Leif Østergaard

  1. Journal article › Research › Not peer-reviewed
  2. Published

    A MRI-compatible stereotaxic localizer box enables high-precision stereotaxic procedures in pigs. / Bjarkam, Carsten Reidies; Cancian, G.; Larsen, M.; Rosendahl, F.; Ettrup, Kåre Schmidt Ettrup; Zeidler, Dora; Blankholm, Anne Dorte; Østergaard, Leif; Sunde, Niels; Sørensen, Jens Christian H.

    In: Journal of Neuroscience Methods, Vol. 139, No. 2, 2004, p. 293-298.

    Research output: ResearchJournal article

  3. Published

    Cerebral blood flow in volunteers measured by PET and Xe CT/CBF : A comparison. / Bergholt, Bo; Østergaard, Leif; Oettingen, Gorm von; Johannsen, P.; Poulsen, P.H.; Bundgaard, H.; Asboe, H.; Cold, Georg; Gjedde, Albert; Gyldensted, C.; Astrup, Jens.

    In: Keio Journal of Medicine, Vol. 49, No. Suppl 1, 2000, p. 55-57.

    Research output: ResearchJournal article

  4. Published

    Cerebral hemodynamics in a healthy population measured by dynamic susceptibility contrast MR imaging. / Helenius, J.; Perkio, J.; Soinne, L.; Østergaard, Leif; Carano, R.A.; Salonen, O.; Savolainen, S.; Kaste, M.; Aronen, H.J.; Tatlisumak, T.

    In: Acta Radiologica, Vol. 44, 2003, p. 538-546.

    Research output: ResearchJournal article

  5. Published

    Cerebral perfusion imaging by bolus tracking. / Østergaard, Leif.

    In: Topics in Magnetic Resonance Imaging, Vol. 15, No. 1, 2004, p. 3-9.

    Research output: ResearchJournal article

  6. Published

    New Developments in Perfusion Imaging by Bolus Tracking. / Østergaard, Leif.

    In: Journal of Neuroradiology, Vol. 32, No. 5, 2005, p. 315-20.

    Research output: ResearchJournal article

  7. Published

    Nye funktionelle MR-teknikker. Specielt med henblik på akut apopleksibehandling. / Østergaard, Leif; Røhl, Lisbeth; Andersen, Grethe.

    In: Maanedsskrift for Praktisk Laegegerning, Vol. 82, 2004, p. 46-61.

    Research output: ResearchJournal article

  8. Published
  9. Journal article › Research › Peer-reviewed
  10. Published

    A fractal based model of diffusion MRI in cortical grey matter. / Hansen, Brian; Østergaard, Leif; Vestergaard-Poulsen, Peter.

    In: Diffusion Fundamentals, Vol. 11, 2009, p. 1-23.

    Research output: Research - peer-reviewJournal article

  11. Published

    A multicenter, randomized, double-blind, placebo-controlled trial to test efficacy and safety of magnetic resonance imaging-based thrombolysis in wake-up stroke (WAKE-UP). / Thomalla, Götz; Fiebach, Jochen B; Østergaard, Leif; Pedraza, Salvador; Thijs, Vincent; Nighoghossian, Norbert; Roy, Pascal; Muir, Keith W; Ebinger, Martin; Cheng, Bastian; Galinovic, Ivana; Cho, Tae-Hee; Puig, Josep; Boutitie, Florent; Simonsen, Claus Z; Endres, Matthias; Fiehler, Jens; Gerloff, Christian; WAKE-UP investigators.

    In: International Journal of Stroke, Vol. 9, No. 6, 08.2014, p. 829-36.

    Research output: Research - peer-reviewJournal article

  12. Published

    Abnormal intravoxel cerebral blood flow heterogeneity in human ischemic stroke determined by dynamic susceptibility contrast magnetic resonance imaging. / Perkiö, Jussi; Soinne, Lauri; Østergaard, Leif; Helenius, Johanna; Kangasmäki, Aki; Martinkauppi, Sami; Salonen, Oili; Savolainen, Sauli; Kaste, Markku; Tatlisumak, Turgut; Aronen, Hannu J.

    In: Stroke; a journal of cerebral circulation, Vol. 36, No. 1, 2005, p. 44-9.

    Research output: Research - peer-reviewJournal article

  13. Published

    Absolute cerebral blood flow and blood volume measured by magnetic resonance imaging bolus tracking: comparison with positron emission tomography values. / Østergaard, Leif; Smith, D F; Vestergaard-Poulsen, Peter; Hansen, Søren Baarsgaard; Gee, A D; Gjedde, A; Gyldensted, C.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 18, No. 4, 1998, p. 425-32.

    Research output: Research - peer-reviewJournal article

  14. Published
  15. Published

    Accumulation of magnetic iron oxide nanoparticles coated with variably sized polyethylene glycol in murine tumors. / Larsen, Esben Kjær Unmack; Nielsen, Thomas; Wittenborn, Thomas; Rydtoft, Louise Munk; Lokanathan, Arcot R.; Hansen, Line; Østergaard, Leif; Kingshott, Peter; Howard, Kenneth A; Besenbacher, Flemming; Nielsen, Niels Christian; Kjems, Jørgen.

    In: Nanoscale, Vol. 4, No. 7, 06.03.2012, p. 2352-2361 .

