High spatial resolution brain functional MRI using submillimeter balanced steady-state free precession acquisition

Pei Hsin Wu, Ping Huei Tsai, Ming Long Wu, Tzu Chao Chuang, Yi Yu Shih, Hsiao Wen Chung, Teng Yi Huang

研究成果: 雜誌貢獻文章

2 引文 斯高帕斯(Scopus)

摘要

Purpose: One of the technical advantages of functional magnetic resonance imaging (fMRI) is its precise localization of changes from neuronal activities. While current practice of fMRI acquisition at voxel size around 3 × 3 × 3 mm3 achieves satisfactory results in studies of basic brain functions, higher spatial resolution is required in order to resolve finer cortical structures. This study investigated spatial resolution effects on brain fMRI experiments using balanced steady-state free precession (bSSFP) imaging with 0.37 mm3 voxel volume at 3.0 T. Methods: In fMRI experiments, full and unilateral visual field 5 Hz flashing checkerboard stimulations were given to healthy subjects. The bSSFP imaging experiments were performed at three different frequency offsets to widen the coverage, with functional activations in the primary visual cortex analyzed using the general linear model. Variations of the spatial resolution were achieved by removing outer k-space data components. Results: Results show that a reduction in voxel volume from 3.44 × 3.44 × 2 mm3 to 0.43 × 0.43 × 2 mm 3 has resulted in an increase of the functional activation signals from (7.7 ± 1.7)% to (20.9 ± 2.0)% at 3.0 T, despite of the threefold SNR decreases in the original images, leading to nearly invariant functional contrast-to-noise ratios (fCNR) even at high spatial resolution. Activation signals aligning nicely with gray matter sulci at high spatial resolution would, on the other hand, have possibly been mistaken as noise at low spatial resolution. Conclusions: It is concluded that the bSSFP sequence is a plausible technique for fMRI investigations at submillimeter voxel widths without compromising fCNR. The reduction of partial volume averaging with nonactivated brain tissues to retain fCNR is uniquely suitable for high spatial resolution applications such as the resolving of columnar organization in the brain.

原文英語
文章編號122304
期刊Medical Physics
40
發行號12
DOIs
出版狀態已發佈 - 十二月 2013

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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    Wu, P. H., Tsai, P. H., Wu, M. L., Chuang, T. C., Shih, Y. Y., Chung, H. W., & Huang, T. Y. (2013). High spatial resolution brain functional MRI using submillimeter balanced steady-state free precession acquisition. Medical Physics, 40(12), [122304]. https://doi.org/10.1118/1.4828789