分段自旋回声回声平面成像改善了整个大脑的功能性MRI在醒着的子大脑中
Mina Khodadadi1,2, Xavier Helluy1,3, Onur Güntürkün1,4
1Department of Biopsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr-University Bochum, Bochum, Germany.
NMR in biomedicine
|September 8, 2023
概括
一种新的两段旋回回声平面成像 (SE-EPI) 序列改善了子的全脑功能磁共振成像 (fMRI). 这种先进的fMRI方法为研究鸟类认知提供了更高的血氧水平依赖 (BOLD) 灵敏度.
科学领域:
- 神经科学是一个神经科学.
- 生物医学工程 生物医学工程
- 动物认知研究 动物认知研究
背景情况:
- 鸟类大脑的高场功能磁共振成像 (fMRI) 对于理解认知行为至关重要.
- 鸟类头骨中的空气腔导致磁场不均,限制了fMRI数据采集.
- 像快速获取与放松增强 (RARE) fMRI这样的现有方法具有有限的血氧水平依赖 (BOLD) 灵敏度和时间分辨率.
研究的目的:
- 在清醒的子中实施和评估全脑fMRI的两段旋回声回声平面成像 (SE-EPI) 序列.
- 为了比较新的SE-EPI序列与鸟类fMRI单次射击RARE序列的性能.
- 评估SE-EPI适用于研究神经网络的适用性,例如听觉网络.
主要方法:
- 开发和应用一个两段的SE-EPIMRI序列.
- 在清醒的子中获取全脑fMRI数据.
- 对SE-EPI和单次射击RARE序列的比较分析,涉及BOLD灵敏度,信号噪声比 (SNR),时间分辨率和激活模式对称性.
主要成果:
- 两段的SE-EPI序列在清醒的子中实现了全脑覆盖.
- 与RARE相比,SE-EPI在更短的获取时间内 (3s vs 4s) 显示了超过两倍的BOLD灵敏度.
- SE-EPI产生了更对称和更大的激活模式,具有相似的图像和时间SNR,并减少了能量沉积.
结论:
- 双细分的SE-EPI是鸟类fMRI中RARE的可行和有利的替代方案.
- 这种方法提高了BOLD灵敏度和时间分辨率,这对于研究鸟类神经网络至关重要.
- 改进的序列使得在鸟类模型中更全面地对认知功能进行全脑分析.
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