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Conductivity and permittivity imaging at 3.0T.

S B Bulumulla¹, S K Lee, D T B Yeo

¹GE Global Research, Niskayuna, NY.

Concepts in Magnetic Resonance. Part B, Magnetic Resonance Engineering

|April 20, 2013

Summary

This summary is machine-generated.

This study presents a new method for imaging tissue electrical properties, conductivity, and permittivity using magnetic resonance imaging (MRI) transmit field maps. This technique can help in MRI safety and cancer diagnosis.

Keywords:

Hyperthermia Magnetic resonance imaging Oncology Tissue conductivity Tissue permittivity

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Area of Science:

Biomedical Engineering
Medical Imaging Physics
Electromagnetics

Background:

Tissue electrical properties (conductivity, permittivity) are crucial for understanding radio frequency (RF) power deposition in magnetic resonance imaging (MRI).
These properties are vital for RF thermotherapy planning and may serve as diagnostic markers, with malignant tissues exhibiting higher conductivity and permittivity.
Accurate measurement of these properties is essential for both MRI safety and potential diagnostic applications.

Purpose of the Study:

To develop and validate efficient methods for imaging tissue conductivity and permittivity using MRI transmit field maps (B₁⁺ maps) at 3.0 Tesla.
To demonstrate the capability of these methods in identifying variations in electrical properties within tissues.

Main Methods:

Formulated efficient methods to calculate conductivity and relative permittivity from 2D B₁⁺ data.
Validated the methods using simulated B₁⁺ maps generated at 128 MHz.
Acquired B₁⁺ maps at 3.0 Tesla using the Bloch-Siegert shift B₁⁺ mapping technique.

Main Results:

Successfully demonstrated the calculation of conductivity and relative permittivity from B₁⁺ maps.
Validated the accuracy of the developed methods through simulations.
Generated images of conductivity and relative permittivity at 3.0 Tesla that effectively show contrast in electrical properties.

Conclusions:

The developed methods enable efficient imaging of tissue conductivity and permittivity using MRI B₁⁺ maps.
This technique shows promise for improving MRI safety, treatment planning in RF thermotherapy, and potentially aiding in cancer diagnosis by identifying differences in tissue electrical properties.