期刊
NEUROIMAGE
卷 113, 期 -, 页码 279-288出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2015.03.060
关键词
Arterial spin labeling (ASL); Simultaneous multi-slice (SMS); Multiband (MB); Turbo-FLASH (TFL); Cerebral blood flow (CBF)
资金
- National Institute of Health (NIH) [R01-MH080892, R01-NS081077, R01-EB014922]
- NIH Human Connectome Project [NIH U54MH091657]
- Biomedical Technology Resource Centers (BTRC) National Center for Research Resources (NCRR) [P41 RR08079]
- National Institute of Biomedical Imaging and Bioengineering (NIBIB) [P41 EB015894]
- Siemens Healthcare USA, Inc.
Simultaneous multi-slice (SMS) ormultiband (MB) imaging has recently been attempted for arterial spin labeled (ASL) perfusion MRI in conjunction with echo-planar imaging (EPI) readout. It was found that SMS-EPI can reduce the T-1 relaxation effect of the label and improve image coverage and resolution with little penalty in signal-to-noise ratio (SNR). However, EPI still suffers from geometric distortion and signal dropout from field inhomogeneity effects especially at high and ultrahigh magnetic fields. Here we present a novel scheme for achieving high fidelity distortion-free quantitative perfusion imaging by combining pseudo-continuous ASL (pCASL) with SMS Turbo-FLASH (TFL) readout at both 3 and 7 T. Bloch equation simulation was performed to characterize and optimize the TFL-based pCASL perfusion signal. Two MB factors (3 and 5) were implemented in SMS-TFL pCASL and compared with standard 2D TFL and EPI pCASL sequences. The temporal SNR of SMS-TFL pCASL relative to that of standard TFL pCASL was 0.76 +/- 0.10 and 0.74 +/- 0.11 at 7 T and 0.70 +/- 0.05 and 0.65 +/- 0.05 at 3 T for MB factor of 3 and 5, respectively. By implementing background suppression in conjunction with SMS-TFL at 3 T, the relative temporal SNR improved to 0.84 +/- 0.09 and 0.79 +/- 0.10 for MB factor of 3 and 5, respectively. Compared to EPI pCASL, significantly increased temporal SNR (p < 0.001) and improved visualization of orbitofrontal cortex were achieved using SMS-TFL pCASL. By combining SMS acceleration with TFL pCASL, we demonstrated the feasibility for whole brain distortion-free quantitative mapping of cerebral blood flow at high and ultrahigh magnetic fields. (C) 2015 Elsevier Inc. All rights reserved.
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