title: Assessment of radiofrequency self-heating around a metallic wire with MR T1-based thermometry.
abstract: Heat produced by a magnetic resonance (MR) imaging sequence in the vicinity of a conductive wire (pacemaker, electrodes, or catheter), is a subject of interest for the assessment of patient safety during imaging. For this purpose, the measurement of temperature rises during an MR imaging sequence using MR T1-based thermometry provides several advantages, mainly in its ability to retrieve in situ real-time thermal maps. Recent studies investigated the heat produced by an independent radiofrequency pulse, assessing MR imaging sequence heating using a specific MR thermometry sequence. This study focuses on self-heating for which the radiofrequency pulses used for measuring temperature create the heat. An experimental design was set up to evaluate T1-based thermometry self-heating using a coupled/decoupled wire and to compare it with a reference temperature gathered by an optical fiber device. For the tested experimental set up, T1-based thermometry is in fairly good agreement with optical fiber reference temperature.
authors.affiliation: Université de Lyon, CREATIS, UMR CNRS 5220, Inserm U 1044, Insa-Lyon, Villeurbanne, France. valerie.detti@creatis.univ-lyon1.fr
authors.forename: V
authors.initials: V
authors.lastname: Detti
authors.forename: D
authors.initials: D
authors.lastname: Grenier
authors.forename: E
authors.initials: E
authors.lastname: Perrin
authors.forename: O
authors.initials: O
authors.lastname: Beuf
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006358:Hot Temperature; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D008670:Metals / Q000528:radiation effects*; D019736:Prostheses and Implants; D011829:Radiation Dosage; D011846:Radio Waves; D013817:Thermography / Q000295:instrumentation*
chemical_list: D008670:Metals