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Related Experiment Video

Updated: May 26, 2026

Use of Electromagnetic Navigational Transthoracic Needle Aspiration (E-TTNA) for Sampling of Lung Nodules
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Freehand biopsy guided by electromagnetic needle tracking: a phantom study.

C Ewertsen1, K Rue Nielsen, M Bachmann Nielsen

  • 1Department of Radiology, Copenhagen University Hospital, Rigshospitalet, Denmark. caroline.ewertsen@dadlnet.dk

Ultraschall in Der Medizin (Stuttgart, Germany : 1980)
|December 7, 2011
PubMed
Summary

Electromagnetic needle tracking offers comparable accuracy to standard ultrasound-guided biopsy methods. This technology also enables off-plane biopsies, expanding procedural capabilities.

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Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Biopsy Techniques

Background:

  • Ultrasound-guided biopsy is a common minimally invasive procedure.
  • Electromagnetic needle tracking offers real-time guidance for biopsies.
  • Evaluating new navigation technologies is crucial for improving procedural outcomes.

Purpose of the Study:

  • To compare the accuracy and time efficiency of electromagnetic needle tracking-guided biopsy with standard ultrasound-guided biopsy.
  • To assess the feasibility of performing off-plane biopsies using electromagnetic needle tracking.

Main Methods:

  • Three biopsy series were performed in a phantom: standard ultrasound-guided, in-plane electromagnetic needle tracking, and off-plane electromagnetic needle tracking.
  • Biopsies targeted 1 cm spheres filled with red dye.

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Last Updated: May 26, 2026

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  • Each attempt to perforate the phantom surface was recorded.

    • Main Results:

    • No statistically significant difference in success rates was observed between the methods (88% in-plane guided, 87% in-plane tracking, 92% off-plane tracking).
    • Mean biopsy times were 19.9s (standard), 34.1s (in-plane tracking), and 34.4s (off-plane tracking).
    • Electromagnetic needle tracking demonstrated comparable accuracy to conventional methods.

    Conclusions:

    • Electromagnetic needle navigation is a valuable tool for image-guided biopsy, achieving success rates similar to conventional techniques.
    • This technology facilitates off-plane image-guided biopsies, offering procedural flexibility.
    • Needle navigation systems hold promise for enhancing image-guided interventions.