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Wu, O., Østergaard, L., Koroshetz, W. J., Schwamm, L. H., ODonnell, J., Schaefer, P. W., Rosen, B. R., Weisskoff, R. M. & Sorensen, A. G. (2003). Tracer arrival timing insensitive technique for estimating flow in MR perfusion-weighted imaging using singular value decomposition with a block-circulant deconvolution matrix. Magnetic Resonance in Medicine, 50(1), 164-174. https://doi.org/10.1002/mrm.10522
Perkiö, J., Aronen, H. J., Kangasmäki, A., Liu, Y., Karonen, J., Savolainen, S. & Østergaard, L. (2002). Evaluation of four postprocessing methods for determination of cerebral blood volume and mean transit time by dynamic susceptibility contrast imaging. Magnetic Resonance in Medicine, 47(5), 973-81. https://doi.org/10.1002/mrm.10126
Yamada, K., Gonzalez, R. G., Østergaard, L., Komili, S., Weisskoff, R. M., Rosen, B. R., Koroshetz, W. J., Nishimura, T. & Sorensen, A. G. (2002). Iron-induced susceptibility effect at the globus pallidus causes underestimation of flow and volume on dynamic susceptibility contrast-enhanced MR perfusion images. American Journal of Neuroradiology, 23(6), 1022-9.
Yamada, K., Wu, O., Gonzalez, R. G., Bakker, D., Østergaard, L., Copen, W. A., Weisskoff, R. M., Rosen, B. R., Yagi, K., Nishimura, T. & Sorensen, A. G. (2002). Magnetic resonance perfusion-weighted imaging of acute cerebral infarction: effect of the calculation methods and underlying vasculopathy. Stroke; a journal of cerebral circulation, 33(1), 87-94. https://doi.org/10.1161/hs0102.101893
Aronen, H. J., Perkiö, J., Karonen, J. O., Vanninen, R. L., Østergaard, L., Liu, Y., Könönen, M., Vanninen, E. J., Soimakallio, S. & Kuikka, J. T. (2002). Perfusion-weighted MRI in human acute ischemic stroke: a comparison with the progression of the infarct on diffusion-weighted images. Academic Radiology, 9(Suppl 1), S160-4. https://doi.org/10.1016/S1076-6332(03)80427-0
Karonen, J. O., Østergaard, L., 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. (2001). Diffusion and perfusion MR imaging in acute ischemic stroke: a comparison to SPECT. Computer Methods and Programs in Biomedicine, 66(1), 125-8. https://doi.org/10.1016/S0169-2607(01)00146-8
Wu, O., Koroshetz, W. J., Østergaard, L., Buonanno, F. S., Copen, W. A., Gonzalez, R. G., Rordorf, G., Rosen, B. R., Schwamm, L. H., Weisskoff, R. M. & Sorensen, A. G. (2001). Predicting tissue outcome in acute human cerebral ischemia using combined diffusion- and perfusion-weighted MR imaging. Stroke; a journal of cerebral circulation, 32(4), 933-42. https://doi.org/10.1161/01.STR.32.4.933
Lin, W., Celik, A., Derdeyn, C., An, H., Lee, Y., Videen, T., Østergaard, L. & Powers, W. J. (2001). Quantitative measurements of cerebral blood flow in patients with unilateral carotid artery occlusion: a PET and MR study. Journal of Magnetic Resonance Imaging, 14(6), 659-67. https://doi.org/10.1002/jmri.10021
Wirestam, R., Andersson, L., Østergaard, L., Bolling, M., Aunola, J., Lindgren, A., Geijer, B., Holtås, S. & Ståhlberg, F. (2000). Assessment of regional cerebral blood flow by dynamic susceptibility contrast MRI using different deconvolution techniques. Magnetic Resonance in Medicine, 43(5), 691-700. https://doi.org/10.1002/(SICI)1522-2594(200005)43:5<691::AID-MRM11>3.0.CO;2-B
