Abstract #1215

Reduction of Radiofrequency Induced Heating around Passive Implants via Flexible Metasurface Shielding at 7T

Paul S Jacobs¹, Neil E Wilson¹, Wyger M Brink², Anshuman Swain¹, Aniketh Hanumapur¹, Neeraj Panchal³, Samir Mehta⁴, Mark A Elliott¹, and Ravinder Reddy¹

¹Center for Advanced Metabolic Imaging in Precision Medicine, Department of Radiology, University of Pennsylvania, Philadelphia, PA, United States, ²Magnetic Detection and Imaging group, TechMed Centre, University of Twente, Enschede, Netherlands, ³Department of Oral and Maxillofacial Surgery, University of Pennsylvania, Philadelphia, PA, United States, ⁴Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, PA, United States

Synopsis

Keywords: Safety, Safety

Motivation: Metallic implant compatibility at ultra-high field strengths (≥7T) continues to be often contraindicated as RF induced heating can result in surrounding tissue damage. Metasurface technology has been shown in the past to locally null the B₁⁺ field, thereby providing a potential solution for shielding implants.

Goal(s): To demonstrate a metasurface based method for shielding metallic implants to reduce RF heating.

Approach: Eight implants were tested in a polyacrylic acid (PAA) phantom using a high-SAR sequence with and without a prototype metasurface.

Results: On average the metasurface design reduced RF induced implant heating in the phantom by 41.6%.

Impact: Patient undergoing invasive brain or trauma surgeries typically have passive metallic devices placed, making them unable to receive MRI scans at ultra-high field strengths due to RF induced heating. This work benefits this patient population by reducing RF heating.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.