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Related Concept Videos

Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important. 
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
Pulse Oximetry01:24

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Related Experiment Video

Updated: Jun 2, 2026

Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
07:38

Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared

Published on: January 10, 2025

Spectral-profile-based algorithm for hemoglobin oxygen saturation determination from diffuse reflectance spectra.

Po-Ching Chen, Wei-Chiang Lin

    Biomedical Optics Express
    |May 12, 2011
    PubMed
    Summary
    This summary is machine-generated.

    A new algorithm estimates hemoglobin (Hb) oxygenation from spectral data, offering vital insights into tissue physiology. This method enhances medical research and clinical care by providing real-time Hb oxygenation monitoring.

    Keywords:
    (070.4790) Spectrum analysis(170.1610) Clinical applications(170.6510) Spectroscopy, tissue diagnostics(300.6550) Spectroscopy, visible

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    Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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    Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care

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    Last Updated: Jun 2, 2026

    Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
    07:38

    Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared

    Published on: January 10, 2025

    Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging
    07:06

    Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging

    Published on: May 7, 2017

    Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
    14:28

    Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care

    Published on: May 10, 2024

    Area of Science:

    • Biomedical Optics
    • Medical Physics
    • Physiological Monitoring

    Background:

    • Tissue hemoglobin (Hb) oxygenation variations are critical indicators of physiological status.
    • Accurate Hb oxygenation data is essential for medical research and clinical applications.
    • Current methods may have limitations in real-time, non-invasive tissue monitoring.

    Purpose of the Study:

    • To develop and validate a novel algorithm for estimating Hb oxygenation from diffuse reflectance spectra.
    • To leverage unique spectral differences between oxy-hemoglobin and deoxy-hemoglobin.
    • To enable real-time monitoring of tissue oxygenation saturation.

    Main Methods:

    • Developed an algorithm based on spectral profile differences of oxy-Hb and deoxy-Hb in the visible range.
    • Utilized differential wavelet transformation to quantify spectral features related to oxygenation.
    • Validated the algorithm using Monte Carlo simulations, tissue phantoms, and in vivo experiments.

    Main Results:

    • The algorithm accurately estimates Hb oxygenation saturation levels.
    • Demonstrated applicability across various tissue types with different scattering properties.
    • Confirmed clinical utility through successful in vivo data acquisition.

    Conclusions:

    • The derived algorithm provides a reliable method for Hb oxygenation estimation.
    • The technique is versatile and adaptable to different probe geometries for real-time monitoring.
    • This advancement holds significant potential for improving diagnostic and therapeutic strategies.