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Related Concept Videos

The Electromagnetic Spectrum02:37

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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High-precision evaluation of electromagnetic tracking.

David Kügler1, Henry Krumb2, Judith Bredemann3

  • 1Department of Computer Science, Technischer Universität Darmstadt, Darmstadt, Germany. david.kuegler@gris.tu-darmstadt.de.

International Journal of Computer Assisted Radiology and Surgery
|April 15, 2019
PubMed
Summary
This summary is machine-generated.

A new evaluation protocol enhances electromagnetic tracking (EMT) accuracy for high-precision minimally invasive surgery (HP-MIS). This method significantly improves reliability and reduces patient risk in non-line-of-sight navigation scenarios.

Keywords:
Electromagnetic trackingEvaluation protocolHigh-precision surgeryLEGOphantomMetallic distortion compensation

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Area of Science:

  • Medical Engineering
  • Surgical Navigation Technologies
  • Biomedical Instrumentation

Background:

  • High-precision minimally invasive surgery (HP-MIS) requires accurate tracking, especially without a direct line of sight (LOS).
  • Current tracking technologies, including electromagnetic tracking (EMT), lack the necessary accuracy and robustness for HP-MIS navigation in LOS-absent scenarios.
  • Novel evaluation protocols are essential to ensure the high precision and reliability of EMT for HP-MIS.

Purpose of the Study:

  • To introduce a novel, high-accuracy protocol for evaluating electromagnetic tracking (EMT) measurements.
  • To address the limitations of existing evaluation methods for EMT in high-precision surgical navigation.
  • To improve the robustness and accuracy assessment of EMT systems for HP-MIS.

Main Methods:

  • Development of a high-accuracy phantom using LEGO, calibrated with a coordinate measuring machine.
  • Implementation of a protocol for evaluating relative sequential positions and estimating positioning uncertainty.
  • Application of a learned interpolation model to demonstrate the effects of distortion compensation.

Main Results:

  • The proposed protocol offers 5-10 times greater accuracy than previous methods for EMT errors of 0.2 mm.
  • Achieved 95% confidence margins of 0.02 mm, clarifying error and uncertainty properties for high-precision applications.
  • Demonstrated a 0.05 mm performance improvement in compensated EMT through the high-precision protocol.

Conclusions:

  • The novel protocol enhances the reliability of EMT evaluations by significantly reducing inherent uncertainties.
  • This advancement is crucial for reducing patient risk in HP-MIS and for evaluating magnetic field distortion compensation.
  • Further development and adoption of high-accuracy protocols are necessary for advancing EMT in HP-MIS.