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Schlagwörter:
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Zusammenfassung:
Purpose
The goal of this study is to develop and evaluate a multiline balanced steady-state free-precession (bSSFP) sequence for passband functional MRI at ultrahigh field.
Methods
Passband bSSFP functional MRI experiments using a visual task were performed on a 9.4 T system with echo trains ranging from one up to seven echoes. We analyze the acquisition efficiency, temporal and thermal signal-to-noise ratio, as well as the observed blood oxygen–level-dependent (BOLD) signal changes.
Results
With increasing repetition time and echo train length, the BOLD-related signal change as well as the thermal and temporal noise were improved. Activation patterns and signal changes were stable and reproducible across subjects.
Conclusions
We propose a multiline bSSFP for functional BOLD imaging that approaches the speed of echo-planar imaging and that shows an increased BOLD sensitivity compared with single-line bSSFP.
