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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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External Dynamic InTerference Estimation and Removal (EDITER) for low field MRI.

Sai Abitha Srinivas^1,2, Stephen F Cauley^3,4, Jason P Stockmann^3,4

¹Vanderbilt University Institute of Imaging Science, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine

|September 4, 2021

Summary

This summary is machine-generated.

Point-of-care MRI can now operate outside shielded rooms using the External Dynamic InTerference Estimation and Removal (EDITER) method. This technique removes electromagnetic interference (EMI) artifacts, improving image quality and enabling truly portable MRI systems.

Keywords:

accessible MRI active RF shielding low field MRI portable MRI

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Area of Science:

Medical Imaging
Biophysics
Electrical Engineering

Background:

Point-of-care MRI necessitates operation outside traditional Faraday cages, which are essential for blocking electromagnetic interference (EMI).
External EMI sources can degrade image quality in MRI systems, limiting their portability and application.
Developing methods to mitigate EMI is crucial for advancing mobile MRI technology.

Purpose of the Study:

To introduce the External Dynamic InTerference Estimation and Removal (EDITER) method for mitigating image artifacts caused by time-varying external EMI.
To enable the operation of MRI systems outside of shielded rooms.
To improve the feasibility of truly portable MRI.

Main Methods:

The EDITER method utilizes external sensors (tuned receive coils and untuned electrodes) to detect EMI simultaneously with MR data acquisition.
Impulse response functions are dynamically calculated to map detector data to time-varying artifacts.
The detected EMI is then retrospectively removed from the MR data.

Main Results:

In controlled phantom experiments, EDITER achieved up to 97% reduction in structured EMI and 76% in broadband EMI.
In uncontrolled in vivo experiments, EMI reductions of up to 99% were observed.
The method demonstrated up to a nine-fold improvement in image signal-to-noise ratio (SNR).

Conclusions:

The EDITER technique is a flexible and robust solution for enhancing image quality in portable MRI systems.
It significantly reduces the need for extensive passive shielding.
EDITER facilitates the development of truly portable MRI devices, expanding their clinical accessibility.