双波长自光成像的高级分析工具:ALSTAR2基线
Andreas Berlin1,2, Lukas Goerdt1,3, Mark E Clark1
1Ophthalmology and Visual Sciences, The University of Alabama at Birmingham, Heersink School of Medicine, Birmingham, AL, USA.
Translational vision science & technology
|August 21, 2025
概括
新的自动化工具准确地集中和分类斑点色素光密度 (MPOD) 的分布. 这些进步有助于研究黄类胡卜素,视力健康以及与年龄相关的黄斑退化.
科学领域:
- 眼科 眼科
- 视觉科学
- 医学成像
背景情况:
- 斑点色素光学密度 (MPOD) 对于视力和理解与年龄相关的斑点退化 (AMD) 是至关重要的.
- 准确测量和分类MPOD分布对于研究至关重要.
- 目前的MPOD分析方法可能是劳动密集型和主观的.
研究的目的:
- 开发和验证用于集中和分类MPOD分布模式的自动化工具.
- 通过大规模的研究来研究类胡卜素在视力和AMD进展中的作用.
主要方法:
- 在老年和年轻的健康眼睛中使用双波长自发光成像.
- 开发了自定义的FIJI插件,使用五种算法 (HILLCLIMB,CONTOUR,FOVEA,CENTROID,MAX) 进行MPOD集中.
- 实现了MPOD空间分布的自动分类,分为峰值,环状,混合和入模式.
主要成果:
- 在HILLCLIMB和CONTOUR算法中,最好的一致性与手动的中心确定.
- 在老年人眼中,峰值模式是最常见的 (68.4%),其次是环形 (18.1%),滴形 (7.2%) 和混合型 (6.3%).
- 年轻的眼睛主要表现为峰值模式 (90%). 根据性别和透镜状况观察到MPOD模式的显著差异.
结论:
- 自动化的MPOD集中和分类工具可靠且强大.
- 开发的软件有助于对MPOD分布进行大规模分析.
- 研究结果表明,MPOD的空间分布因性别,透镜状况和年龄而异,这可能会影响未来的AMD研究.
相关概念视频
01:18Mass Spectrometry: Long-Chain Alkane Fragmentation
The molecular ions of linear alkanes prefer to fragment at the carbon-carbon bond away from the end of the chain since the cleavage of an inner bond creates a stable carbocation and a stable radical. Consequently, the mass signals of linear alkanes feature intense peaks in the middle of the mass-to-charge ratio plot with weaker peaks on either end. The fragmentation of each carbon-carbon bond with the release of a methyl group in each splitting leads to prominent peaks in the mass spectra...
01:26Spectroscopy of Carboxylic Acid Derivatives
Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and unsymmetrical carbonyl vibration.
In the...
In the...
01:29Mass Spectrometry: Branched Alkane Fragmentation
This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
01:21Mass Spectrometry: Complex Analysis
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
01:22Atomic Absorption Spectroscopy: Instrumentation
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
01:22Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.