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A liver-mimicking MRI phantom for thermal ablation experiments.

Babak Bazrafshan1, Frank Hübner, Parviz Farshid

  • 1Department of Diagnostic and Interventional Radiology, Hospital of the J. W. Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.

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|July 23, 2011
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Summary

A novel MRI gel phantom mimicking liver tissue was developed for thermal ablation tool development. This heat-resistant, MR-compatible phantom enables real-time monitoring and control of liver tumor ablation procedures.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Materials Science

Background:

  • Thermal ablation methods like laser-induced interstitial thermotherapy (LITT) and radiofrequency ablation (RFA) require precise tools for temperature mapping and coagulation monitoring.
  • Developing accurate phantoms that mimic biological tissue properties is crucial for advancing these tools.

Purpose of the Study:

  • To create a liver-mimicking MRI gel phantom.
  • To facilitate the development of tools for real-time monitoring and control during thermal tumor ablation procedures.

Main Methods:

  • A gel phantom was formulated using acrylamide, bovine hemoglobin, and MRI contrast agents (Magnevist and Lumirem).
  • Optical absorption and MR relaxation times (T1 and T2) were measured across various temperatures and component concentrations.
  • Phantom properties were optimized to match ex vivo porcine liver values.
  • Heat resistance was tested using LITT.

Main Results:

  • The gel phantom exhibited properties comparable to liver tissue, with specific concentrations of hemoglobin (3.92%) and contrast agents (T1: 0.098%, T2: 2.980%).
  • Phantom T1 and T2 relaxation times closely matched liver values over a temperature range of 25-75°C.
  • The phantom demonstrated excellent heat resistance, with no melting observed after LITT treatment up to 120°C.

Conclusions:

  • The developed gel phantom is heat-resistant and MR-compatible.
  • It serves as a viable alternative to liver tissue for MR-guided thermal ablation experiments.
  • The phantom supports the development of clinical tools for real-time monitoring and control in liver thermal ablation.