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相关概念视频

Alzheimer's Disease: Overview01:26

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Brain Imaging01:14

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
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阿尔茨海默氏症成像联盟

Jorge Garcia Condado1,2,3, Hannah M Klinger1, Colin Birkenbihl1

  • 1Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 23, 2025
PubMed
概括
此摘要是机器生成的。

通过BrainAge测量的大脑健康显著与阿尔茨海默病的生物标志物如粉样蛋白和相关. 更糟糕的BrainAge预测了更快的认知衰退,特别是具有更高的生物标志物水平,有助于临床试验选择.

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科学领域:

  • 神经成像和计算神经科学
  • 神经退行症的生物标志物
  • 认知衰老和阿尔茨海默氏症的疾病.

背景情况:

  • BrainAge模型通过神经成像估计生物大脑年龄,作为大脑健康指标.
  • 加快的大脑衰老与阿尔茨海默病 (AD) 有关,由粉样蛋白 (Aβ) 和病理驱动.
  • 调查BrainAge在AD生物标志物与认知衰退的关联中起的调节作用至关重要.

研究的目的:

  • 评估BrainAge是否能够缓解AD生物标志物 (Aβ,tau,p-tau217) 与纵向认知衰退之间的关系.
  • 通过两个独立的队列 (A4/LEARN和HABS) 验证发现.

主要方法:

  • 通过AgeML.使用T1加权的MRI体积和皮质厚度数据开发了BrainAge模型.
  • 通过将预测的时间年龄与时间年龄进行比较,计算了BrainAge delta (BrainAgedelta).
  • 利用线性混合效应模型来测试BrainAgedelta作为生物标志物与认知表现 (PACC) 关联的调节者,调整共变量.

主要成果:

  • 更高的Aβ-PET,Tau-PET和p-tau217水平与更糟糕的BrainAgedelta相关.
  • BrainAgedelta直接影响了认知轨迹,并缓解了Aβ/Tau-PET和认知衰退之间的关联,表明生物标志物更高和BrainAge更差的下降速度更快.
  • 在一个队列中观察到p-tau217的类似适度.

结论:

  • BrainAgedelta是大脑健康的强有力的标志物,与AD病理和认知衰退有显著的关联.
  • BrainAgedelta可以缓解AD生物标志物对认知轨迹的影响.
  • 在临床试验中使用BrainAgedelta可以优化参与者选择并增强对神经退行症的理解.