro D, Raud L, Geier OM, Nyberg L, Walhovd KB, Fjell AM (2022)
Reduced Hippocampal-Striatal Interactions during Formation of Durable Episodic Memories in Aging
Cereb Cortex, 32 (11), 2358-2372
DOI 10.1093/cercor/bhab331, PubMed 34581398

Voldsbekk I, Bjørnerud A, Groote I, Zak N, Roelfs D, Maximov II, Geier O, Due-Tønnessen P, Bøen E, Kuiper YS, Løkken LL, Strømstad M, Blakstvedt TY, Bjorvatn B, Malt UF, Westlye LT, Elvsåshagen T, Grydeland H (2022)
Evidence for widespread alterations in cortical microstructure after 32 h of sleep deprivation
Transl Psychiatry, 12 (1), 161
DOI 10.1038/s41398-022-01909-x, PubMed 35422097

Publications 2021

Berger S, Andersen R, Jakobsen J, Geier OM, Abildgaard A, Dorenberg E (2021)
Precontrast Magnetic Resonance Imaging Findings and Assessment of Dynamic Contrast-Enhanced Magnetic Resonance Imaging in Low-and High-Flow Vascular Malformations
Journal of Vascular Anomalies, 2 (3), e019
DOI 10.1097/JOVA.0000000000000019, PublikaID 403

Gleditsch J, Jervan Ø, Tavoly M, Geier O, Holst R, Klok FA, Ghanima W, Hopp E (2021)
Association between myocardial fibrosis, as assessed with cardiac magnetic resonance T1 mapping, and persistent dyspnea after pulmonary embolism
Int J Cardiol Heart Vasc, 38, 100935
DOI 10.1016/j.ijcha.2021.100935, PubMed 35005213

Nerland S, Jørgensen KN, Nordhøy W, Maximov II, Bugge RAB, Westlye LT, Andreassen OA, Geier OM, Agartz I (2021)
Multisite reproducibility and test-retest reliability of the T1w/T2w-ratio: A comparison of processing methods
Neuroimage, 245, 118709
DOI 10.1016/j.neuroimage.2021.118709, PubMed 34848300

Publications 2020

de Lange C, Thrane KJ, Thomassen KS, Geier O, Nguyen B, Tomterstad A, Ording Müller LS, Thaulow E, Almaas R, Døhlen G, Suther KR, Möller T (2020)
Hepatic magnetic resonance T1-mapping and extracellular volume fraction compared to shear-wave elastography in pediatric Fontan-associated liver disease
Pediatr Radiol, 51 (1), 66-76
DOI 10.1007/s00247-020-04805-y, PubMed 33033916

Digernes I, Nilsen LB, Grøvik E, Bjørnerud A, Løvland G, Vik-Mo E, Meling TR, Saxhaug C, Helland Å, Jacobsen KD, Geier O, Emblem KE (2020)
Noise dependency in vascular parameters from combined gradient-echo and spin-echo DSC MRI
Phys Med Biol, 65 (22), 225020
DOI 10.1088/1361-6560/abb71a, PubMed 33200748

Hovden IT, Geier OM, Digernes I, Fuster-Garcia E, Løvland G, Vik-Mo E, Meling TR, Emblem KE (2020)
The impact of EPI-based distortion correction of dynamic susceptibility contrast MRI on cerebral blood volume estimation in patients with glioblastoma
Eur J Radiol, 132, 109278
DOI 10.1016/j.ejrad.2020.109278, PubMed 33010685

Latysheva A, Geier OM, Hope TR, Brunetti M, Micci F, Vik-Mo EO, Emblem KE, Server A (2020)
Diagnostic utility of Restriction Spectrum Imaging in the characterization of the peritumoral brain zone in glioblastoma: Analysis of overall and progression-free survival
Eur J Radiol, 132, 109289
DOI 10.1016/j.ejrad.2020.109289, PubMed 33002815

Nilsen LB, Digernes I, Grøvik E, Saxhaug C, Latysheva A, Geier O, Breivik B, Sætre DO, Jacobsen KD, Helland Å, Emblem KE (2020)
Responses in the diffusivity and vascular function of the irradiated normal brain are seen up until 18 months following SRS of brain metastases
Neurooncol Adv, 2 (1), vdaa028
DOI 10.1093/noajnl/vdaa028, PubMed 32642687