Chabriat, H., Pappata, S., Østergaard, L., Clark, C. A., Pachot-Clouard, M., Vahedi, K., Jobert, A., Le Bihan, D. & Bousser, M. G. (2000). Cerebral hemodynamics in CADASIL before and after acetazolamide challenge assessed with MRI bolus tracking. Stroke, 31(8), 1904-12. https://doi.org/10.1161/01.STR.31.8.1904
Liu, Y., Karonen, J. O., Vanninen, R. L., Østergaard, L., Roivainen, R., Nuutinen, J., Perkiö, J. P., Könönen, M., Hämäläinen, A., Vanninen, E. J., Soimakallio, S., Kuikka, J. T. & Aronen, H. J. (2000). Cerebral Hemodynamics in Human Acute Ischemic Stroke: A Study with Diffusion- and Perfusion-Weighted Magnetic Resonance Imaging and SPECT. Journal of Cerebral Blood Flow and Metabolism, 20(6), 910-920. https://doi.org/10.1097/00004647-200006000-00003
Karonen, J. O., Liu, Y., Vanninen, R. L., Østergaard, L., Kaarina Partanen, P. L., Vainio, P. A., Vanninen, E. J., Nuutinen, J., Roivainen, R., Soimakallio, S., Kuikka, J. T. & Aronen, H. J. (2000). Combined perfusion- and diffusion-weighted MR imaging in acute ischemic stroke during the 1st week: a longitudinal study. Radiology, 217(3), 886-94. https://doi.org/10.1148/radiology.217.3.r00dc02886
Perkiö, J., Soinne, L., Østergaard, L., Tatlisumak, T., Kangsmäki, A., Helenius, J., Martinkauppi, S., Salonen, O., Savolainen, S., Kaste, M. & Aronen, H. J. (2000). Dynamic MR Bolus Tracking in Hyperacute Stroke: Comparison with Diffusion Weighted MR Imaging. In Proc. Intl. Soc. Mag. Reson. Med. 8 (pp. 450-450)
Benner, T., Tombach, B., Synnott, J. P., Schuierer, G., Reimer, P., Geens, V., Østergaard, L. & Sorensen, A. G. (2000). Human Cerebral Blood Flow Maps Improve with Higher Concentration of Contrast Agent. In ISMRM 8th Scientific Meeting & Exhibition - Proceedings
Li, T.-Q., Chen, Z. G., Østergaard, L., Hindmarsh, T. & Moseley, M. E. (2000). Quantification of Cerebral Blood Flow by Using Bolus Tracking and Artery Spin Tagging Methods. Magnetic Resonance Imaging, 18(5), 503-512. https://doi.org/10.1016/S0730-725X(00)00137-5
Lythgoe, D. J., Østergaard, L., William, S. C., Cluckie, A., Buxton-Thomas, M., Simmons, A. & Markus, H. S. (2000). Quantitative perfusion imaging in carotid artery stenosis using dynamic susceptibility contrast-enhanced magnetic resonance imaging. Magnetic Resonance Imaging, 18(1), 1-11. https://doi.org/10.1016/S0730-725X(99)00112-5
Markus, H. S., Lythgoe, D., Østergaard, L., O'Sullivan, M. & Williams, S. C. R. (2000). Reduced cerebral blood flow in white matter in ischaemic leukoaraiosis demonstrated using quantitative exogenous contrast based perfusion MRI. Journal of Neurology, Neurosurgery & Psychiatry, 69(1), 48-53. https://doi.org/10.1136/jnnp.69.1.48
Wirestam, R., Ryding, E., Lindgren, A., Geijer, B., Østergaard, L., Andersson, L., Holtås, S. & Ståhlberg, F. (2000). Regional cerebral blood flow distributions in normal volunteers: dynamic susceptibility contrast MRI compared with 99mTc-HMPAO SPECT. Journal of Computer Assisted Tomography, 24(4), 526-30.
