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On the RF safety of titanium mesh head implants in 7 T MRI systems: an investigation.

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Title: On the RF safety of titanium mesh head implants in 7 T MRI systems: an investigation.
Authors: Mustafa, Mazin1 (AUTHOR) musta132@umn.edu, Zulkarnain, Nur Izzati Huda1 (AUTHOR), Sadeghi‐Tarakameh, Alireza1 (AUTHOR), Grant, Andrea1 (AUTHOR), Darrow, David2 (AUTHOR), Ozutemiz, Can3 (AUTHOR), Eryaman, Yigitcan1 (AUTHOR)
Source: Magnetic Resonance in Medicine. Jul2025, Vol. 94 Issue 1, p414-423. 10p.
Subjects: Facial muscles, Simulation methods & models, Human anatomical models, Skull surgery, Temperature measurements
Abstract: Purpose: Patients undergoing craniofacial surgery for skull reconstruction may have titanium mesh implants. The safety risks related to 7 T MRI with these patients are not well understood. This study investigates the RF heating of titanium mesh head implants at 7 T. Methods: A simulation model for a 7 T birdcage head coil was developed and validated against B1+$$ \left|{B}_1^{+}\right| $$, 1 g‐averaged specific absorption rate (SAR), and temperature measurements in the presence of a titanium mesh. Various mesh sizes and shapes at different angular positions were simulated to determine the worst‐case scenario in a spherical phantom in addition to the effect of rounding the mesh edges. Full‐wave electromagnetic and bioheat thermal simulations were conducted on anatomical human models. Results: Preliminary results indicate an increase in the local SAR near the meshes depending on the shape, size, and location. The maximum absolute temperatures in the head were, on average, around 38.2°C after 15 min of RF power exposure, corresponding to 3.2 W/kg whole‐head SAR without a titanium mesh implant. The maximum absolute temperatures did not significantly change after introducing the titanium mesh implants, and the highest temperature was 38.4°C, observed near the cerebellum and the facial muscles. The maximum local increase in temperature was observed at the vicinity of the mesh as 2.8°C. Finally, it was shown that large mesh implants can negatively impact B1+$$ \left|{B}_1^{+}\right| $$ field. Conclusions: Small rounded titanium mesh head implants can be generally safe for 7 T MRI scans under the standard guidelines. Avoiding sharp corners and edges may reduce the chances of RF safety risks. [ABSTRACT FROM AUTHOR]
Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: On the RF safety of titanium mesh head implants in 7 T MRI systems: an investigation.
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  Data: <searchLink fieldCode="AR" term="%22Mustafa%2C+Mazin%22">Mustafa, Mazin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> musta132@umn.edu</i><br /><searchLink fieldCode="AR" term="%22Zulkarnain%2C+Nur+Izzati+Huda%22">Zulkarnain, Nur Izzati Huda</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sadeghi‐Tarakameh%2C+Alireza%22">Sadeghi‐Tarakameh, Alireza</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Grant%2C+Andrea%22">Grant, Andrea</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Darrow%2C+David%22">Darrow, David</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ozutemiz%2C+Can%22">Ozutemiz, Can</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Eryaman%2C+Yigitcan%22">Eryaman, Yigitcan</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Jul2025, Vol. 94 Issue 1, p414-423. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Facial+muscles%22">Facial muscles</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink><br /><searchLink fieldCode="DE" term="%22Human+anatomical+models%22">Human anatomical models</searchLink><br /><searchLink fieldCode="DE" term="%22Skull+surgery%22">Skull surgery</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Purpose: Patients undergoing craniofacial surgery for skull reconstruction may have titanium mesh implants. The safety risks related to 7 T MRI with these patients are not well understood. This study investigates the RF heating of titanium mesh head implants at 7 T. Methods: A simulation model for a 7 T birdcage head coil was developed and validated against B1+$$ \left|{B}_1^{+}\right| $$, 1 g‐averaged specific absorption rate (SAR), and temperature measurements in the presence of a titanium mesh. Various mesh sizes and shapes at different angular positions were simulated to determine the worst‐case scenario in a spherical phantom in addition to the effect of rounding the mesh edges. Full‐wave electromagnetic and bioheat thermal simulations were conducted on anatomical human models. Results: Preliminary results indicate an increase in the local SAR near the meshes depending on the shape, size, and location. The maximum absolute temperatures in the head were, on average, around 38.2°C after 15 min of RF power exposure, corresponding to 3.2 W/kg whole‐head SAR without a titanium mesh implant. The maximum absolute temperatures did not significantly change after introducing the titanium mesh implants, and the highest temperature was 38.4°C, observed near the cerebellum and the facial muscles. The maximum local increase in temperature was observed at the vicinity of the mesh as 2.8°C. Finally, it was shown that large mesh implants can negatively impact B1+$$ \left|{B}_1^{+}\right| $$ field. Conclusions: Small rounded titanium mesh head implants can be generally safe for 7 T MRI scans under the standard guidelines. Avoiding sharp corners and edges may reduce the chances of RF safety risks. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/mrm.30477
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        Text: English
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      – SubjectFull: Facial muscles
        Type: general
      – SubjectFull: Simulation methods & models
        Type: general
      – SubjectFull: Human anatomical models
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      – SubjectFull: Skull surgery
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      – SubjectFull: Temperature measurements
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      – TitleFull: On the RF safety of titanium mesh head implants in 7 T MRI systems: an investigation.
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            NameFull: Mustafa, Mazin
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            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
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