概括
在干扰测近红外光谱学 (iNIRS) 中研究更长的波长可以显著提高信号噪声比 (SNR). 这一进步提高了生物组织的飞行时间 (TOF) 解析测量.
科学领域:
- 生物医学光学 生物医学光学
- 频谱学是一种光谱学.
- 光子学 是一个光子学.
背景情况:
- 干涉度近红外光谱学 (iNIRS) 用飞行时间 (TOF) 分辨率测量分散光场.
- 目前的iNIRS方法面临的挑战是信号与噪声比率 (SNR) 较低.
- 较长的波长提供了由于组织特性和安全性而改善SNR的潜力.
研究的目的:
- 为了评估iNIRS在1060nm的性能.
- 评估较长波长对SNR在TOF解析度测量的影响.
- 为了比较1060nm的SNR与更短的波长 (855nm和773nm) 的SNR.
主要方法:
- 采用了1060nm的干扰测近红外光谱法 (iNIRS).
- 用飞行时间 (TOF) 分辨率测量分散光场波动.
- 在特定的TOF范围 (800-1000 psi) 上,在额头位置分析了自相关SNR.
主要成果:
- 与855nm (3.7-9.3倍) 和773nm (6.0-33.5倍) 相比,在1060nm实现了显著的SNR改进.
- 在800-1000 ps的TOF中观察到的改善.
- 对物理系统参数和潜在的组织反应都有所改善.
结论:
- 波长大约在1060nm左右显示出增强iNIRS测量的前景.
- 较长的波长可以在TOF解决的斑点波动分析中潜在地克服SNR限制.
- 这种波长为更强大的 iNIRS 应用提供了途径.
相关概念视频
IR Spectrometers
1.0K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.0K
Infrared (IR) Spectroscopy: Overview
1.4K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
1.4K
IR Frequency Region: Fingerprint Region
666
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
666
IR Frequency Region: X–H Stretching
887
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of 2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
887
IR Spectrum
858
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
858
IR Spectroscopy: Molecular Vibration Overview
1.8K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
1.8K


