Search Results - "KOOPMANS, Peter J"

Simultaneous multislice (SMS) imaging techniques by Barth, Markus, Breuer, Felix, Koopmans, Peter J., Norris, David G., Poser, Benedikt A.

“…Simultaneous multislice imaging (SMS) using parallel image reconstruction has rapidly advanced to become a major imaging technique. The primary benefit is an…”
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Magnetization transfer weighted laminar fMRI with multi-echo FLASH by Pfaffenrot, Viktor, Koopmans, Peter J.

“…•Multi-echo magnetization transfer prepared laminar fMRI at 7 T in humans.•Multi-echo data show higher signal change at very short TE and less extravascular…”
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Laminar Organization of Working Memory Signals in Human Visual Cortex by Lawrence, Samuel J.D., van Mourik, Tim, Kok, Peter, Koopmans, Peter J., Norris, David G., de Lange, Floris P.

“…The human primary visual cortex (V1) is not only activated by incoming visual information but is also engaged by top-down cognitive processes, such as visual…”
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Layer-specific BOLD activation in human V1 by Koopmans, Peter J., Barth, Markus, Norris, David G.

“…The neocortex is known to have a distinct laminar structure which has previously been probed in animals using high‐resolution fMRI. Detection of layer‐specific…”
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Laminar fMRI using T2-prepared multi-echo FLASH by Pfaffenrot, Viktor, Voelker, Maximilian N., Kashyap, Sriranga, Koopmans, Peter J.

“…Functional magnetic resonance imaging (fMRI) using blood oxygenation level dependent (BOLD) contrast at a sub-millimeter scale is a promising technique to…”
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Improved cortical boundary registration for locally distorted fMRI scans by van Mourik, Tim, Koopmans, Peter J, Norris, David G

“…With continuing advances in MRI techniques and the emergence of higher static field strengths, submillimetre spatial resolution is now possible in human…”
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Power independent of number of slices (PINS) radiofrequency pulses for low-power simultaneous multislice excitation by Norris, David G., Koopmans, Peter J., Boyacioğlu, Rasim, Barth, Markus

“…This communication describes radiofrequency pulses capable of performing spatially periodic excitation, inversion, and refocusing. The generation of such…”
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Application of PINS radiofrequency pulses to reduce power deposition in RARE/turbo spin echo imaging of the human head by Norris, David G., Boyacioğlu, Rasim, Schulz, Jenni, Barth, Markus, Koopmans, Peter J.

“…Purpose To explore the use of PINS radiofrequency (RF) pulses to reduce RF power deposition in multiband/simultaneous multislice imaging with the RARE/turbo…”
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Strategies and prospects for cortical depth dependent T2 and T2 weighted BOLD fMRI studies by Koopmans, Peter J., Yacoub, Essa

“…Technological advancements in fMRI have afforded the opportunity to conduct submillimeter investigations into human brain function. The ability to do cortical…”
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Two‐dimensional‐NGC‐SENSE‐GRAPPA for fast, ghosting‐robust reconstruction of in‐plane and slice‐accelerated blipped‐CAIPI echo planar imaging by Koopmans, Peter J.

“…Purpose Ghosting‐robust reconstruction of blipped‐CAIPI echo planar imaging simultaneous multislice data with low computational load. Methods To date,…”
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Enhanced POCS reconstruction for partial Fourier imaging in multi‐echo and time‐series acquisitions by Koopmans, Peter J., Pfaffenrot, Viktor

“…Purpose To improve partial Fourier (PF) imaging reconstruction in time‐series or multi‐echo acquisitions. Methods Many PF methods use a phase estimate to…”
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The relationship between oscillatory EEG activity and the laminar-specific BOLD signal by Scheeringa, René, Koopmans, Peter J., van Mourik, Tim, Jensen, Ole, Norris, David G.

“…Electrophysiological recordings in animals have indicated that visual cortex γ-band oscillatory activity is predominantly observed in superficial cortical…”
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Multi-echo fMRI of the cortical laminae in humans at 7T by Koopmans, Peter J., Barth, Markus, Orzada, Stephan, Norris, David G.

“…Recent developments in ultra high field MRI and receiver coil technology have opened up the possibility of laminar fMRI in humans. This could offer greater…”
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Layer-Specific BOLD Activation in Human VI by KOOPMANS, Peter J, BARTH, Markus, NORRIS, David G

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Multi-echo fMRI of the cortical laminae in humans at 7 T by Koopmans, Peter J, Barth, Markus, Orzada, Stephan, Norris, David G

“…Recent developments in ultra high field MRI and receiver coil technology have opened up the possibility of laminar fMRI in humans. This could offer greater…”
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A hemodynamic model for layered BOLD signals by Heinzle, Jakob, Koopmans, Peter J., den Ouden, Hanneke E.M., Raman, Sudhir, Stephan, Klaas Enno

“…High-resolution blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) at the sub-millimeter scale has become feasible with recent…”
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Reducing slab boundary artifacts in three-dimensional multislab diffusion MRI using nonlinear inversion for slab profile encoding (NPEN) by Wu, Wenchuan, Koopmans, Peter J., Frost, Robert, Miller, Karla L.

“…Purpose To propose a method to reduce the slab boundary artifacts in three‐dimensional multislab diffusion MRI. Methods Bloch simulation is used to investigate…”
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Relating neural oscillations to laminar fMRI connectivity in visual cortex by Scheeringa, René, Bonnefond, Mathilde, van Mourik, Tim, Jensen, Ole, Norris, David G, Koopmans, Peter J

“…Abstract Laminar functional magnetic resonance imaging (fMRI) holds the potential to study connectivity at the laminar level in humans. Here we analyze…”
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Improved sensitivity and specificity for resting state and task fMRI with multiband multi-echo EPI compared to multi-echo EPI at 7 T by Boyacioğlu, Rasim, Schulz, Jenni, Koopmans, Peter J, Barth, Markus, Norris, David G

“…A multiband multi-echo (MBME) sequence is implemented and compared to a matched standard multi-echo (ME) protocol to investigate the potential improvement in…”
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k-t FASTER: Acceleration of functional MRI data acquisition using low rank constraints by Chiew, Mark, Smith, Stephen M., Koopmans, Peter J., Graedel, Nadine N., Blumensath, Thomas, Miller, Karla L.

“…Purpose In functional MRI (fMRI), faster sampling of data can provide richer temporal information and increase temporal degrees of freedom. However,…”
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