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Bias correction for phase-based cr-MREPT using low resolution B1+ magnitude.

Mustafa Kaan Çan¹, Yusuf Ziya Ider²

¹Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey.

Physics in Medicine and Biology

|June 3, 2024

Summary

This study introduces a new Magnetic Resonance Electrical Properties Tomography (MREPT) method to correct concave bias in conductivity imaging. The improved phase-based approach enhances image quality without significantly increasing scan time.

Keywords:

cr-MREPT phase-based MREPT resonance electrical properties tomography

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Area of Science:

Medical Imaging
Biophysics
Electrical Engineering

Background:

Full-form Magnetic Resonance Electrical Properties Tomography (MREPT) relies on B1+ magnitude and phase data.
Phase-based MREPT methods offer faster acquisition and higher SNR but are prone to concave bias.
This bias arises from neglecting the gradient of B1+ magnitude (∇|B1+|) within the region of interest.

Purpose of the Study:

To re-derive the core equation for phase-based MREPT without the simplifying assumption of negligible ∇|B1+|.
To propose and validate a novel correction method integrated directly into the MREPT equation system.

Main Methods:

Re-derivation of the phase-based MREPT central equation.
Integration of a correction for ∇|B1+| into the equation system.
Validation using both simulated and experimental MREPT data.

Main Results:

The proposed method effectively corrects the concave bias observed in phase-based MREPT.
Significant improvements in overall image quality were achieved.
The correction method utilizes a low-resolution |B1+| map, minimizing additional imaging time.

Conclusions:

The developed correction method enhances the accuracy of conductivity imaging in MREPT.
The approach offers a practical solution to overcome limitations of existing phase-based techniques.
The method can even use simulated |B1+| magnitude, eliminating the need for extra MREPT scans.