    Research output: Research - peer-reviewJournal article

  16. Published

    Accuracy and reliability assessment of CT and MR perfusion analysis software using a digital phantom. / Kudo, Kohsuke; Christensen, Søren; Sasaki, Makoto; Østergaard, Leif; Shirato, Hiroki; Ogasawara, Kuniaki; Wintermark, Max; Warach, Steven; Stroke Imaging Repository (STIR) Investigators.

    In: Radiology, Vol. 267, No. 1, 04.2013, p. 201-11.

    Research output: Research - peer-reviewJournal article

  17. Published

    Acute Stroke : Automatic Perfusion Lesion Outlining Using Level Sets. / Mouridsen, Kim; Nagenthiraja, Kartheeban; Jónsdóttir, Kristjana Yr; Ribe, Lars R; Neumann, Anders B; Hjort, Niels; Østergaard, Leif.

    In: Radiology, Vol. 269, No. 2, 17.05.2013, p. 404-12.

    Research output: Research - peer-reviewJournal article

  18. Published

    Acute Stroke Imaging Research Roadmap II. / Wintermark, Max; Albers, Gregory W; Broderick, Joseph P; Demchuk, Andrew M; Fiebach, Jochen B; Fiehler, Jens; Grotta, James C; Houser, Gary; Jovin, Tudor G; Lees, Kennedy R; Lev, Michael H; Liebeskind, David S; Luby, Marie; Muir, Keith W; Parsons, Mark W; von Kummer, Rüdiger; Wardlaw, Joanna M; Wu, Ona; Yoo, Albert J; Alexandrov, Andrei V; Alger, Jeffry R; Aviv, Richard I; Bammer, Roland; Baron, Jean-Claude; Calamante, Fernando; Campbell, Bruce C V; Carpenter, Trevor C; Christensen, Søren; Copen, William A; Derdeyn, Colin P; Haley, E Clarke; Khatri, Pooja; Kudo, Kohsuke; Lansberg, Maarten G; Latour, Lawrence L; Lee, Ting-Yim; Leigh, Richard; Lin, Weili; Lyden, Patrick; Mair, Grant; Menon, Bijoy K; Michel, Patrik; Mikulik, Robert; Nogueira, Raul G; Østergaard, Leif; Pedraza, Salvador; Riedel, Christian H; Rowley, Howard A; Sanelli, Pina C; Sasaki, Makoto; Saver, Jeffrey L; Schaefer, Pamela W; Schellinger, Peter D; Tsivgoulis, Georgios; Wechsler, Lawrence R; White, Philip M; Zaharchuk, Greg; Zaidat, Osama O; Davis, Stephen M; Donnan, Geoffrey A; Furlan, Anthony J; Hacke, Werner; Kang, Dong-Wha; Kidwell, Chelsea; Thijs, Vincent N; Thomalla, Götz; Warach, Steven J; For the Stroke Imaging Research (STIR) and Virtual International Stroke Trials Archive (VISTA)-Imaging Investigators.

    In: Stroke; a journal of cerebral circulation, Vol. 44, No. 9, 16.07.2013, p. 2628-39.

    Research output: Research - peer-reviewJournal article

  19. Published

    Acute stroke imaging research roadmap. / Wintermark, Max; Albers, Gregory W.; Alexandrov, Alexandrei V.; Alger, Jeffrey W.; Bammer, Roland; Baron, Jean-Claude; Davis, Steven; Demaerschalk, Bart; Derdeyn, Colin P.; Donnan, Geoffrey A.; Eastwood, James D.; Fiebach, Jochen B.; Fisher, Marc; Furie, Karen L.; Goldmakher, Gregory V.; Hacke, Werner; Kidwell, Chelsea C.; Kloska, Stephen P.; Köhrmann, Martin; Koroshetz, Walter; Lee, Ting-Yim; Lees, Kennedy R.; Lev, Michael H.; Liebeskind, David S; Østergaard, Leif; Powers, William J; Provenzale, James; Schellinger, Peter; Silbergleit, Robert; Sorensen, Alma Gregory; Wardlaw, Joanna; Wu, Ona; Warach, Steven.

    In: Stroke, Vol. 39, No. 5, 2008, p. 1621-8.

    Research output: Research - peer-reviewJournal article

  20. Published

    Acute stroke imaging research roadmap. / Wintermark, Max; Albers, Gregory W.; Alexandrov, Alexandrei V.; Alger, Jeffrey R.; Bammer, Roland; Baron, Jean-Claude; Davis, Steven; Damaerschack, Bart; Derdeyn, Colin P.; Donnan, Geoffrey A.; Eastwood, James D.; Fiebach, Jochen B.; Fisher, Marc; Furie, Karen L.; Goldmakher, Gregory W.; Hacke, Werner; Kidwell, Chelsea C.; Kloska, Stephen P.; Köhrman, Martin; Koroshetz, Walter; Lee, Ting-Yim; Lees, Kennedy R; Lev, Michael H.; Liebeskind, David S.; Østergaard, Leif; Powers, William J.; Provenzale, James; Schellinger, Peter; Silbergleit, Robert; Sorensen, Alma Gregory; Wardlaw, Joanna; Wu, Ona; Warach, Steven.

    In: American Journal of Neuroradiology, Vol. 29, No. 5, 2008, p. e23-e30.