Danielsen, E. H., Cumming, P., 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, O. L., Pedersen, E. B., Poulsen, P. H., Rodell, A. B. ... Møller, A. (2000). The DaNeX Study of Embryonic Mesencephalic Dopaminergic Tissue Grafted to a Minipig model of Parkinson's disease: Preliminary Findings of Effect of MPTP-Poisoning on Striatal Dopaminergic Markers. Cell Transplantation, 9(2), 247-259. https://doi.org/10.1177/096368970000900210
Zelaya, F., Flood, N., Chalk, J. B., Wang, D., Doddrell, D. M., Strugnell, W., Benson, M., Østergaard, L., Semple, J. & Eagle, S. (1999). An evaluation of the time dependence of the anisotropy of the water diffusion tensor in acute human ischemia. Magnetic Resonance Imaging, 17(3), 331-48. https://doi.org/10.1016/S0730-725X(98)00192-1
Karonen, J. O., Vanninen, R. L., Liu, Y., Østergaard, L., 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. (1999). Combined diffusion and perfusion MRI with correlation to single-photon emission CT in acute ischemic stroke. Ischemic penumbra predicts infarct growth. Stroke, 30(8), 1583-90. https://doi.org/10.1161/01.STR.30.8.1583
Østergaard, L., Hochberg, F. H., Rabinov, J. D., Sorensen, A. G., Lev, M., Kim, L., Weisskoff, R. M., Gonzalez, R. G., Gyldensted, C. & Rosen, B. R. (1999). 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. Journal of Neurosurgery, 90(2), 300-5.
Sorensen, A. G., Copen, W. A., Østergaard, L., Buonanno, F. S., Gonzalez, R. G., Rordorf, G., Rosen, B. R., Schwamm, L. H., Weisskoff, R. M. & Koroshetz, W. J. (1999). Hyperacute stroke: simultaneous measurement of relative cerebral blood volume, relative cerebral blood flow, and mean tissue transit time. Radiology, 210(2), 519-27. https://doi.org/10.1148/radiology.210.2.r99fe06519
Østergaard, L., Chesler, D. A., Weisskoff, R. M., Sorensen, A. G. & Rosen, B. R. (1999). Modeling cerebral blood flow and flow heterogeneity from magnetic resonance residue data. Journal of Cerebral Blood Flow and Metabolism, 19(6), 690-9. https://doi.org/10.1097/00004647-199906000-00013
Gjedde, A., Poulsen, P. H. & Østergaard, L. (1999). On the oxygenation of hemoglobin in the human brain. In A. Eke & D. T. Delpy (Eds.), Oxygen Transport to Tissue XXI (Vol. 471, pp. 67-81). Springer Publishing Company.
Sanchez del Rio, M., Bakker, D., Wu, O., Agosti, R., Mitsikostas, D. D., Østergaard, L., Wells, W. A., Rosen, B. R., Sorensen, G., Moskowitz, M. A. & Cutrer, F. M. (1999). Perfusion weighted imaging during migraine: spontaneous visual aura and headache. Cephalalgia, 19(8), 701-7.
Cutrer, F. M., Sorensen, A. G., Weisskoff, R. M., Østergaard, L., Sanchez del Rio, M., Lee, E. J., Rosen, B. R. & Moskowitz, M. A. (1998). Perfusion-weighted imaging defects during spontaneous migrainous aura. Annals of Neurology, 43(1), 25-31. https://doi.org/10.1002/ana.410430108
Sorensen, A. G., Tievsky, A. L., Østergaard, L., Weisskoff, R. M. & Rosen, B. R. (1997). Contrast agents in functional MR imaging. Journal of Magnetic Resonance Imaging, 7(1), 47-55.
Kwong, K. K., Chesler, D. A., Weisskoff, R. M., Donahue, K. M., Davis, T. L., Østergaard, L., Campbell, T. A. & Rosen, B. R. (1995). MR perfusion studies with T1-weighted echo planar imaging. Magnetic Resonance in Medicine, 34(6), 878-87. https://doi.org/Harvard-MIT Division of Health Sciences & Technology