Abstract
Background
Resting-state functional magnetic resonance imaging (R-fMRI) is a promising tool in clinical application, especially in presurgical mapping for neurosurgery. This study aimed to investigate the sensitivity and specificity of R-fMRI in the localization of hand motor area in patients with brain tumors validated by direct cortical stimulation (DCS). We also compared this technique to task-based blood oxygenation level-dependent (BOLD) fMRI (T-fMRI).
Methods
R-fMRI and T-fMRI were acquired from 17 patients with brain tumors. The cortex sites of the hand motor area were recorded by DCS. Site-by-site comparisons between R-fMRI/T-fMRI and DCS were performed to calculate R-fMRI and T-fMRI sensitivity and specificity using DCS as a “gold standard”. R-fMRI and T-fMRI performances were compared statistically
Results
A total of 609 cortex sites were tested with DCS and compared with R-fMRI findings in 17 patients. For hand motor area localization, R-fMRI sensitivity and specificity were 90.91 and 89.41 %, respectively. Given that two subjects could not comply with T-fMRI, 520 DCS sites were compared with T-fMRI findings in 15 patients. The sensitivity and specificity of T-fMRI were 78.57 and 84.76 %, respectively. In the 15 patients who successfully underwent both R-fMRI and T-fMRI, there was no statistical difference in sensitivity or specificity between the two methods (p = 0.3198 and p = 0.1431, respectively)
Conclusions
R-fMRI sensitivity and specificity are high for localizing hand motor area and even equivalent or slightly higher compared with T-fMRI. Given its convenience for patients, R-fMRI is a promising substitute for T-fMRI for presurgical mapping


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The authors would like to thank Jian-bing Shi and Zhong Yang for assembling the image database, Gen Xu for direct cortical stimulation, and Yan-yan Song for statistical analysis.
Author contributions
Study concept and design: Zhou and Wu. Processing of data: Qiu, Zhuang, Yao, Lu, Zhu, and Tang. Analysis and interpretation of data: Qiu and Yan. Drafting of the manuscript: Qiu and Yan. Critical revision of the manuscript for important intellectual content: Wu, Mao and Zhou.
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Funding
This work was funded by the National Natural Science Foundation of China (Project No. 81271517, 81171295), The National Key Technology R&D Program of China (No. 2014BAI04B05), and Shanghai Municipal Health Bureau (XBR2011022).
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Tian-ming Qiu and Chao-gan Yan contributed equally to this paper.
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Qiu, Tm., Yan, Cg., Tang, Wj. et al. Localizing hand motor area using resting-state fMRI: validated with direct cortical stimulation. Acta Neurochir 156, 2295–2302 (2014). https://doi.org/10.1007/s00701-014-2236-0
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DOI: https://doi.org/10.1007/s00701-014-2236-0
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