S
Seiji Ogawa
Researcher at Alcatel-Lucent
Publications - 78
Citations - 20493
Seiji Ogawa is an academic researcher from Alcatel-Lucent. The author has contributed to research in topics: Functional magnetic resonance imaging & Magnetic resonance imaging. The author has an hindex of 42, co-authored 78 publications receiving 19754 citations. Previous affiliations of Seiji Ogawa include Bell Labs & University of Bremen.
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Brain magnetic resonance imaging with contrast dependent on blood oxygenation
TL;DR: In this paper, the authors demonstrate in vivo images of brain microvasculature with image contrast reflecting the blood oxygen level, which can be used to provide in vivo real-time maps of blood oxygenation in the brain under normal physiological conditions.
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Intrinsic signal changes accompanying sensory stimulation: functional brain mapping with magnetic resonance imaging
Seiji Ogawa,David W. Tank,Ravi S. Menon,Jutta M. Ellermann,Seong-Gi Kim,Hellmut Merkle,Kamil Ugurbil +6 more
TL;DR: It is reported that visual stimulation produces an easily detectable (5-20%) transient increase in the intensity of water proton magnetic resonance signals in human primary visual cortex in gradient echo images at 4-T magnetic-field strength.
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Oxygenation-sensitive contrast in magnetic resonance image of rodent brain at high magnetic fields.
TL;DR: At high magnetic fields (7 and 8.4 T), water proton magnetic resonance images of brains of live mice and rats under pentobarbital anesthetization have been measured by a gradient echo pulse sequence with a spatial resolution of 65 × 65‐ μm pixel size and 700‐μm slice thickness.
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Functional brain mapping by blood oxygenation level-dependent contrast magnetic resonance imaging. A comparison of signal characteristics with a biophysical model.
Seiji Ogawa,Ravi S. Menon,David W. Tank,Seong-Gi Kim,Hellmut Merkle,Jutta M. Ellermann,Kamil Ugurbil +6 more
TL;DR: In this article, the authors discuss the basic quantitative features of the observed BOLD-based signal changes, including the signal amplitude and its magnetic field dependence and dynamic effects such as a pronounced oscillatory pattern that is induced in the signal from primary visual cortex during photic stimulation experiments.
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Magnetic resonance imaging of blood vessels at high fields: In vivo and in vitro measurements and image simulation
Seiji Ogawa,Tso-Ming Lee +1 more
TL;DR: This description of the contrast enhancement has been confirmed by a series of in vitro blood sample experiments and image simulations and a predicted contrast change has been demonstrated in brain images of a mouse placed at two different orientations in the magnet.