Leif Østergaard

  1. 2000
  2. 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

  3. Published
  4. 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

  5. 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

  6. 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

  7. 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

  8. Published

    Comparison of Gd-DTPA BMA and NC100150 Enhancement Patterns in C3H Mammary Carcinoma Bearing Mice. / Østergaard, Leif; Vestergaard-Poulsen, Peter; Bentzen, Lise Nørgaard; Horsman, M.R.; Overgaard, Jens; Bjørnerud, A.; Briley-Sæbø, K.; Gyldensted, C.

    Proc. Intl. Sot. Mag. Reson. Med. 8. 2000. p. 2019-2019.

    Research output: ResearchArticle in proceedings

  9. 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

  10. Published

    Determination of Cerebral Blood Volume and Mean Transit Time by Dynamic Contrast Enhanced MR Imaging in Patients with Acute Stroke : A Comparison of Four Post Processing Methods. / Perkiö, J.; Aronen, H.J.; Karonen, J.; Liu, Y.; Savolainen, S.; Østergaard, Leif.

    Proc. Intl. Sot. Mag. Reson. Med. 8. 2000. p. 527-527.

    Research output: ResearchArticle in proceedings

  11. Published

    Dynamic MR Bolus Tracking in Hyperacute Stroke : Comparison with Diffusion Weighted MR Imaging. / Perkiö, J.; Soinne, L.; Østergaard, Leif; Tatlisumak, T.; Kangsmäki, A.; Helenius, J.; Martinkauppi, S.; Salonen, O.; Savolainen, S.; Kaste, M.; Aronen, H.J.

    Proc. Intl. Soc. Mag. Reson. Med. 8. 2000. p. 450-450.

    Research output: ResearchArticle in proceedings

  12. Published

    Human Cerebral Blood Flow Maps Improve with Higher Concentration of Contrast Agent. / Benner, T.; Tombach, B.; Synnott, J.P.; Schuierer, G.; Reimer, P.; Geens, V.; Østergaard, Leif; Sorensen, A.G.

    ISMRM 8th Scientific Meeting & Exhibition - Proceedings. 2000.

    Research output: Research - peer-reviewArticle in proceedings

  13. Published

    MR Residue Detection: Modeling Cerebral Blood Flow and Flow Heterogeneity : With Special Reference to Acute Stroke. / Østergaard, Leif.

    Aarhus : Faculty of Health Sciences, Aarhus University, 2000. 30 p.

    Research output: ResearchDoctoral thesis

  14. Published

    Methodological Aspects of Cerebral Blood Flow Measurements : With Special Reference to Monitoring Anti-Edema Drug Action in Brain Tumor Patients. / Østergaard, Leif.

    Aarhus : Faculty of Health Sciences, Aarhus University, 2000. 24 p.

    Research output: ResearchPh.D. thesis

  15. Published

    NC100150 Enhanced Imaging Offers the Possibility to Monitor Pharmacological Modification of Tumor Blood Flow and Blood Volume in Experimental Tumors in Mice. / Bentzen, Lise Nørgaard; Vestergaard-Poulsen, Peter; Horsman, M.R.; Overgaard, Jens; Bjørnerud, A.; Briley-Sæbø, K.; Gyldensted, C.; Østergaard, Leif.

    ISMRM 8th Scientific Meeting & Exhibition - Proceedings. 2000. 2030.

    Research output: Research - peer-reviewArticle in proceedings

  16. Published

    Pulmonary function affects the quantification of rCBF by non-invasive xenon methods. / von Oettingen, G; Bergholt, B; Rasmussen, M; Østergaard, Leif; Astrup, J.

    In: Journal of Neuroscience Methods, Vol. 95, No. 2, 2000, p. 159-69.

    Research output: Research - peer-reviewJournal article

  17. Published

    Quantification of Cerebral Blood Flow by Using Bolus Tracking and Artery Spin Tagging Methods. / Li, T-Q.; Chen, Z.G.; Østergaard, Leif; Hindmarsh, T.; Moseley, M.E.

    In: Magnetic Resonance Imaging, Vol. 18, No. 5, 2000, p. 503-512.

    Research output: Research - peer-reviewJournal article

  18. Published

    Quantitative perfusion imaging in carotid artery stenosis using dynamic susceptibility contrast-enhanced magnetic resonance imaging. / Lythgoe, D J; Østergaard, Leif; William, S C; Cluckie, A; Buxton-Thomas, M; Simmons, A; Markus, H S.

    In: Magnetic Resonance Imaging, Vol. 18, No. 1, 2000, p. 1-11.

    Research output: Research - peer-reviewJournal article

  19. Published

    Reduced cerebral blood flow in white matter in ischaemic leukoaraiosis demonstrated using quantitative exogenous contrast based perfusion MRI. / Markus, H.S.; Lythgoe, D.; Østergaard, Leif; O'Sullivan, M.; Williams, S.C.R.

    In: Journal of Neurology, Neurosurgery and Psychiatry, Vol. 69, No. 1, 2000, p. 48-53.

    Research output: Research - peer-reviewJournal article

  20. Published

    Regional cerebral blood flow distributions in normal volunteers: dynamic susceptibility contrast MRI compared with 99mTc-HMPAO SPECT. / Wirestam, R; Ryding, E; Lindgren, A; Geijer, B; Østergaard, Leif; Andersson, L; Holtås, S; Ståhlberg, F.

