Investigation of Radio Frequency Heating of Dental Implants Made of Titanium in 1.5 Tesla and 3.0 Tesla Magnetic Resonance Procedure: Measurement of the Temperature by Using Tissue-equivalent Phantom

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  • Ideta Takahiro
    Department of Radiological Technology, Osaka City University Hospital
  • Yamazaki Masaru
    Department of Radiological Technology, Osaka City University Hospital
  • Kudou Sadahiro
    Department of Radiological Technology, Osaka City University Hospital
  • Higashida Mitsuji
    Department of Radiological Technology, Osaka City University Hospital
  • Mori Shintarou
    Department of Radiology, Nihon University School of Dentistry at Matsudo
  • Kaneda Takashi
    Department of Radiology, Nihon University School of Dentistry at Matsudo
  • Nakazawa Masami
    Department of Radiological Technology, Osaka City University Hospital Current address: Canon Lifecare Solutions lnc.

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Other Title
  • 1.5 Tおよび3.0 T-MRI検査における歯科用チタン(Ti)製インプラントのRF発熱に関する検討─人体等価ファントムを用いた温度測定─
  • 1.5Tおよび3.0T-MRI検査における歯科用チタン(Ti)製インプラントのRF発熱に関する検討 : 人体等価ファントムを用いた温度測定
  • 1.5T オヨビ 3.0T-MRI ケンサ ニ オケル シカヨウ チタン(Ti)セイ インプラント ノ RF ハツネツ ニ カンスル ケントウ : ジンタイ トウカ ファントム オ モチイタ オンド ソクテイ

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Titanium (Ti) implants are increasingly being used for dental parts. There is no problem with the attraction of a static magnetic field for Ti in magnetic resonance imaging (MRI), since Ti is paramagnetic. However, there is a risk of radio frequency (RF) heat generation within Ti. 3.0 T-MRI scanners are becoming increasingly common. The specific absorption rate (SAR) of 3.0 T-MRI is quadruple that of SAR compared with 1.5 T-MRI due to its being proportional to the square of the strength of a static magnetic field. The effect of heat generation in 3.0 T-MRI can thus be greater than in 1.5 T-MRI. So, using 1.5 T and 3.0 T-MRI scanners, we measured the temperature of several Ti implants using the same scanning parameters during MRI scanning. Our measurements showed the rise in temperature of the Ti implants to be a maximum of 0.4°C. In this study, however, Ti in a human mouth was not directly measured, so we need to attempt to perform MRI carefully on patients with Ti implants.

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