NDLI: Whole-brain three-dimensional T2-weighted BOLD functional magnetic resonance imaging at 7 Tesla

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Whole-brain three-dimensional T2-weighted BOLD functional magnetic resonance imaging at 7 Tesla

Content Provider	Scilit
Author	Hua, Jun Qin, Qin van Zijl, Peter C. M. Pekar, James J. Jones, Craig K.
Copyright Year	2013
Description	Journal: Magnetic Resonance in Medicine A new acquisition scheme for T2-weighted spin-echo BOLD fMRI is introduced. It uses a T2-preparation module to induce blood-oxygenation-level-dependent (BOLD) contrast, followed by a single-shot three-dimensional (3D) fast gradient-echo readout with short echo time (TE). It differs from most spin-echo BOLD sequences in that BOLD contrast is generated before the readout, which eliminates the "dead time" due to long TE required for T2 contrast, and substantially improves acquisition efficiency. This approach, termed "3D T2prep-GRE," was implemented at 7 Tesla (T) with a typical spatial (2.5 × 2.5 × 2.5 mm(3) ) and temporal (TR = 2.3 s) resolution for functional MRI (fMRI) and whole-brain coverage (55 slices), and compared with the widely used 2D spin-echo EPI sequence. In fMRI experiments of simultaneous visual/motor activities, 3D T2prep-GRE showed minimal distortion and little signal dropout across the whole brain. Its lower power deposition allowed greater spatial coverage (55 versus 17 slices with identical TR, resolution and power level), temporal SNR (60% higher) and CNR (35% higher) efficiency than 2D spin-echo EPI. It also showed smaller T2* contamination. This approach is expected to be useful for ultra-high field fMRI, especially for regions near air cavities. The concept of using T2-preparation to generate BOLD contrast can be combined with many other sequences at any field strength.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4055555/pdf
Ending Page	1540
Page Count	11
Starting Page	1530
e-ISSN	15222594
DOI	10.1002/mrm.25055
Journal	Magnetic Resonance in Medicine
Issue Number	6
Volume Number	72
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2013-12-12
Access Restriction	Open
Subject Keyword	Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Blood-oxygenation-level-dependent Fast Gradient Echo
Content Type	Text
Resource Type	Article

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