Voldsbekk I, Groote I, Zak N, Roelfs D, Geier O, Due-Tønnessen P, Løkken LL, Strømstad M, Blakstvedt TY, Kuiper YS, Elvsåshagen T, Westlye LT, Bjørnerud A, Maximov II (2020)
Sleep and sleep deprivation differentially alter white matter microstructure: A mixed model design utilising advanced diffusion modelling
Neuroimage, 226, 117540
DOI 10.1016/j.neuroimage.2020.117540, PubMed 33186715

Voldsbekk I, Maximov II, Zak N, Roelfs D, Geier O, Due-Tønnessen P, Elvsåshagen T, Strømstad M, Bjørnerud A, Groote I (2020)
Evidence for wakefulness-related changes to extracellular space in human brain white matter from diffusion-weighted MRI
Neuroimage, 212, 116682
DOI 10.1016/j.neuroimage.2020.116682, PubMed 32114147

Publications 2019

Lai X, Geier OM, Fleischer T, Garred Ø, Borgen E, Funke SW, Kumar S, Rognes ME, Seierstad T, Børresen-Dale AL, Kristensen VN, Engebraaten O, Köhn-Luque A, Frigessi A (2019)
Toward Personalized Computer Simulation of Breast Cancer Treatment: A Multiscale Pharmacokinetic and Pharmacodynamic Model Informed by Multitype Patient Data
Cancer Res, 79 (16), 4293-4304
DOI 10.1158/0008-5472.CAN-18-1804, PubMed 31118201

Switlyk MD, Salberg UB, Geier OM, Vlatkovic L, Lilleby W, Lyng H, Seierstad T (2019)
PTEN Expression in Prostate Cancer: Relationship With Clinicopathologic Features and Multiparametric MRI Findings
AJR Am J Roentgenol, 212 (6), 1206-1214
DOI 10.2214/AJR.18.20743, PubMed 30888866

Publications 2018

Digernes I, Grøvik E, Nilsen LB, Saxhaug C, Geier O, Reitan E, Sætre DO, Breivik B, Reese T, Jacobsen KD, Helland Å, Emblem KE (2018)
Brain metastases with poor vascular function are susceptible to pseudoprogression after stereotactic radiation surgery
Adv Radiat Oncol, 3 (4), 559-567
DOI 10.1016/j.adro.2018.05.005, PubMed 30370356

Suther KR, Hopp E, Geier O, Brun H, Nguyen B, Tomterstad AH, Smevik B, Fiane AE, Lindberg HL, de Lange C (2018)
Diffuse myocardial fibrosis in adolescents operated with arterial switch for transposition of the great arteries - A CMR study
Int J Cardiol, 276, 100-106
DOI 10.1016/j.ijcard.2018.11.107, PubMed 30527348

Publications 2015

Mutsaerts HJ, van Osch MJ, Zelaya FO, Wang DJ, Nordhøy W, Wang Y, Wastling S, Fernandez-Seara MA, Petersen ET, Pizzini FB, Fallatah S, Hendrikse J, Geier O, Günther M, Golay X, Nederveen AJ, Bjørnerud A, Groote IR (2015)
Multi-vendor reliability of arterial spin labeling perfusion MRI using a near-identical sequence: implications for multi-center studies
Neuroimage, 113, 143-52
DOI 10.1016/j.neuroimage.2015.03.043, PubMed 25818685

Ringstad G, Emblem KE, Geier O, Alperin N, Eide PK (2015)
Aqueductal Stroke Volume: Comparisons with Intracranial Pressure Scores in Idiopathic Normal Pressure Hydrocephalus
AJNR Am J Neuroradiol, 36 (9), 1623-30
DOI 10.3174/ajnr.A4340, PubMed 25977480

Ringstad G, Emblem KE, Geier O, Alperin N, Eide PK (2015)
Reply: To PMID 25977480
AJNR Am J Neuroradiol, 36 (9), 1633-4
DOI 10.3174/ajnr.A4488, PubMed 26251437

Publications 2014

Geier O, Weng AM, Ruff J, Machann W, Horn M, Hahn D, Spindler M, Beer M, Köstler H (2014)
Accurate Metabolic Images of the Human Myocardium by Means of 31P Magnetic Resonance Chemical Shift Imaging with Spatial Saturation Pulses
Concepts in Magnetic Resonance Part A, 42 (5), 187-195 (in press)
DOI 10.1002/cmr.a.21284, PublikaID 193