    Research output: Research - peer-reviewJournal article

  21. Published

    An evaluation of the time dependence of the anisotropy of the water diffusion tensor in acute human ischemia. / Zelaya, F; Flood, N; Chalk, J B; Wang, D; Doddrell, D M; Strugnell, W; Benson, M; Østergaard, Leif; Semple, J; Eagle, S.

    In: Magnetic Resonance Imaging, Vol. 17, No. 3, 1999, p. 331-48.

    Research output: Research - peer-reviewJournal article

  22. Published

    Analysis of Partial Volume Effects on Arterial Input Functions Using Gradient Echo: A Simulation Study. / Kjølby, Birgitte Fuglsang; Mikkelsen, Irene Klærke; Pedersen, Michael; Østergaard, Leif; Kiselev, Vaelrij.

    In: Magnetic Resonance in Medicine, Vol. 61, No. 6, 2009, p. 1300-9.

    Research output: Research - peer-reviewJournal article

  23. Published

    Applying instance-based techniques to prediction of final outcome in acute stroke. / Gottrup, Christian; Thomsen, Knud; Locht, Peter; Wu, Ona; Sorensen, A Gregory; Koroshetz, Walter J; Østergaard, Leif.

    In: Artificial Intelligence in Medicine, Vol. 33, No. 3, 2005, p. 223-36.

    Research output: Research - peer-reviewJournal article

  24. Published

    Assessing Response to Stroke Thrombolysis : Validation of 24-Hour Multimodal Magnetic Resonance Imaging. / Campbell, Bruce C. V.; Tu, Hans T. H. ; Christensen, Søren ; Desmond, Patricia M.; Levi, Christopher R.; Blandin, Christopher F.; Hjort, Niels; Ashkanian, Mahmoud; Sølling, Christine; Donnan, Geoffrey A.; Davis, Stephen M. ; Østergaard, Leif; Parsons, Mark W.

    In: Archives of Neurology, Vol. 69, No. 1, 01.01.2012, p. 46-50.

    Research output: Research - peer-reviewJournal article

  25. Published

    Assessing the outcome of stroke : a comparison between MRI and clinical stroke scales. / Nuutinen, J; Liu, Y; Laakso, MP; Karonen, JO; Roivainen, R; Vanninen, RL; Partanen, K; Østergaard, Leif; Sivenius, J; Aronen, HJ.

    In: Acta Neurologica Scandinavica, Vol. 113, No. 2, 2006, p. 100-107.

    Research output: Research - peer-reviewJournal article

  26. Published

    Assessment of baseline hemodynamic parameters within infarct progression areas in acute stroke patients using perfusion-weighted MRI. / Ritzenthaler, T; Cho, TH; Wiart, M; Berthiller, J; Østergaard, Leif; Hermier, M; Derex, L; Berthezéne, Y; Nighoghossian, Norbert.

    In: Neuroradiology, Vol. 53, No. 8, 27.08.2011, p. 571-576.

    Research output: Research - peer-reviewJournal article

  27. Published

    Assessment of ischemic penumbra in patients with hyperacute stroke using amide proton transfer (APT) chemical exchange saturation transfer (CEST) MRI. / Tietze, Anna; Blicher, Jakob; Mikkelsen, Irene Klærke; Østergaard, Leif; Strother, Megan K; Smith, Seth A; Donahue, Manus J.

    In: N M R in Biomedicine (Online), Vol. 27, No. 2, 02.2014, p. 163-174.

    Research output: Research - peer-reviewJournal article

  28. Published

    Assessment of regional cerebral blood flow by dynamic susceptibility contrast MRI using different deconvolution techniques. / Wirestam, R.; Andersson, L.; Østergaard, Leif; Bolling, M.; Aunola, J.; Lindgren, A.; Geijer, B.; Holtås, S.; Ståhlberg, F.

    In: Magnetic Resonance in Medicine, Vol. 43, No. 5, 2000, p. 691-700.

    Research output: Research - peer-reviewJournal article

  29. E-pub ahead of print

    Assessment of tumor oxygenation and its impact on treatment response in bevacizumab-treated recurrent glioblastoma. / Bonekamp, David; Mouridsen, Kim; Radbruch, Alexander; Kurz, Felix T; Eidel, Oliver; Wick, Antje; Schlemmer, Heinz-Peter; Wick, Wolfgang; Bendszus, Martin; Østergaard, Leif; Kickingereder, Philipp.

    In: Journal of Cerebral Blood Flow and Metabolism, 09.02.2016.

    Research output: Research - peer-reviewJournal article

  30. Published

    Automated Estimation of Salvageable Tissue : Comparison with Expert Readers. / Hansen, Mikkel Bo; Nagenthiraja, Kartheeban; Ribe, Lars Riisgaard; Hougaard, Kristina Dupont; Østergaard, Leif; Mouridsen, Kim.

    In: Journal of Magnetic Resonance Imaging, Vol. 43, No. 1, 01.2016, p. 220-228.

    Research output: Research - peer-reviewJournal article

  31. Published

    Automated decision-support system for prediction of treatment responders in acute ischemic stroke. / Nagenthiraja, Kartheeban; Walcott, B. P. ; Hansen, Mikkel Bo; Østergaard, Leif; Mouridsen, Kim.

    In: Frontiers in Neurology, Vol. 4, 140, 2013.

