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Abstract #1788

Maximum DB/dt & Switching Noise in 1.5T MRI Scanners for Safety Evaluation of Active Implantable Medical Device

Neha Bharat Butala1, Ramez Emile Necola Shehada1, Peter Nabil Costandi1, Ali Dianaty1, Kevin Jurkowski1

1Cardiac Rhythm Management Division, St. Jude Medical, Sylmar, CA, United States

Active implantable medical devices (AIMD) in patients undergoing MRI, present a risk of tissue stimulation at gradient dB/dt rates lower than the imposed limits for direct stimulation. Additionally, the gradient amplifier noise, ripple could interfere with AIMD, compromising safety. The dB/dt and associated ripple were investigated in 1.5T MRI scanners. A total of 126 measurements were performed using Faraday coils in various scanners and bore locations, while running different clinical sequences. The magnitude and location of maximum dB/dt and ripple was identified. This information may be valuable for assessment of unintended gradient stimulation hazard to demonstrate MR compatibility of AIMD.