    In: Journal of Computer Assisted Tomography, Vol. 24, No. 4, 2000, p. 526-30.

    Research output: Research - peer-reviewJournal article

  21. Published
  22. Published

    The DaNeX Study of Fetal Embryonic Mesencephalic Dopaminergic Tissue Grafted to a Minipig model of Parkinson's disease : Preliminary Findings of Effect of MPTP-Poisoning on Striatal Dopaminergic Markers. / Danielsen, Erik Hvid; Cumming, Paul; Andersen, F.; Bender, D.; Brevig, T.; Falborg, L.; Gee, A.; Gillings, N.M.; Hansen, S.B.; Hermansen, F.; Johansen, J.; Johansen, T.E.; Dahl-Jørgensen, A.; Jørgensen, H.A.; Meyer, M.; Munk, Ole Lajord; Pedersen, E.B.; Poulsen, P.H.; Rodell, A.B.; Sakoh, M.; Simonsen, Claus Ziegler; Smith, Donald F.; Sørensen, J.C.; Østergaard, Leif; Zimmer, J.; Gjedde, Albert; Møller, Arne.

    In: Cell Transplantation, Vol. 9, No. 2, 2000, p. 247-259.

    Research output: Research - peer-reviewJournal article

  23. Published

    The influence of the input function on quantitative rCBF by the Xe/CT method. / Oettingen, Gorm von; Bergholt, Bo; Østergaard, Leif; Rasmussen, Mads; Gyldensted, Carsten; Astrup, Jens.

    In: Keio Journal of Medicine, Vol. 49, No. Suppl 1, 2000, p. 11-15.

    Research output: Research - peer-reviewConference article

  24. Published

    Viability Thresholds of the Penumbra of Acute Human Ischemic Stroke Defined from rCBF and rCBV. / Røhl, Lisbeth; Østergaard, Leif; Simonsen, Claus Ziegler; Vestergaard-Poulsen, Peter; Andersen, Grethe; Le Bihan, D.; Gyldensted, Carsten.

    In: Proc ISMRM, 2000, p. 452-452.

    Research output: Research - peer-reviewJournal article

  25. Published

    Xenon CT cerebral blood flow in patients with head injury: influence of pulmonary trauma on the input function. / von Oettingen, G; Bergholt, Bo; Østergaard, Leif; Jensen, Lars Christian; Gyldensted, C; Astrup, Jens.

    In: Neuroradiology, Vol. 42, No. 3, 2000, p. 168-73.

    Research output: Research - peer-reviewJournal article

  26. 1999
  27. 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

  28. 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

  29. 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

  30. 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

  31. 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

  32. Published

    Modeling cerebral blood flow and flow heterogeneity from magnetic resonance residue data. / Østergaard, Leif; Chesler, D A; Weisskoff, R M; Sorensen, A G; Rosen, B R.

    In: Journal of Cerebral Blood Flow and Metabolism, Vol. 19, No. 6, 1999, p. 690-9.

    Research output: Research - peer-reviewJournal article

  33. Published

    NC100150-enhanced 3D-SPGR MR angiography of the common carotid artery in a pig vascular stenosis model : Quantification of stenosis and dose optimization. / Røhl, L; Østergaard, Leif; Simonsen, Claus Ziegler; Vestergaard-Poulsen, P; Sørensen, L; Bjørnerud, A; Saebø, K B; Gyldensted, C.

    In: Acta Radiologica, Vol. 40, No. 3, 1999, p. 282-90.

    Research output: Research - peer-reviewJournal article

  34. Published

    On the oxygenation of hemoglobin in the human brain. / Gjedde, A; Poulsen, P H; Østergaard, Leif.

    Oxygen Transport to Tissue XXI. ed. / Andras Eke; David T Delpy. Vol. 471 Springer Publishing Company, 1999. p. 67-81.

    Research output: ResearchBook chapter

  35. Published

    Perfusion weighted imaging during migraine : spontaneous visual aura and headache. / Sanchez del Rio, M; Bakker, D; Wu, O; Agosti, R; Mitsikostas, D D; Østergaard, Leif; Wells, W A; Rosen, B R; Sorensen, G; Moskowitz, M A; Cutrer, F M.

    In: Cephalalgia, Vol. 19, No. 8, 1999, p. 701-7.

    Research output: Research - peer-reviewJournal article

  36. 1998
  37. 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

  38. 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

  39. Published

    Perfusion-weighted imaging defects during spontaneous migrainous aura. / Cutrer, F M; Sorensen, A G; Weisskoff, R M; Østergaard, Leif; Sanchez del Rio, M; Lee, E J; Rosen, B R; Moskowitz, M A.

    In: Annals of Neurology, Vol. 43, No. 1, 1998, p. 25-31.

    Research output: Research - peer-reviewJournal article

  40. 1997
  41. 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

  42. Published
  43. 1996
  44. 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

  45. 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

  46. 1995
  47. Published

    MR perfusion studies with T1-weighted echo planar imaging. / Kwong, K K; Chesler, D A; Weisskoff, R M; Donahue, K M; Davis, T L; Østergaard, Leif; Campbell, T A; Rosen, B R.

    In: Magnetic Resonance in Medicine, Vol. 34, No. 6, 1995, p. 878-87.

    Research output: Research - peer-reviewJournal article

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