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Related Concept Videos

Pulse01:16

Pulse

2.2K
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

4.1K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.8K
Pulse Oximetry01:24

Pulse Oximetry

1.4K
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...
1.4K
Regulation of Pulse01:20

Regulation of Pulse

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Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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Updated: Feb 8, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Precise Detection of Wrist Pulse Using Digital Speckle Pattern Interferometry.

Hengfei Zhang1, Sijin Wu1, Weixian Li1

  • 1School of Instrumentation Science and Opto-Electronics Engineering, Beijing Information Science and Technology University, Beijing 100192, China.

Evidence-Based Complementary and Alternative Medicine : Ecam
|July 10, 2018
PubMed
Summary
This summary is machine-generated.

Traditional Chinese medicine pulse diagnosis lacks objective methods. This study introduces a noncontact optical technique using spatial-carrier digital speckle pattern interferometry (DSPI) for precise wrist pulse measurement.

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Area of Science:

  • Biomedical optics
  • Traditional Chinese Medicine (TCM)
  • Medical diagnostics

Background:

  • Pulse diagnosis is a core component of Traditional Chinese Medicine (TCM).
  • Current methods for pulse diagnosis lack objective and efficient detection techniques.
  • Accurate measurement of pulse characteristics is crucial for TCM diagnosis.

Purpose of the Study:

  • To develop a noncontact optical method for precise wrist pulse detection.
  • To determine the temporal and spatial distributions of arterial pulsation.
  • To provide an objective and efficient alternative to traditional pulse diagnosis methods.

Main Methods:

  • Utilized spatial-carrier digital speckle pattern interferometry (DSPI) for noncontact measurement.
  • Measured micro/nanoscale skin displacement dynamically.
  • Adapted DSPI to capture comprehensive arterial pulsation information at Cun, Guan, and Chi locations.

Main Results:

  • Successfully obtained spatiotemporal distributions of the human wrist pulse.
  • Demonstrated the capability of DSPI to measure dynamic skin displacement.
  • Validated the method's potential for detailed pulse analysis.

Conclusions:

  • The proposed noncontact optical DSPI method enables accurate spatiotemporal pulse analysis.
  • This technique can provide comprehensive data for describing various pulse parameters.
  • Offers a promising objective approach for TCM pulse diagnosis.