Implementation of vascular-space-occupancy MRI at 7T.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Jun HuaPeter C M van Zijl

Abstract

Vascular-space-occupancy (VASO) MRI exploits the difference between blood and tissue T1 to null blood signal and measure cerebral blood volume changes using the residual tissue signal. VASO imaging is more difficult at higher field because of sensitivity loss due to the convergence of tissue and blood T1 values and increased contamination from blood-oxygenation-level-dependent (BOLD) effects. In addition, compared to 3T, 7T MRI suffers from increased geometrical distortions, e.g., when using echo-planar-imaging, and from increased power deposition, the latter especially problematic for the spin-echo-train sequences commonly used for VASO MRI. Third, non-steady-state blood spin effects become substantial at 7T when only a head coil is available for radiofrequency transmit. In this study, the magnetization-transfer-enhanced-VASO approach was applied to maximize tissue-blood signal difference, which boosted signal-to-noise ratio by 149% ± 13% (n = 7) compared to VASO. Second, a 3D fast gradient-echo sequence with low flip-angle (7°) and short echo-time (1.8 ms) was used to minimize the BOLD effect and to reduce image distortion and power deposition. Finally, a magnetization-reset technique was combined with a motion-sensitized-dri...Continue Reading

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Citations

Dec 6, 2014·NeuroImage·Laurentius HuberHarald E Möller
Nov 3, 2015·NeuroImage·Laurentius HuberBenedikt A Poser
Aug 22, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Laurentius HuberRobert Turner
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Dec 18, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jun HuaCraig K Jones
Sep 10, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Steffen N KriegerGary F Egan
Jul 2, 2016·NeuroImage·Maria GuidiHarald E Möller
Jun 20, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Alexander J S BeckettDavid A Feinberg
Jun 9, 2020·Progress in Neurobiology·Laurentius HuberBenedikt A Poser
May 4, 2017·NeuroImage·Jonathan R PolimeniBruce Fischl
May 27, 2021·NeuroImage·Laurentius Renzo HuberAneurin J Kennerley

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