Vertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systems

Ehsan Kazemivalipour, Bhumi Bhusal, Jasmine Vu, Stella Lin, Bach Thanh Nguyen, John Kirsch, Elizabeth Nowac, Julie Pilitsis, Joshua Rosenow, Ergin Atalar, Laleh Golestanirad*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Purpose: Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due to safety concerns associated with the radiofrequency (RF) heating of their electrodes. The majority of studies on RF heating of conductive implants have been performed in horizontal close-bore MRI scanners. Vertical MRI scanners which have a 90° rotated transmit coil generate fundamentally different electric and magnetic field distributions, yet very little is known about RF heating of implants in this class of scanners. We performed numerical simulations as well as phantom experiments to compare RF heating of DBS implants in a 1.2T vertical scanner (OASIS, Hitachi) compared to a 1.5T horizontal scanner (Aera, Siemens). Methods: Simulations were performed on 90 lead models created from post-operative CT images of patients with DBS implants. Experiments were performed with wires and commercial DBS devices implanted in an anthropomorphic phantom. Results: We found significant reduction of 0.1 g-averaged specific absorption rate (30-fold, P < 1 × 10−5) and RF heating (9-fold, P <.026) in the 1.2T vertical scanner compared to the 1.5T conventional scanner. Conclusion: Vertical MRI scanners appear to generate lower RF heating around DBS leads, providing potentially heightened safety or the flexibility to use sequences with higher power levels than on conventional systems.

Original languageEnglish (US)
Pages (from-to)1560-1572
Number of pages13
JournalMagnetic resonance in medicine
Volume86
Issue number3
DOIs
StatePublished - Sep 2021

Keywords

  • MR-guided neurosurgery
  • MRI safety
  • RF heating
  • deep brain stimulation
  • finite element method
  • medical implants
  • open-bore vertical MRI

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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