Hagtvedt T, Seierstad T, Lund KV, Løndalen AM, Bogsrud TV, Smith HJ, Geier OM, Holte H, Aaløkken TM (2014)
Diffusion-weighted MRI compared to FDG PET/CT for assessment of early treatment response in lymphoma
Acta Radiol, 56 (2), 152-8
DOI 10.1177/0284185114526087, PubMed 24585944

Nilsen LB, Fangberget A, Geier OM, Engebraaten O, Borgen E, Olsen DR, Seierstad T (2014)
Associations between tumor vascularization assessed by in vivo DCE-MRI and the presence of disseminated tumor cells in bone marrow in breast cancer patients at the time of diagnosis
J Magn Reson Imaging, 40 (6), 1382-91
DOI 10.1002/jmri.24502, PubMed 24470360

Publications 2013

Geier O, Weng AM, Ruff J, Machann W, Horn M, Hahn D, Spindler M, Beer M, Kostler H (2013)
Accurate Metabolic Images of the Human Myocardium by Means of P-31 Magnetic Resonance Chemical Shift Imaging with Spatial Saturation Pulses
Concepts Magn. Reson. Part A, 42 (5), 187-195
DOI 10.1002/cmr.a.21284

Geier O, Weng AM, Toepell A, Hahn D, Spindler M, Beer M, Köstler H (2013)
Acquisition-weighted chemical shift imaging improves SLOOP quantification of human cardiac phosphorus metabolites
Z Med Phys, 24 (1), 49-54
DOI 10.1016/j.zemedi.2013.01.002, PubMed 23375741

Kumar RP, Rijkhorst EJ, Geier O, Barratt D, Elle OJ (2013)

Machann W, Geier O, Koeppe S, O'Donnell T, Greiser A, Breunig F, Sandstede J, Hahn D, Koestler H, Beer M (2013)
Reproducibility of manual and semi-automated late enhancement quantification in patients with Fabry disease
Acta Radiol, 55 (2), 155-60
DOI 10.1177/0284185113505275, PubMed 24078459

Publications 2012

Hole KH, Axcrona K, Lie AK, Vlatkovic L, Geier OM, Brennhovd B, Knutstad K, Olsen DR, Seierstad T (2012)
Routine pelvic MRI using phased-array coil for detection of extraprostatic tumour extension: accuracy and clinical significance
Eur Radiol, 23 (4), 1158-66
DOI 10.1007/s00330-012-2669-x, PubMed 23114883

Nilsen LB, Fangberget A, Geier O, Seierstad T (2012)
Quantitative analysis of diffusion-weighted magnetic resonance imaging in malignant breast lesions using different b value combinations
Eur Radiol, 23 (4), 1027-33
DOI 10.1007/s00330-012-2687-8, PubMed 23111816

Publications 2010

Gutberlet M, Geier O, Stäb D, Ritter C, Beer M, Hahn D, Köstler H (2010)
SNR-optimized myocardial perfusion imaging using parallel acquisition for effective density-weighted saturation recovery imaging
Magn Reson Imaging, 28 (3), 341-50
DOI 10.1016/j.mri.2009.11.007, PubMed 20096527

Nilsen L, Fangberget A, Geier O, Olsen DR, Seierstad T (2010)
Diffusion-weighted magnetic resonance imaging for pretreatment prediction and monitoring of treatment response of patients with locally advanced breast cancer undergoing neoadjuvant chemotherapy
Acta Oncol, 49 (3), 354-60
DOI 10.3109/02841861003610184, PubMed 20397769

Publications 2008

Eilertsen K, Vestad LN, Geier O, Skretting A (2008)
A simulation of MRI based dose calculations on the basis of radiotherapy planning CT images
Acta Oncol, 47 (7), 1294-302
DOI 10.1080/02841860802256426, PubMed 18663645

Publications 2007

Geier OM, Hahn D, Köstler H (2007)
Parallel acquisition for effective density weighted imaging: PLANED imaging
MAGMA, 20 (1), 19-25
DOI 10.1007/s10334-006-0065-8, PubMed 17237943

Publications 2005

Haufe S, Prochnow D, Schneider D, Geier OM, Freude D, Stimming U (2005)
Polyphosphate composite: conductivity and NMR studies
Solid State Ionics, 176, 955-963
DOI 10.1016/j.ssi.2004.12.004, PublikaID 185