    Research output: Research - peer-reviewJournal article

  32. Published

    Automatic selection of arterial input function using cluster analysis. / Mouridsen, Kim; Christensen, Søren; Gyldensted, Louise; Østergaard, Leif.

    In: Magnetic Resonance in Medicine, Vol. 55, No. 3, 2006, p. 524-531.

    Research output: Research - peer-reviewJournal article

  33. Published

    Bayesian estimation of perfusion parameters using a physiological model for the microvasculature. / Mouridsen, Kim; Friston, Karl; Hjort, Niels; Gyldensted, Louise; Østergaard, Leif; Kiebel, Stefan.

    In: NeuroImage, Vol. 33, No. 2, 2006, p. 570-579.

    Research output: Research - peer-reviewJournal article

  34. Published

    Bayesian regularization of diffusion tensor images. / Frandsen, Jesper; Hobolth, Asger; Østergaard, Leif; Vestergaard-Poulsen, Peter; Jensen, Eva Bjørn Vedel.

    In: Biostatistics, Vol. 8, No. 4, 2007, p. 784-799.

    Research output: Research - peer-reviewJournal article

  35. Published

    Biased visualization of hypoperfused tissue by computed tomography due to short imaging duration : improved classification by image down-sampling and vascular models. / Mikkelsen, Irene Klærke; Jones, P Simon; Ribe, Lars Riisgaard; Alawneh, Josef; Puig, Josep; Bekke, Susanne Lise; Tietze, Anna; Gillard, Jonathan H; Warburton, Elisabeth A; Pedraza, Salva; Baron, Jean-Claude; Østergaard, Leif; Mouridsen, Kim.

    In: European Radiology, Vol. 25, No. 7, 01.07.2015, p. 2080-8.

    Research output: Research - peer-reviewJournal article

  36. Published

    Billeddiagnostik af patofysiologien ved akut apopleksi. / Ashkanian, Mahmoud; Hjort, Niels; Sølling, Christine; Gyldensted, Carsten; Østergaard, Leif.

    In: Ugeskrift for Laeger, Vol. 169, No. 40, 2007, p. 3369-72.

    Research output: Research - peer-reviewJournal article

  37. Published

    Blood pressure reduction does not reduce perihematoma oxygenation : a CT perfusion study. / Kate, Mahesh P; Hansen, Mikkel B; Mouridsen, Kim; Østergaard, Leif; Choi, Victor; Gould, Bronwen E; McCourt, Rebecca; Hill, Michael D; Demchuk, Andrew M; Coutts, Shelagh B; Dowlatshahi, Dariush; Emery, Derek J; Buck, Brian H; Butcher, Kenneth S.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 34, No. 1, 03.01.2014, p. 81-86.

    Research output: Research - peer-reviewJournal article

  38. Published

    CBF and CBV measurements by USPIO bolus tracking: reproducibility and comparison with Gd-based values. / Simonsen, Claus Ziegler; Østergaard, Leif; Vestergaard-Poulsen, P; Røhl, L; Bjørnerud, A; Gyldensted, C.

    In: Journal of Magnetic Resonance Imaging, Vol. 9, No. 2, 1999, p. 342-7.

    Research output: Research - peer-reviewJournal article

  39. Published

    CT and MR perfusion can discriminate severe cerebral hypoperfusion from perfusion absence : evaluation of different commercial software packages by using digital phantoms. / Uwano, I; Kudo, Kohsuke; Sasaki, M; Christensen, Søren; Østergaard, Leif; Ogasawara, K; Ogawa, A.

    In: Neuroradiology, Vol. 54, No. 5, 01.05.2012, p. 467-74.

    Research output: Research - peer-reviewJournal article

  40. Published

    Capillary Transit Time Heterogeneity Is Associated with Modified Rankin Scale Score at Discharge in Patients with Bilateral High Grade Internal Carotid Artery Stenosis. / Mundiyanapurath, Sibu; Ringleb, Peter Arthur; Diatschuk, Sascha; Hansen, Mikkel Bo; Mouridsen, Kim; Østergaard, Leif; Wick, Wolfgang; Bendszus, Martin; Radbruch, Alexander.

    In: PloS one, Vol. 11, No. 6, 2016, p. e0158148.

    Research output: Research - peer-reviewJournal article

  41. Published
  42. Published
  43. Published
  44. Published
  45. Published
  46. Published
  47. Published

    Cerebral Hemodynamics in Human Acute Ischemic Stroke : A Study with Diffusion- and Perfusion-Weighted Magnetic Resonance Imaging and SPECT. / Liu, Y.; Karonen, J.O.; Vanninen, R.L.; Østergaard, Leif; Roivainen, R.; Nuutinen, J.; Perkiö, J.P.; Könönen, M.; Hämäläinen, A.; Vanninen, E.J.; Soimakallio, S.; Kuikka, J.T.; Aronen, H.J.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 20, No. 6, 2000, p. 910-920.

    Research output: Research - peer-reviewJournal article

  48. Published
  49. Published

    Cerebral blood flow measurements by magnetic resonance imaging bolus tracking: comparison with [(15)O]H2O positron emission tomography in humans. / Østergaard, Leif; Johannsen, P; Høst-Poulsen, P; Vestergaard-Poulsen, P; Asboe, H; Gee, A D; Hansen, Søren Baarsgaard; Cold, G E; Gjedde, A; Gyldensted, C.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 18, No. 9, 1998, p. 935-40.

