Functional interferometric diffusing wave spectroscopy of the human brain.

Functional interferometric diffusing wave spectroscopy of the human brain.
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DOI:
10.1126/sciadv.abe0150
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发表时间:
2021-05
期刊:
影响因子:
13.6
通讯作者:
Srinivasan VJ
Srinivasan VJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhou W;Kholiqov O;Zhu J;Zhao M;Zimmermann LL;Martin RM;Lyeth BG;Srinivasan VJ

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新技术无创监测成年人的脑血流指数和脑功能。脑血流量(CBF)对大脑功能至关重要,CBF相关信号可以告知我们大脑活动。然而,目前,需要高端医疗仪器来对成年人进行CBF测量。在这里,我们描述了功能性干涉漫射波谱(fiDWS),它通过头皮引入和收集近红外光,使用廉价的检测器阵列来快速监测编码脑血流指数(BFI)的相干光波动,CBF的替代品。与其他功能光学方法相比,fiDWS测量BFI更快,更深,同时还提供连续波吸收信号。在3.5 cm的源-收集器间隔处实现清晰的脉动BFI波形,我们证实光学BFI,而不是吸收,显示出与人类脑血管生理学一致的分级高碳酸血症反应,并且BFI在大脑激活期间具有比吸收更好的对比度噪声比。通过以低成本提供光学BFI的高通量测量,fiDWS将扩大对CBF的访问。
New technology noninvasively monitors cerebral blood flow index and brain function in adult humans. Cerebral blood flow (CBF) is essential for brain function, and CBF-related signals can inform us about brain activity. Yet currently, high-end medical instrumentation is needed to perform a CBF measurement in adult humans. Here, we describe functional interferometric diffusing wave spectroscopy (fiDWS), which introduces and collects near-infrared light via the scalp, using inexpensive detector arrays to rapidly monitor coherent light fluctuations that encode brain blood flow index (BFI), a surrogate for CBF. Compared to other functional optical approaches, fiDWS measures BFI faster and deeper while also providing continuous wave absorption signals. Achieving clear pulsatile BFI waveforms at source-collector separations of 3.5 cm, we confirm that optical BFI, not absorption, shows a graded hypercapnic response consistent with human cerebrovascular physiology, and that BFI has a better contrast-to-noise ratio than absorption during brain activation. By providing high-throughput measurements of optical BFI at low cost, fiDWS will expand access to CBF.
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