ArticleAJNR. American journal of neuroradiology2022
Assessment of Heating on Titanium Alloy Cerebral Aneurysm Clips during 7T MRI.
Article in AJNR. American journal of neuroradiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 7 citations in OpenAlex.
- Reduction of radiofrequency induced implant heating via flexible metasurface shielding at 7 T.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2025Article
- On the RF safety of titanium mesh head implants in 7 T MRI systems: an investigation.Magnetic resonance in medicine · 2025Article
- In vivoMagnetic resonance in medicine · 2024Article
- Assessment of magnetic field interactions and heating for cerebral aneurysm flow diverters during 7T MRI.Neuroradiology · 2023Article
- Radiofrequency induced heating of biodegradable orthopaedic screw implants during magnetic resonance imaging.Bioactive materials · 2023Article
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Authors and funding
9 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
background and purposePatients with cerebral aneurysms often undergo MR imaging after microsurgical clipping. Ultra-high-field MR imaging at 7T may provide high diagnostic capability in such clinical situations. However, titanium alloy clips have safety issues such as adverse interactions with static magnetic fields and radiofrequency-induced heating during 7T MR imaging. The purpose of this study was to quantitatively assess temperature increases on various types of titanium alloy aneurysm clips during 7T MR imaging. MATERIALS AND
methodsFive types of titanium alloy aneurysm clips were tested, including combinations of short, long, straight, angled, and fenestrated types. Each clip was set in a phantom filled with gelled saline mixed with polyacrylic acid and underwent 7T MR imaging with 3D T1WI with a spoiled gradient recalled acquisition in the steady-state technique. Temperature was chronologically measured at the tips of the clip blade and head, angled part of the clip, and 5 mm from the tip of the clip head using MR imaging-compatible fiber-optic thermometers.
resultsTemperature increases at all locations for right-angled and short straight clips were <1°C. Temperature increases at the angled part for the 45° angled clip and the tip of the clip head for the straight fenestrated clip were >1°C. Temperature increases at all locations for the long straight clip were >2°C.
conclusionsTemperature increases on the right-angled and short straight clips remained below the regulatory limit during 7T MR imaging, but temperature increases on the 45° angled, straight fenestrated, and long straight clips exceeded this limit.
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