    Research output: Research - peer-reviewJournal article

  50. Published

    Cerebral blood flow, blood volume and oxygen metabolism dynamics in human visual and motor cortex as measured by whole-brain multi-modal magnetic resonance imaging. / Donahue, Manus; Blicher, Jakob; Østergaard, Leif; Feinberg, David; MacIntosh, Bradley; Miller, Karla; Gunther, Matthias; Jezzard, Peter.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 29, No. 11, 2009, p. 1856-1866.

    Research output: Research - peer-reviewJournal article

  51. Published

    Cerebral hemodynamics in CADASIL before and after acetazolamide challenge assessed with MRI bolus tracking. / Chabriat, H; Pappata, S; Østergaard, Leif; Clark, C A; Pachot-Clouard, M; Vahedi, K; Jobert, A; Le Bihan, D; Bousser, M G.

    In: Stroke, Vol. 31, No. 8, 2000, p. 1904-12.

    Research output: Research - peer-reviewJournal article

  52. Published

    Cerebral metabolic response to low blood flow : possible role of cytochrome oxidase inhibition. / Gjedde, Albert; Johannsen, Peter; Cold, Georg; Østergaard, Leif.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 25, No. 9, 2005, p. 1183-96.

    Research output: Research - peer-reviewJournal article

  53. Published

    Cerebral small vessel disease: Capillary pathways to stroke and cognitive decline. / Østergaard, Leif; Engedal, Thorbjørn Søndergaard; Moreton, Fiona ; Hansen, Mikkel Bo; Wardlaw, Joanna M.; Dalkara, Turgay; Markus, Hugh S; Muir, Keith W.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 36, No. 2, 01.02.2016, p. 302-25.

    Research output: Research - peer-reviewJournal article

  54. Published

    Changes in regional brain volume three months after stroke. / Brodtmann, Amy; Pardoe, Heath ; Li, Qi; Lichter, Renee; Østergaard, Leif; Cumming, Toby.

    In: Journal of the neurological sciences, Vol. 322, No. 1-2, 15.11.2012, p. 122-8.

    Research output: Research - peer-reviewJournal article

  55. Published

    Characterizing physiological heterogeneity of infarction risk in acute human ischaemic stroke using MRI. / Wu, Ona; Christensen, Søren; Hjort, Niels; Dijkhuizen, RM; Kucinski, T; Fiehler, J; Thomalla, G; Rother, J; Østergaard, Leif.

    In: Brain, Vol. 129, No. 9, 2006, p. 2384–2393.

    Research output: Research - peer-reviewJournal article

  56. Published

    Combined diffusion and perfusion MRI with correlation to single-photon emission CT in acute ischemic stroke. Ischemic penumbra predicts infarct growth. / Karonen, J O; Vanninen, R L; Liu, Y; Østergaard, Leif; Kuikka, J T; Nuutinen, J; Vanninen, E J; Partanen, P L; Vainio, P A; Korhonen, K; Perkiö, J; Roivainen, R; Sivenius, J; Aronen, H J.

    In: Stroke, Vol. 30, No. 8, 1999, p. 1583-90.

    Research output: Research - peer-reviewJournal article

  57. Published

    Combined diffusion-weighted and perfusion-weighted flow heterogeneity magnetic resonance imaging in acute stroke. / Østergaard, Leif; Sorensen, A G; Chesler, D A; Weisskoff, R M; Koroshetz, W J; Wu, O; Gyldensted, C; Rosen, B R.

    In: Stroke, Vol. 31, No. 5, 2000, p. 1097-103.

    Research output: Research - peer-reviewJournal article

  58. Published

    Combined perfusion- and diffusion-weighted MR imaging in acute ischemic stroke during the 1st week : a longitudinal study. / Karonen, J O; Liu, Y; Vanninen, R L; Østergaard, Leif; Kaarina Partanen, P L; Vainio, P A; Vanninen, E J; Nuutinen, J; Roivainen, R; Soimakallio, S; Kuikka, J T; Aronen, H J.

    In: Radiology, Vol. 217, No. 3, 2000, p. 886-94.

    Research output: Research - peer-reviewJournal article

  59. Published

    Combretastatin A-4 phosphate affects tumor vessel volume and size distribution as assessed using MRI-based vessel size imaging. / Nielsen, Thomas; Bentzen, Lise; Pedersen, Michael Nygaard; Tramm, Trine; Rijken, Paul F J W; Bussink, Johan; Horsman, Michael R; Østergaard, Leif.

    In: Clinical Cancer Research, Vol. 18, No. 23, 2012, p. 6469-77.

    Research output: Research - peer-reviewJournal article

  60. Published

    Comparing anesthesia with isoflurane and fentanyl/fluanisone/midazolam in a rat model of cardiac arrest. / Secher, Niels; Malte, Christian Lind; Tønnesen, Else; Østergaard, Leif; Granfeldt, Asger.

    In: Journal of Applied Physiology, 2016, p. jap.00998.2015.