Spindler M, Schmidt M, Geier O, Sandstede J, Hahn D, Ertl G, Beer M (2005)
Functional and metabolic recovery of the right ventricle during Bosentan therapy in idiopathic pulmonary arterial hypertension
J Cardiovasc Magn Reson, 7 (5), 853-4
DOI 10.1080/10976640500295540, PubMed 16353449

Publications 2004

Geier O, Snurr RQ, Stallmach F, Kärger J (2004)
Boundary effects of molecular diffusion in nanoporous materials: a pulsed field gradient nuclear magnetic resonance study
J Chem Phys, 120 (1), 367-73
DOI 10.1063/1.1629276, PubMed 15267297

Publications 2003

Vasenkov S, Geier OM, Kärger J (2003)
Gas diffusion in zeolite beds: PFG NMR evidence for different tortuosity factors in the Knudsen and bulk regimes
Eur Phys J E, 12, 35-38
DOI 10.1140/epjed/e2003-01-009-1, PublikaID 183

Publications 2002

Geier OM, Vasenkov S, Freude D, Kärger J (2002)
PFG NMR observation of an extremely strong dependence of the ammonia self-diffusivity on its loading in H-ZSM-5
Journal of Catalysis, 213 (2), 321-323
DOI 10.1016/S0021-9517(02)00018-0, PublikaID 184

Geier OM, Vasenkov S, Kärger J (2002)
Pulsed field gradient nuclear magnetic resonance study of long–range diffusion in beds of NaX zeolite: Evidence for different apparent tortuosity factors in the Knudsen and bulk regimes
The Journal of Chemical Physics, 117 (5), 1935-1938
DOI 10.1063/1.1496479, PublikaID 182

Ngwa W, Geier O, Stallmach F, Naji L, Schiller J, Arnold K (2002)
Cation diffusion in cartilage measured by pulsed field gradient NMR
Eur Biophys J, 31 (1), 73-80
DOI 10.1007/s002490100184, PubMed 12046899

Publications 2001

Geier OM, Vasenkov S, Lehmann E, Kärger J, Schemmert U, Rakoczy RA, Weitkamp J (2001)
Interference Microscopy Investigation of the Influence of Regular Intergrowth Effects in MFI-Type Zeolites on Molecular Uptake
The Journal of Physical Chemistry B, 105, 10217-10222
DOI 10.1021/jp010777u, PublikaID 181

Nestle N, Galvosas P, Geier O, Dakkouri M, Zimmermann C, Kärger J (2001)
NMR studies of water diffusion and relaxation in hydrating slag-based construction materials
Magn Reson Imaging, 19 (3-4), 547-8
DOI 10.1016/s0730-725x(01)00301-0, PubMed 11445353

Nestle N, Galvosas P, Geier OM, Zimmermann C, Dakkouri M, Kärger J (2001)
Nuclear magnetic resonance study of diffusion and relaxation in hydrating white cement pastes of different water content
JOURNAL OF APPLIED PHYSICS, 89 (12), 8061-8065
DOI 10.1063/1.1375020, PublikaID 179

Vasenkov S, Böhlmann W, Galvosas P, Geier OM, Liu H, Kärger J (2001)
PFG NMR Study of Diffusion in MFI-Type Zeolites: Evidence of the Existence of the Existence of Intracrystalline Transport Barriers
The Journal of Physical Chemistry B, 105 (25), 5922-5927
DOI 10.1021/jp003899f, PublikaID 180

Vasenkov S, Galvosas P, Geier O, Nestle N, Stallmach F, Kärger J (2001)
Determination of genuine diffusivities in heterogeneous media using stimulated echo pulsed field gradient NMR
J Magn Reson, 149 (2), 228-33
DOI 10.1006/jmre.2001.2296, PubMed 11318621

Vasenkov S, Geier OM, Schemmert U, Kärger J, Rakoczy RA, Weitkamp J (2001)
Application of interference microscopy and monte carlo simulations for comparative studies of intracrystalline diffusion in zeolites
PublikaID 186

Publications 2000

Nestle N, Dakkouri M, Geier OM, Freude D, Kärger J (2000)
Blastfurnace slag cements: A construction material with very unusual nuclear spin relaxation behavior during hardening
Journal of Applied Physics , 88 (7), 4269-4273
DOI 10.1063/1.1288506 , PublikaID 178

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