共查询到1条相似文献,搜索用时 15 毫秒
1.
Nina Theysohn MD Shaozheng Qin PhD Stefan Maderwald PhD Benedikt A. Poser PhD Jens M. Theysohn MD Mark E. Ladd PhD David G. Norris PhD Elke R. Gizewski MD PhD Guillen Fernandez MD PhD Indira Tendolkar MD PhD 《Journal of neuroimaging》2013,23(4):445-451
High field strength functional magnetic resonance imaging (fMRI) has developed rapidly. However, it suffers from increased artifacts in brain regions such as the medial temporal lobe (MTL), challenging functional imaging of the hippocampus with the objective of high‐spatial resolution, which is particularly useful for this region both from a clinical and cognitive neuroscience perspective. We set out to compare a BOLD sequence at 7 T versus 3 T to visualize the MTL activity during an associative memory‐encoding task. Twenty‐eight healthy volunteers underwent a blocked‐design fMRI at either 3 T or 7 T while performing a face‐profession associative memory encoding task. Qualitative analyses of overall image quality revealed that functional images at 7 T were of high quality, showing a good white/gray matter contrast, with reasonably acceptable signal dropouts and artifacts at the lower portion of the temporal lobe. Analyses of task‐related fMRI data revealed robust activations in the bilateral MTL during associative memory encoding at both field strengths. Notably, we observed significantly stronger memory‐related hippocampal activation at 7 T than at 3 T, suggesting higher BOLD sensitivity at 7 T. These results are discussed in the light of the feasibility of 7 T scanning protocols for the MTL. 相似文献