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Assessment of the Cardiovascular System III: Palpation01:27

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Related Experiment Video

Updated: Jun 27, 2025

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb
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Quantitative Capillary Refill Time with image-based finger force estimation.

Takumi Nagasawa1, Kazuki Iwata1, Raquel Pantojo de Souza Bachour2

  • 1Department of Imaging Science, Graduate School of Science and Engineering, Chiba University, Chiba, 263-8522, Japan.

Medical Engineering & Physics
|May 1, 2024
PubMed
Summary

This study introduces a camera-based method for objective Capillary Refill Time (CRT) measurement. This technique quantifies skin color changes, aiding health status assessment for untrained individuals.

Keywords:
Capillary refill timeFinger compressionNail color changePigment component separationRgb camera

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Area of Science:

  • Biomedical Engineering
  • Medical Diagnostics
  • Optical Sensing

Background:

  • Skin color assessment is a simple, non-invasive health indicator.
  • Capillary Refill Time (CRT) is crucial for assessing patient health, particularly in emergencies.
  • Current CRT measurement is subjective and lacks standardization.

Purpose of the Study:

  • To develop a quantitative method for CRT measurement using an RGB camera.
  • To overcome the subjectivity inherent in traditional CRT assessments.
  • To enable objective health status evaluation through accessible technology.

Main Methods:

  • Utilized an RGB camera for skin color analysis during CRT measurement.
  • Implemented a finger compression technique on the forearm.
  • Calculated CRT based on observed post-compression skin color changes.
  • Estimated applied compression force by analyzing fingernail color variations.

Main Results:

  • Demonstrated a method for camera-based, quantitative CRT measurement.
  • Showcased the potential for objective assessment of circulatory status.
  • Provided a foundation for developing non-invasive diagnostic tools.

Conclusions:

  • Camera-based CRT measurement offers a promising objective alternative to subjective methods.
  • This approach can aid healthcare professionals and potentially be used by untrained individuals.
  • Further development can enhance the accuracy and applicability of this diagnostic technique.