title: [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].
abstract: 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 degrees 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.
authors: Department of Radiological Technology, Osaka City University Hospital.
authors: Takahiro
authors: T
authors: Ideta
authors: Masaru
authors: M
authors: Yamazaki
authors: Sadahiro
authors: S
authors: Kudou
authors: Mitsuji
authors: M
authors: Higashida
authors: Shintarou
authors: S
authors: Mori
authors: Takashi
authors: T
authors: Kaneda
authors: Masami
authors: M
authors: Nakazawa
mesh_terms: D015921:Dental Implants; D006358:Hot Temperature; D006801:Humans; D008279:Magnetic Resonance Imaging; D019047:Phantoms, Imaging; D011846:Radio Waves; D013696:Temperature; D014025:Titanium
chemical_list: D015921:Dental Implants; D014025:Titanium