Exploring the post-stimulus undershoot with spin-echo fMRI: implications for models of neurovascular responseBenedikt A Poser
Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg Essen, Essen, Germany
Hum Brain Mapp 32:141-53. 2011
..In addition, we found that an 'arteriolar balloon' (delayed arterial compliance) may provide a plausible explanation for the temporal characteristics of the BOLD undershoot...
- Application of whole-brain CBV-weighted fMRI to a cognitive stimulation paradigm: robust activation detection in a stroop task experiment using 3D GRASE VASO
Benedikt A Poser
Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg Essen, Essen, Germany
Hum Brain Mapp 32:974-81. 2011
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- 3D single-shot VASO using a Maxwell gradient compensated GRASE sequence
Benedikt A Poser
Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg Essen, Essen, Germany
Magn Reson Med 62:255-62. 2009
..39% and -6.93). The method makes it possible to perform whole-brain cognitive activation studies based on CBV contrast...
Three dimensional echo-planar imaging at 7 TeslaB A Poser
Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg Essen, Essen, Germany
Neuroimage 51:261-6. 2010
..From our results, and several other practical advantages of 3D over 2D EPI found in the present study, we conclude that 3D EPI provides a useful alternative for whole-brain fMRI at 7 T, not only when high-resolution data are required...
BOLD contrast sensitivity enhancement and artifact reduction with multiecho EPI: parallel-acquired inhomogeneity-desensitized fMRIBenedikt A Poser
FC Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands
Magn Reson Med 55:1227-35. 2006
..The use of parallel imaging markedly reduces image distortion, and hence the method should find widespread application in functional brain imaging...
- A dual echo approach to removing motion artefacts in fMRI time series
Pieter F Buur
Donders Institute for Brain, Cognition and Behaviour, Donders Centre for Cognitive Neuroimaging, Radboud University Nijmegen, Nijmegen, The Netherlands
NMR Biomed 22:551-60. 2009
..5 and 3 T show improvements in functional activation maps for individual subjects. The method is straightforward to implement, does not require extra scan time and can easily be embedded in a multi-echo acquisition framework...
- Investigating the benefits of multi-echo EPI for fMRI at 7 T
Benedikt A Poser
Erwin L Hahn Institute for Magnetic Resonance Imaging, University Duisburg Essen, Essen Germany
Neuroimage 45:1162-72. 2009
..The results at typical spatial resolution show that multi-echo EPI acquisition leads to considerable artifact reduction and sensitivity gains, making it superior to conventional GE-EPI for fMRI at 7 T...
- Time-interleaved acquisition of modes: an analysis of SAR and image contrast implications
S Orzada
University Duisburg Essen, Essen, Germany
Magn Reson Med 67:1033-41. 2012
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- Measurement of activation-related changes in cerebral blood volume: VASO with single-shot HASTE acquisition
Benedikt A Poser
FC Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands
MAGMA 20:63-7. 2007
..The use of GE-EPI has potential disadvantages: (a) the non-zero TE may lead to BOLD contamination and (b) images suffer from the EPI-typical inhomogeneity artefacts...
- Fast spin echo sequences for BOLD functional MRI
Benedikt A Poser
FC Donders Centre for Cognitive Neuroimaging, Trigon 181, P O Box 9101, 6500 HB, Nijmegen, The Netherlands
MAGMA 20:11-7. 2007
..Our data also indicate that the BOLD post-stimulus undershoot is most probably attributable to persistent elevated oxygen metabolism rather than to delayed vascular compliance...
