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Related Concept Videos

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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.
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Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

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High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...

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Related Experiment Video

Updated: Jul 10, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

Oximetry considerations in the small source detector separation limit.

Brian Winey1, Yan Yu

  • 1Dept. of Phys. & Astron., Rochester Univ., Rochester, NY 14642, USA. bwiney@pas.rochester.edu

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
Summary
This summary is machine-generated.

Visible wavelengths offer superior sensitivity for oximetry at small source-detector separations. This study highlights limitations of near-infrared (NIR) wavelengths in such scenarios, advocating for visible light for accurate blood oxygen saturation measurements.

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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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Real-Time Monitoring of Neurocritical Patients with Diffuse Optical Spectroscopies
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Related Experiment Videos

Last Updated: Jul 10, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
11:27

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

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Real-Time Monitoring of Neurocritical Patients with Diffuse Optical Spectroscopies
07:12

Real-Time Monitoring of Neurocritical Patients with Diffuse Optical Spectroscopies

Published on: November 19, 2020

Area of Science:

  • Biomedical Optics
  • Medical Instrumentation

Background:

  • Oximetry is crucial for assessing blood oxygen saturation and flow.
  • Current oximeters use near-infrared (NIR) wavelengths (650-1100 nm) for optical transmission.
  • Small source-detector separations (<1 mm) are increasingly used in tissue spectroscopy.

Purpose of the Study:

  • To demonstrate the limitations of current oximetry techniques at small source-detector separations.
  • To advocate for the use of visible wavelengths in oximetry under these conditions.
  • To theoretically and empirically show the benefits of visible wavelengths.

Main Methods:

  • Theoretical derivation of NIR wavelength limitations at small separations.
  • Monte Carlo simulations to model light transport.
  • In vivo data collection using a surface probe with <1 mm separation.

Main Results:

  • NIR wavelengths are insufficient for meaningful data at small source-detector separations due to limited scattering.
  • Visible wavelengths demonstrate over two orders of magnitude greater sensitivity to hemoglobin saturation changes.
  • Experimental data validates theoretical predictions and Monte Carlo simulations.

Conclusions:

  • Standard oximetry methods using NIR wavelengths are inadequate for small source-detector separations.
  • Visible wavelengths are essential for accurate oximetry in applications like catheter and surface probes.
  • This research necessitates a shift towards visible light oximetry for improved clinical measurements.