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Abstract #3812

Real-world Performance of Clinical MRI Faraday Cages

James Matthew Small1, David Price1, Joe Martin1,2, Alan Wright1, Anthony Price1, Jane Ansell1,3, Elizabeth Stamou1, Ariona Kruezi1, Simon Shah1, Caitlin O'Brien1, Harriet Rogers1, Francesco Padormo1,4, and Geoff Charles-Edwards1
1Medical Physics and Clinical Engineering, Guy's & St. Thomas' NHS Foundation Trust, London, United Kingdom, 2MR Physics, St. Bartholomew's Hospital, London, United Kingdom, 3Neurology, King's College Hospital, London, United Kingdom, 4Hyperfine Inc., Guilford, CT, United States

Synopsis

Keywords: System Imperfections, Artifacts, Faraday cage, RF interference, RF noise

Motivation: There is a general lack of understanding of real-world MRI Faraday cage performance.

Goal(s): Survey the attenuation of Faraday cages when MR systems first become operational and assess how Faraday cage performance varies over time.

Approach: Faraday cage attenuation measurements were acquired as part of new MRI scanner acceptance testing & from existing MRI systems of varying ages between 1-15 years.

Results: The median Faraday cage attenuation at all locations at acceptance testing met the IEEE specification up to 128MHz, however 16/37 scanners had at least one measurement below 80dB at its’ resonant frequency.

Impact: This work shows that having an independent check of RF cage performance after scanner installation can be helpful if Faraday cage attenuation has been reduced during the installation process.

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Keywords