Sub-0.1 microliter CBV fMRI on the Next Generation 7T scanner

Sub-0.1 microliter CBV fMRI on the Next Generation 7T scanner
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下一代 7T 扫描仪上的 0.1 微升以下 CBV fMRI

DOI:
10.58530/2022/0397
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发表时间:
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期刊:
ISMRM Annual Meeting
影响因子:
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通讯作者:
R. Huber
R. Huber
中科院分区:
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文献类型:
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作者:
D. Feinberg;Salvatore Torrisi;A. Beckett;R. Stirnberg;T. Stöcker;P. Ehses;R. Huber

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层状特异性 fMRI 与 CBV 敏感 VASO 可以解决有关大脑区域内和跨大脑区域的定向信息处理的神经科学研究问题。然而,传统的 0.8mm 分辨率无法对感兴趣的各个层组进行奈奎斯特采样(例如,V1 中 IVc 层的 II/III 层)。在这里,我们在 NextGen 7T 扫描仪上实现、评估和应用 0.39-0.45mm (iso.) VASO 协议,以解决人类以前无法解决的层特征问题。我们发现,如果 EPI 分割和 GRAPPA 加速的序列参数与传统 fMRI 协议的优化方式不同,则 0.45 mm 协议是可能的。
Laminar-specific fMRI with CBV-sensitive VASO can address neuroscience research questions on directional information processing within and across brain areas. However, conventional 0.8mm resolutions cannot Nyquist sample the individual layer-groups of interest (e.g. Layers II/III from layer IVc in V1). Here we implement, evaluate, and apply a 0.39-0.45mm (iso.) VASO protocol on the NextGen 7T scanner to resolve layer-features that could not be resolved in humans before. We find that 0.45 mm protocols are possible if the sequence parameters of EPI-segmentation and GRAPPA acceleration are differently optimized than one would do for conventional fMRI protocols.