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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Quantification of direct current in electrically active implants using MRI methods.

Hanne Wojtczyk1, Hansjörg Graf, Petros Martirosian

  • 1Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Eberhard Karls University Tübingen, Hoppe-Seyler-Straße, Germany. hanne.wojtczyk@yahoo.de

Zeitschrift Fur Medizinische Physik
|February 1, 2011
PubMed
Summary
This summary is machine-generated.

Magnetic Resonance Imaging (MRI) methods can quantify electrical direct current (DC) by measuring induced magnetic field inhomogeneity. Phase-based MRI, particularly with FLASH sequences, shows higher sensitivity and accuracy for current measurement at 1.5 T and 3 T.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Electrical Engineering

Background:

  • Quantifying electrical direct current (DC) is crucial for medical devices and interventional procedures.
  • Magnetic Resonance Imaging (MRI) offers potential for non-invasive current measurement through induced magnetic field effects.

Purpose of the Study:

  • To evaluate the sensitivity and accuracy of various phase- and magnitude-based MRI methods for quantifying electrical DC.
  • To compare performance at different magnetic field strengths (1.5 T and 3 T).

Main Methods:

  • A specialized phantom was used to generate a 1D electrical DC perpendicular to the static magnetic field.
  • Phase-sensitive (FLASH) and magnitude-sensitive (trueFISP, MAGSUS, Spin Echo) MRI sequences were employed.
  • Electrical currents ranging from 4 mA to 472 mA were analyzed.

Main Results:

  • MRI current quantification accuracy varied by method and field strength, with mean absolute deviations between 9% and 21%.
  • FLASH phase imaging demonstrated superior sensitivity compared to trueFISP and MAGSUS.
  • Artifact extension in FLASH magnitude and Spin Echo images correlated with increasing electrical current.

Conclusions:

  • MRI techniques show promise for functional testing of active medical devices and visualizing instruments during interventional procedures.
  • Distinct artifacts can be generated by currents below 100 mA under ideal conditions, enabling potential applications.