相关实验视频

Updated: Jun 13, 2025

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

在初级开角青光眼患者的视觉,认知和情绪大脑区域的不规则的时间波动

Qian Wang¹, Bingbing Yang¹, Xiaoxia Qu¹

¹Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China.

|June 11, 2025

概括

初级开角青光眼 (POAG) 患者表现出改变的动态大脑活动,特别是在视觉网络中. 这种使用dALFF的动态分析显示了改善这种神经退行性疾病的理解和诊断的潜力.

科学领域:

神经科学是一个神经科学.
眼科医生眼科眼科
医疗成像医学成像

背景情况:

主要开角青光眼 (POAG) 越来越多地被认为是一种神经退行性疾病.
以前的神经成像研究经常忽视动态大脑活动,专注于静态模式的静态状态fMRI (rs-fMRI).
内在的大脑活动本质上是动态的,随着时间的推移而波动,需要先进的分析方法.

研究的目的:

通过使用动态功能连接分析,研究POAG患者的时间变化的大脑活动模式.
为了比较POAG患者和健康对照者 (HCs) 之间的动态大脑活动.
探索POAG中动态大脑活动和临床测量之间的相关性.

主要方法:

对rs-fMRI数据进行了时间动态分析,对70名POAG患者和45名HC进行了分析.
使用滑窗方法计算低频波动的动态振幅 (dALFF).
使用多变量模式分析来评估dALFF和静态-ALFF的区分能力.

主要成果:

与HC相比,POAG患者在视觉网络区域的dALFF下降,在默认模式,腹部注意力和前侧双相网络的dALFF增加.
减少cuneus dALFF与视野缺陷有显著的相关性.
视觉网络中的动态ALFF准确地将POAG患者与HC患者区分开来 (准确率为79.13%),并且表现优于静态ALFF.

结论:

POAG的特点是不规则的时间变化的大脑活动,影响视觉,运动和认知/情绪功能.
动态ALFF分析提供了一种新的方法来捕捉POAG中异常的大脑活动.
这种方法有望提高对POAG病理生理学的理解,并提高诊断能力.

关键词:

低频波动的动态振幅低频波动的动态振幅.多变量模式分析多变量模式分析主要的开放角光眼.休息状态的fMRI.

更多相关视频

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Published on: December 8, 2023

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments

Published on: April 24, 2020

相关概念视频

Glaucoma: Overview

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...

Open Angle Glaucoma: Treatment

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...

Angle Closure Glaucoma: Treatment

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...

Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...