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Updated: Feb 17, 2026

Clinical Imaging of Microwave Mammography
05:28

Clinical Imaging of Microwave Mammography

Published on: November 14, 2025

285

In vitro artifact assessment of an MR-compatible, microwave antenna device for percutaneous tumor ablation with

David-Emanuel Kessler1, Jakob Weiss1, Hansjörg Rempp1

  • 1a Department of Diagnostic and Interventional Radiology , Eberhard Karls University , Tuebingen , Germany.

Minimally Invasive Therapy & Allied Technologies : MITAT : Official Journal of the Society for Minimally Invasive Therapy
|December 13, 2017
PubMed
Abstract

Insights

This study shows that magnetic resonance (MR)-compatible microwave (MW) applicators produce acceptable artifacts and tip location errors for safe positioning during MR-guided percutaneous tumor ablation. Near-realtime MR-fluoroscopic sequences are effective for evaluating these applicators.

Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Biomedical Engineering

Background:

  • Percutaneous tumor ablation relies on accurate applicator placement.
  • Magnetic resonance (MR)-compatible microwave (MW) applicators offer potential for image-guided procedures.
  • Evaluating applicator artifact configuration and diameters is crucial for safe and effective MR-guided interventions.

Purpose of the Study:

  • To assess the artifact characteristics and diameters of MR-compatible MW applicators.
  • To evaluate the impact of applicator orientation and imaging parameters on artifact formation.
  • To determine the Tip Location Error (TLE) for precise applicator positioning during MR-guided ablation.

Main Methods:

  • Two MW applicators (14G and 16G) were tested in an ex-vivo phantom at 1.5T.
  • Near-realtime 3D fluoroscopic MR sequences (GRE and SSFP) were utilized.
  • Applicator orientation, slice orientation, and phase encoding direction were systematically varied and analyzed using ANOVA.

Main Results:

  • Artifacts were consistently homogenous along both applicator lengths across all tested parameters.
  • The 16G applicator showed a tip artifact diameter of 6.9 ± 1.0 mm and shaft artifact diameter of 8.6 ± 1.2 mm, with a TLE of 1.5 ± 1.2 mm.
  • The 14G applicator exhibited a tip artifact diameter of 7.7 ± 1.2 mm and shaft artifact diameter of 9.6 ± 1.5 mm, with a TLE of 1.6 ± 1.2 mm. GRE sequences slightly overestimated antenna length.

Conclusions:

  • The MR-compatible MW applicator demonstrates acceptable artifact configuration and Tip Location Error (TLE).
  • These findings support the safe positioning of MW applicators under near-realtime fluoroscopic MR-guidance for percutaneous tumor ablation.
  • The study validates the utility of MR-fluoroscopic sequences for evaluating applicator performance in MR-guided procedures.
Keywords:
MR-fluoroscopyMR-guidanceMicrowave ablationthermal ablation

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