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Magnetic Resonance Imaging

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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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

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Interventional device tracking under MRI via alternating current controlled inhomogeneities.

Dogangun Uzun^1,2, Dursun Korel Yildirim¹, Christopher G Bruce¹

¹Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA.

Magnetic Resonance in Medicine

|February 23, 2024

Summary

Researchers developed current-controlled, conductive ink-printed markers for enhanced MRI device tracking. These markers improve visibility of interventional devices across multiple MRI sequences by adjusting electrical current parameters.

Keywords:

blinking markers conductive ink printing current‐controlled MRI needle interventional MRI thin‐film RF antenna

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Last Updated: Jul 2, 2025

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Area of Science:

Medical Imaging
Materials Science
Electrical Engineering

Background:

Accurate tracking of interventional devices during Magnetic Resonance Imaging (MRI) is crucial for minimally invasive procedures.
Current methods for device visualization can be limited, especially with challenging imaging sequences.

Purpose of the Study:

To introduce an alternating current-controlled, conductive ink-printed marker for enhanced device tracking under MRI.
To evaluate the marker's implementation with custom and commercial interventional devices across gradient echo, balanced SSFP, and turbo spin-echo sequences.

Main Methods:

Solenoid coil markers were fabricated using conductive ink on heat shrink tubing.
Marker visibility was assessed by applying alternating and direct current, analyzing artifact size with varying current parameters (amplitude, frequency) across three MRI sequences.
An MR-compatible current supply circuit was developed and tested in vitro and in a postmortem animal model.

Main Results:

Optimal current direction and parameters were identified to maximize marker conspicuity for all tested MRI sequences.
Marker artifact size was successfully controlled by adjusting current amplitude.
Improved visibility of a custom 20-gauge nitinol needle was demonstrated in both in vitro and postmortem experiments.

Conclusions:

Current-controlled, conductive ink-printed markers offer a simple and effective solution for device tracking in MRI.
These markers are compatible with both custom and commercial MR-compatible interventional tools.
Adjusting applied current parameters, in conjunction with pulse sequence parameters and the developed current supply circuit, enables reliable MRI device tracking.