    Research output: Research - peer-reviewJournal article

  61. Published

    Comparison of 10 Perfusion MRI Parameters in 97 Sub 6 Hour Stroke Patients using Voxel based Receiver Operating Characteristics Analysis. / Christensen, Søren; Mouridsen, Kim; Wu, Ona; Hjort, Niels; Karstoft, Henrik; Thomalla, Götz; Röther, Joachim; Fiehler, Jens; Kucinski, Thomas; Østergaard, Leif.

    In: Stroke, Vol. 40, No. 6, 2009, p. 2055-61.

    Research output: Research - peer-reviewJournal article

  62. Published

    Comparison of gradient- and spin-echo imaging: CBF, CBV, and MTT measurements by bolus tracking. / Simonsen, Claus Ziegler; Østergaard, Leif; Smith, D F; Vestergaard-Poulsen, P; Gyldensted, C.

    In: Journal of Magnetic Resonance Imaging, Vol. 12, No. 3, 2000, p. 411-6.

    Research output: Research - peer-reviewJournal article

  63. Published

    Concrete spatial language : see what I mean? / Wallentin, Mikkel; Østergaard, Svend; Lund, Torben Ellegaard; Østergaard, Leif; Roepstorff, Andreas.

    In: Brain and Language, Vol. 92, No. 3, 2005, p. 221-33.

    Research output: Research - peer-reviewJournal article

  64. Published

    Contrast agents in functional MR imaging. / Sorensen, A G; Tievsky, A L; Østergaard, Leif; Weisskoff, R M; Rosen, B R.

    In: Journal of Magnetic Resonance Imaging, Vol. 7, No. 1, 1997, p. 47-55.

    Research output: Research - peer-reviewJournal article

  65. Published
  66. Published

    Correlations between Stroop task performance and white matter lesion measures in late-onset major depression. / Dalby, Rikke Beese; Frandsen, Jesper; Mallar, Chakravarty; Ahdidan, Jamila; Sørensen, Leif; Rosenberg, Raben; Østergaard, Leif; Videbech, Poul.

    In: Psychiatry Research, Vol. 202, No. 2, 2012, p. 142-149.

    Research output: Research - peer-reviewJournal article

  67. Published
  68. Published

    Cortical volumes and atrophy rates in FTD-3 CHMP2B mutation carriers and related non-carriers. / Fristed Eskildsen, Simon; Riis Østergaard, Lasse; Rodell, Anders; Østergaard, Leif; Nielsen, Jørgen Erik; Isaacs, Adrian M.; Johannsen, Peter.

    In: NeuroImage, Vol. 45, No. 3, 2009, p. 713-21.

    Research output: Research - peer-reviewJournal article

  69. Published

    Depression severity is correlated to the integrity of white matter fiber tracts in late-onset major depression. / Dalby, Rikke Beese; Frandsen, Jesper; Mallar, Chakravarty; Ahdidan, Jamila; Sørensen, Leif; Rosenberg, Raben; Videbech, Poul; Østergaard, Leif.

    In: Psychiatry Research, Vol. 184, No. 1, 30.10.2010, p. 38-48.

    Research output: Research - peer-reviewJournal article

  70. Published
  71. Published

    Diffusion and perfusion MR imaging in acute ischemic stroke : a comparison to SPECT. / Karonen, J O; Østergaard, Leif; Vainio, P; Partanen, K; Vanninen, R; Vanninen, E; Korhonen, K; Haapamäki, S; Liu, Y; Roivainen, R; Onatsu, J; Nuutinen, J; Könönen, M; Sivenius, J; Kuikka, J; Aronen, H J.

    In: Computer Methods and Programs in Biomedicine, Vol. 66, No. 1, 2001, p. 125-8.

    Research output: Research - peer-reviewJournal article

  72. Published

    Distinct neural responses to chord violations : a multiple source analysis study. / Garza Villarreal, Eduardo A; Brattico, Elvira; Leino, Sakari; Ostergaard, Leif; Vuust, Peter.

    In: Brain Research, Vol. 1389, 2011, p. 103-14.

    Research output: Research - peer-reviewJournal article

  73. Published
  74. Published

    Does b1000-b0 Mismatch Challenge Diffusion-Weighted Imaging-Fluid Attenuated Inversion Recovery Mismatch in Stroke? / Geraldo, Ana Filipa; Berner, Lise-Prune; Haesebaert, Julie; Chabrol, Aurélie; Cho, Tae-Hee; Derex, Laurent; Hermier, Marc; Louis-Tisserand, Guy; Chamard, Leila; Klaerke Mikkelsen, Irene; Ribe, Lars; Østergaard, Leif; Hjort, Niels; Pedraza, Salvador; Thomalla, Götz; Baron, Jean-Claude; Nighoghossian, Norbert; Berthèzene, Yves.

    In: Stroke; a journal of cerebral circulation, 03.2016.

    Research output: Research - peer-reviewJournal article

  75. Published

    Dose optimization for using the contrast agent gadofosveset in magnetic resonance imaging (MRI) of domestic pig brain. / Poulsen, Erik Søndergaard; Alstrup, Aage Kristian Olsen; Zeidler, Dora; Hjort, Niels; Østergaard, Leif.

    In: Scandinavian Journal of Laboratory Animal Science, Vol. 4, 2013, p. 1-9.

    Research output: Research - peer-reviewJournal article

  76. Published

    Dynamic changes in corticospinal tracts after stroke detected by fibretracking. / Møller, Mette; Frandsen, Jesper; Andersen, Grethe; Gjedde, Albert; Vestergaard-Poulsen, Peter; Østergaard, Leif.

