The effect of acquisition resolution on orientation decoding from V1: comparison of 3T and 7T

The effect of acquisition resolution on orientation decoding from V1: comparison of 3T and 7T
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V1 采集分辨率对方向解码的影响:3T 和 7T 的比较

DOI:
10.1101/305417
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发表时间:
--
期刊:
bioRxiv
影响因子:
--
通讯作者:
Pollmann
Pollmann
中科院分区:
--
文献类型:
--
作者:
Sengupta;Yakupov;Kanowski;Tempelmann;Pollmann

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先前发表的结果表明,在空间采集分辨率下,从 V1 峰值的 7 特斯拉 fMRI 数据解码视觉方向的准确性可以通过更传统的 3 特斯拉扫描仪进行常规访问。本研究直接比较了 3 特斯拉和 7 特斯拉数据集之间的解码性能,这些数据集是通过应用相同的分析程序使用相同的刺激范例获得的。结果表明,基于 3 Tesla 数据构建的解码模型相对受损。此外,我们没有发现任何证据表明 BOLD 信号变化幅度或时间信噪比 (tSNR) 与解码性能存在强耦合。通过相同分辨率下的多频带 fMRI 采集直接增强 tSNR 并不能转化为解码性能的提高。仅在 3 毫米采集分辨率下,额外的体素选择即可将 3 Tesla 解码性能提升至 7 Tesla 水平。在这两个数据集中,可用于方向解码的 BOLD 信号在空间上是宽带的,但是,与 BOLD 点扩散函数的大小一致,3 特斯拉的解码模型利用空间上较粗糙的图像分量。
Previously published results indicate that the accuracy of decoding visual orientation from 7 Tesla fMRI data of V1 peaks at spatial acquisition resolutions that are routinely accessible with more conventional 3 Tesla scanners. This study directly compares the decoding performance between a 3 Tesla and a 7 Tesla dataset that were acquired using the same stimulation paradigm by applying an identical analysis procedure. The results indicate that decoding models built on 3 Tesla data are comparatively impaired. Moreover, we found no evidence for a strong coupling of BOLD signal change magnitude or temporal signal to noise ratio (tSNR) with decoding performance. Direct enhancement of tSNR via multiband fMRI acquisition at the same resolution did not translate into improved decoding performance. Additional voxel selection can boost 3 Tesla decoding performance to the 7 Tesla level only at a 3 mm acquisition resolution. In both datasets the BOLD signal available for orientation decoding is spatially broadband, but, consistent with the size of the BOLD point-spread-function, decoding models at 3 Tesla utilize spatially coarser image components.
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