Volume 53, Issue 2 pp. 599-610
Original Research

Effect of Device Configuration and Patient's Body Composition on the RF Heating and Nonsusceptibility Artifact of Deep Brain Stimulation Implants During MRI at 1.5T and 3T

Bhumi Bhusal PhD

Bhumi Bhusal PhD

Department of Radiology, Northwestern University, Chicago, Illinois, USA

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Bach T. Nguyen PhD

Bach T. Nguyen PhD

Department of Radiology, Northwestern University, Chicago, Illinois, USA

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Pia P. Sanpitak BS

Pia P. Sanpitak BS

Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, USA

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Jasmine Vu BS

Jasmine Vu BS

Department of Radiology, Northwestern University, Chicago, Illinois, USA

Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, USA

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Behzad Elahi MD, PhD

Behzad Elahi MD, PhD

Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, Illinois, USA

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Joshua Rosenow MD

Joshua Rosenow MD

Department of Neurosurgery, Northwestern University, Chicago, Illinois, USA

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Mark J. Nolt PhD

Mark J. Nolt PhD

Department of Neurosurgery, Northwestern University, Chicago, Illinois, USA

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Roberto Lopez-Rosado PhD

Roberto Lopez-Rosado PhD

Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, Illinois, USA

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Julie Pilitsis MD, PhD

Julie Pilitsis MD, PhD

Department of Neurosciences and Experimental Therapeutics, Albany Medical College, Albany, New York, USA

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Marisa DiMarzio PhD

Marisa DiMarzio PhD

Department of Neurosciences and Experimental Therapeutics, Albany Medical College, Albany, New York, USA

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Laleh Golestanirad PhD

Corresponding Author

Laleh Golestanirad PhD

Department of Radiology, Northwestern University, Chicago, Illinois, USA

Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, USA

Address reprint requests to: L.G., Department of Radiology, Northwestern University, 737 N Michigan Ave, Suite 1600, Chicago, IL 60660, USA. E-mail: [email protected]

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First published: 28 August 2020
Citations: 22

Contract grant sponsor: NIH; Contract grant numbers: R00EB021320 and R03EB025344.

Abstract

Background

Patients with deep brain stimulation (DBS) implants have limited access to MRI due to safety concerns associated with RF-induced heating. Currently, MRI in these patients is allowed in 1.5T horizontal bore scanners utilizing pulse sequences with reduced power. However, the use of 3T MRI in such patients is increasingly reported based on limited safety assessments. Here we present the results of comprehensive RF heating measurements for two commercially available DBS systems during MRI at 1.5T and 3T.

Purpose

To assess the effect of imaging landmark, DBS lead configuration, and patient's body composition on RF heating of DBS leads during MRI at 1.5T and 3T.

Study Type

Phantom and ex vivo study.

Population/Subjects/Phantom/Specimen/Animal Model

Gel phantoms and cadaver brain.

Field Strength/Sequence

1.5T and 3T, T1-weighted turbo spin echo.

Assessment

RF heating was measured at the tips of DBS leads implanted in brain-mimicking gel. Image artifact was assessed in a cadaver brain implanted with an isolated DBS lead.

Statistical Tests

Descriptive.

Results

We observed substantial fluctuation in RF heating, mainly affected by phantom composition and DBS lead configuration, ranging from 0.14°C to 23.73°C at 1.5T, and from 0.10°C to 7.39°C at 3T. The presence of subcutaneous fat substantially altered RF heating at the electrode tips (3.06°C < ∆T < 19.05° C). Introducing concentric loops in the extracranial portion of the lead at the surgical burr hole reduced RF heating by up to 89% at 1.5T and up to 98% at 3T compared to worst-case heating scenarios.

Data Conclusion

Device configuration and patient's body composition substantially altered the RF heating of DBS leads during MRI. Interestingly, certain lead trajectories consistently reduced RF heating and image artifact.

Level of Evidence 1

Technical Efficacy Stage 1

J. MAGN. RESON. IMAGING 2021;53:599–610.

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