    In: Journal of Neurology, Neurosurgery and Psychiatry, Vol. 78, No. 6, 2007, p. 587-92.

    Research output: Research - peer-reviewJournal article

  77. Published

    Early Blood Brain Barrier Changes in Acute Ischemic Stroke : A Sequential MRI Study. / Giraud, Marc; Cho, Tae-Hee; Nighoghossian, Norbert; Maucort-Boulch, Delphine; Deiana, Gianluca; Østergaard, Leif; Baron, Jean-Claude; Fiehler, Jens; Pedraza, Salvador; Derex, Laurent; Berthezène, Yves.

    In: Journal of Neuroimaging, Vol. 25, No. 6, 02.12.2015, p. 959-63.

    Research output: Research - peer-reviewJournal article

  78. Published

    Early changes measured by magnetic resonance imaging in cerebral blood flow, blood volume, and blood-brain barrier permeability following dexamethasone treatment in patients with brain tumors. / Østergaard, Leif; Hochberg, F H; Rabinov, J D; Sorensen, A G; Lev, M; Kim, L; Weisskoff, R M; Gonzalez, R G; Gyldensted, C; Rosen, B R.

    In: Journal of Neurosurgery, Vol. 90, No. 2, 1999, p. 300-5.

    Research output: Research - peer-reviewJournal article

  79. Published

    Effect of Impermeable Interfaceson Apparent Diffusion Coefficient in Heterogeneous Media. / Frøhlich, Astrid From; Østergaard, Leif; Kiselev, Valerij G.

    In: Applied Magnetic Resonance, Vol. 29, 2005, p. 123-137.

    Research output: Research - peer-reviewJournal article

  80. Published

    Effect of Impermeable boundaries on Diffusion-Attenuated MR Signal. / Frøhlich, Astrid From; Østergaard, Leif; Kiselev, Valerij G.

    In: Journal of Magnetic Resonance, Vol. 179, 2006, p. 223-233.

    Research output: Research - peer-reviewJournal article

  81. Published

    Effect of electrical forepaw stimulation on capillary transit-time heterogeneity (CTH). / Gutiérrez-Jiménez, Eugenio; Cai, Changsi; Mikkelsen, Irene Klærke; Rasmussen, Peter Mondrup; Angleys, Hugo; Merrild, Mads; Mouridsen, Kim; Jespersen, Sune Nørhøj; Lee, Jonghwan; Iversen, Nina Kerting; Sakadzic, Sava; Østergaard, Leif.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 36, No. 12, 01.12.2016, p. 2072-2086.

    Research output: Research - peer-reviewJournal article

  82. Published
  83. Published
  84. Published

    Effects of tracer arrival time on flow estimates in MR perfusion-weighted imaging. / Wu, Ona; Østergaard, Leif; Koroshetz, Walter J; Schwamm, Lee H; O'Donnell, Joanie; Schaefer, Pamela W; Rosen, Bruce R; Weisskoff, Robert M; Sorensen, A Gregory.

    In: Magnetic Resonance in Medicine, Vol. 50, No. 4, 2003, p. 856-64.

    Research output: Research - peer-reviewJournal article

  85. Published

    Elevated T2-values in MRI of stroke patients shortly after symptom onset do not predict irreversible tissue infarction. / Siemonsen, Susanne ; Löbel, Ulricke; Sedlacik, Jan; Forkert, Nils D.; Mouridsen, Kim; Østergaard, Leif; Thomalla, Goetz; Fiehler, Jens.

    In: Brain, Vol. 135, No. 6, 15.03.2012, p. 1981-89.

    Research output: Research - peer-reviewJournal article

  86. Published

    Evaluation of Early Reperfusion Criteria in Acute Ischemic Stroke. / Ozenne, Brice; Cho, Tae-Hee; Mikkelsen, Irene Klaerke; Hermier, Marc; Ribe, Lars; Thomalla, Götz; Pedraza, Salvador; Baron, Jean-Claude; Roy, Pascal; Berthezène, Yves; Nighoghossian, Norbert; Østergaard, Leif; Maucort-Boulch, Delphine.

    In: Journal of Neuroimaging, Vol. 25, No. 6, 01.11.2015, p. 951-8.

    Research output: Research - peer-reviewJournal article

  87. Published

    Evaluation of four postprocessing methods for determination of cerebral blood volume and mean transit time by dynamic susceptibility contrast imaging. / Perkiö, Jussi; Aronen, Hannu J; Kangasmäki, Aki; Liu, Yawu; Karonen, Jari; Savolainen, Sauli; Østergaard, Leif.

    In: Magnetic Resonance in Medicine, Vol. 47, No. 5, 2002, p. 973-81.

    Research output: Research - peer-reviewJournal article

  88. Published

    FDOPA metabolism in the adult porcine brain: influence of tracer circulation time and VOI selection on estimates of striatal DOPA decarboxylation. / Danielsen, E H; Smith, D F; Andersen, Flemming; Gee, A D; Bender, D; Hansen, Søren Baarsgaard; Hermansen, F; Østergaard, L; Cumming, P; Gjedde, A.

    In: Journal of Neuroscience Methods, Vol. 111, No. 2, 2001, p. 157-68.

