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Assessment of magnetic field interactions and heating for cerebral aneurysm flow diverters during 7T MRI

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Abstract

Flow diverters (FDs) are utilized for a wide range of aneurysms, but show safety issues such as adverse interactions with static magnetic fields (displacement force and torque) and radiofrequency-induced heating during magnetic resonance imaging (MRI). The present study aimed to assess these adverse interactions in a 7-tesla (7T) static magnetic field and radiofrequency-induced heating during a 7T MRI for two types of FD. Displacement force and magnetically induced torque were assessed using the deflection angle method and low friction surface method, respectively. To assess heating, each FD was set in a phantom filled with gelled-saline mixed with polyacrylic acid and underwent a 7T MRI using a three-dimensional fast spin echo method. Displacement force and magnetically induced torque in the 7T static magnetic field were undetectable, and radiofrequency-induced heating during 7T MRI remained ≤ 0.6 °C for both types of FD, suggesting that magnetic field interactions and heating on FDs during a 7T MRI are acceptable from a safety perspective.

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Data availability

The datasets generated or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

  1. Department of Neurosurgery, Iwate Medical University School of Medicine, 1-1, Idaidori 2-chome, Yahaba-cho, Shiwa-gun, Iwate, 028-3694, Japan

    Suguru Igarashi, Kohei Chida, Shota Tsutsui, Shunrou Fujiwara, Yoshitaka Kubo & Kuniaki Ogasawara

  2. Division of Ultra-high Field MRI, Institute for Biomedical Sciences, Iwate Medical University School of Medicine, 1-1, Idaidori 2-chome, Yahaba-cho, Shiwa-gun, Iwate, 028-3694, Japan

    Tsuyoshi Matsuda, Kota Takeda, Susumu Hayakawa & Makoto Sasaki

Authors
  1. Suguru Igarashi
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  2. Kohei Chida
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  3. Tsuyoshi Matsuda
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  4. Kota Takeda
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  5. Susumu Hayakawa
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  6. Shota Tsutsui
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  7. Shunrou Fujiwara
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  8. Yoshitaka Kubo
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  9. Makoto Sasaki
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  10. Kuniaki Ogasawara
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Corresponding author

Correspondence to Kohei Chida.

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Igarashi, S., Chida, K., Matsuda, T. et al. Assessment of magnetic field interactions and heating for cerebral aneurysm flow diverters during 7T MRI. Neuroradiology 65, 1809–1812 (2023). https://doi.org/10.1007/s00234-023-03208-8

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  • DOI: https://doi.org/10.1007/s00234-023-03208-8

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