生物标志物 生物标志物
Pulkit Khandelwal1,2, Sydney A Lim2, Wilma D J Van de Berg3,4
1Penn Image Computing and Science Laboratory (PICSL), University of Pennsylvania, Philadelphia, PA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
概括
我们开发了一种新的管道,可以准确地细分和记录ex vivo和in situMRI扫描. 这种方法使得在痴呆症研究中大脑形态测量和组织病理学之间有更强烈的关联.
科学领域:
- 神经成像是一种神经成像.
- 医学图像分析 医学图像分析
- 神经病理学神经病理学
背景情况:
- 痴呆症研究在理解混合病因和非典型阿尔茨海默病方面面临挑战,原因是体内MRI和尸检之间的延迟.
- 死后现场核磁共振是一个代理,但在后勤上很困难,而活体核磁共振提供更高的分辨率,但受到固定和变形的影响.
研究的目的:
- 引入一个名为"紫MRI"的全半球ex-vivo到in-situ/in-vivo分片和注册管道.
- 为了实现多分辨率,翻译和临床相关性,用于ex-vivo (T2w 7T 0.3 mm3) 和in-situ (T1w 3T 1x0.5x0.5 mm3) 的MRI.
- 为了促进形态测量和组织病理学检查之间的更强的关联研究.
主要方法:
- 结合深度学习细分与经典的基于表面的建模,用于使用DKT图谱的ex-vivo脑半球分片.
- 开发了一个两阶段的inter-modality diffeomorphic图像记录在ex-vivo和in-situMRI之间.
- 使用FreeSurfer进行DKT基于地图的实地MRI细分.
主要成果:
- "紫色-MRI"管道准确地细分出活体半球,并记录了相应的现场MRI,处理成像文物.
- 在ex-vivo和in-situMRI之间,在几个大脑区域的区域智能体积和平均厚度之间观察到显著的相关性.
- 厚度测量的相关性强度由于受损组织区域的细分挑战而略有下降.
结论:
- "紫色MRI"管道准确地分割高分辨率的外体MRI并将其与多模态尸体MRI进行注册.
- 这个管道为ex-vivo到in-vivo注册奠定了基础.
- 允许大脑形态测量和组织病理学发现之间进行更强的关联研究.
相关概念视频
01:20Blood Studies for Cardiovascular System I: Cardiac Biomarkers
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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
749
01:19Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
516