    Research output: Research - peer-reviewJournal article

  89. Published

    Feasibility and logistics of MRI before thrombolytic treatment. / Sølling, C; Ashkanian, M; Hjort, N; Gyldensted, C; Andersen, Grethe; Østergaard, Leif.

    In: Acta Neurologica Scandinavica, Vol. 120, No. 3, 2009, p. 143-9.

    Research output: Research - peer-reviewJournal article

  90. Published

    Final infarct size after acute stroke : prediction with flow heterogeneity. / Simonsen, Claus Z; Røhl, Lisbeth; Vestergaard-Poulsen, Peter; Gyldensted, Carsten; Andersen, Grethe; Østergaard, Leif.

    In: Radiology, Vol. 225, No. 1, 2002, p. 269-75.

    Research output: Research - peer-reviewJournal article

  91. Published

    GABA Levels Are Decreased After Stroke and GABA Changes During Rehabilitation Correlate With Motor Improvement. / Blicher, Jakob; Near, Jamie; Næss-Schmidt, Erhard; Stagg, Charlotte J; Johansen-Berg, Heidi; Nielsen, Jørgen Feldbæk; Østergaard, Leif; Ho, Yi Ching Lynn.

    In: Neurorehabilitation and Neural Repair, Vol. 29, No. 3, 2015, p. 278-86.

    Research output: Research - peer-reviewJournal article

  92. Published

    High resolution measurement of cerebral blood flow using intravascular tracer bolus passages. Part I: Mathematical approach and statistical analysis. / Østergaard, Leif; Weisskoff, R M; Chesler, D A; Gyldensted, C; Rosen, B R.

    In: Magnetic Resonance in Medicine, Vol. 36, No. 5, 1996, p. 715-25.

    Research output: Research - peer-reviewJournal article

  93. Published

    High resolution measurement of cerebral blood flow using intravascular tracer bolus passages. Part II: Experimental comparison and preliminary results. / Østergaard, Leif; Sorensen, A G; Kwong, K K; Weisskoff, R M; Gyldensted, C; Rosen, B R.

    In: Magnetic Resonance in Medicine, Vol. 36, No. 5, 1996, p. 726-36.

    Research output: Research - peer-reviewJournal article

  94. Published

    How reliable is perfusion MR in acute stroke? : Validation and determination of the penumbra threshold against quantitative PET. / Takasawa, Masashi; Jones, P. Simon; Guadagno, Joseph V.; Christensen, Søren; Fryer, Tim D.; Harding, Sally; Gillard, Jonathan H.; Williams, Guy B.; Aigbirhio, Franklin I.; Warburton, Elizabeth A.; Østergaard, Leif; Baron, Jean-Claude.

    In: Stroke, Vol. 39, No. 3, 2008, p. 870-7.

    Research output: Research - peer-reviewJournal article

  95. Published

    Hyperacute stroke: simultaneous measurement of relative cerebral blood volume, relative cerebral blood flow, and mean tissue transit time. / Sorensen, A G; Copen, W A; Østergaard, Leif; Buonanno, F S; Gonzalez, R G; Rordorf, G; Rosen, B R; Schwamm, L H; Weisskoff, R M; Koroshetz, W J.

    In: Radiology, Vol. 210, No. 2, 1999, p. 519-27.

    Research output: Research - peer-reviewJournal article

  96. E-pub ahead of print
  97. Published

    Improvement of brain tissue oxygenation by inhalation of carbogen. / Ashkanian, M; Borghammer, Per; Gjedde, A; Østergaard, Leif; Vafaee, M.

    In: Neuroscience, Vol. 156, No. 4, 2008, p. 932-938.

    Research output: Research - peer-reviewJournal article

  98. Published
  99. Published
  100. Published

    Infarct prediction and treatment assessment with MRI-based algorithms in experimental stroke models. / Wu, Ona; Sumii, T; Asahi, M; Sasamata, M; Østergaard, Leif; Rosen, BR; Lo, EH; Dijkhuizen, RM.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 27, No. 1, 2007, p. 196-204.

    Research output: Research - peer-reviewJournal article

  101. Published

    Infarction of ‘non-core–non-penumbral’ tissue after stroke: Multivariate modeling of clinical impact. / Alawneh, Josef A.; Jones, Peter Simon; Mikkelsen, Irene Klærke; Cho, Tea-Hee; Siemonsen, Susanne; Mouridsen, Kim; Ribe, Lars Riisgaard; Morris, Rhiannon S.; Hjort, Niels; Antoun, Nagui; Gillard, Jonathan H.; Fiehler, Jens; Nighoghossian, Norbert; Warburton, Elizabeth A.; Østergaard, Leif; Baron, Jean-Claude.

    In: Brain, Vol. 134, No. 6, 28.05.2011, p. 1765-1776.

    Research output: Research - peer-reviewJournal article

  102. Published

    Inferring origin of vascular supply from tracer arrival timing patterns using bolus tracking MRI. / Christensen, Søren; Calamante, Fernando; Hjort, Niels; Wu, Ona; Blankholm, Anne Dorte; Desmond, Patricia; Davis, Steven; Østergaard, Leif.

    In: Journal of Magnetic Resonance Imaging, Vol. 27, No. 6, 2008, p. 1371-81.

    Research output: Research - peer-reviewJournal article

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