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Fast bias-corrected conductivity mapping using stimulated echoes.

Santhosh Iyyakkunnel1,2, Matthias Weigel3,4,5,6, Oliver Bieri3,4

  • 1Division of Radiological Physics, Department of Radiology , University Hospital Basel, Basel, Switzerland. santhosh.iyyakkunnel@unibas.ch.

Magma (New York, N.Y.)
|August 6, 2024
PubMed
Summary
This summary is machine-generated.

A new Double Angle Stimulated Echo (DA-STE) method enables fast and accurate electrical properties tomography (EPT) using simultaneous complex magnitude and transceive phase measurements. This technique improves quantitative conductivity values, potentially making EPT clinically relevant.

Keywords:
B1 mappingConductivityEPTElectrical properties tomographySpin echoStimulated echo

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Imaging

Background:

  • Electrical Properties Tomography (EPT) is crucial for quantitative MRI.
  • Accurate EPT requires simultaneous complex magnitude and transceive phase information.
  • Existing methods often involve multiple acquisitions or approximations.

Purpose of the Study:

  • To introduce and validate a Double Angle Stimulated Echo (DA-STE) method for fast and accurate "full" Helmholtz-based EPT.
  • To demonstrate the potential of DA-STE for simultaneous magnitude and transceive phase measurement.
  • To assess the clinical relevance of DA-STE at 3 Tesla.

Main Methods:

  • Utilized a combination of spin and stimulated echoes for "full" EPT reconstruction.
  • Employed an interleaved 2D acquisition scheme for rapid data acquisition.
  • Validated the DA-STE method in a saline phantom and compared it with a Gradient Echo Double Angle (GRE-DAM) method, followed by in-vivo brain evaluation.

Main Results:

  • DA-STE demonstrated excellent agreement in magnitude compared to GRE-DAM.
  • Reconstructed conductivity values in the saline phantom aligned well with expectations.
  • In-vivo brain imaging yielded conductivity values consistent with literature data.

Conclusions:

  • The DA-STE method facilitates "full" Helmholtz-based EPT reconstruction without additional measurements.
  • Quantitative conductivity values are improved compared to phase-only EPT methods.
  • DA-STE is a rapid complex mapping technique with potential for clinical translation in 3T MRI.