Heating sensation in patients with and without spinal fixation devices during MRI examination at different magnetic field strengths

Background Radiofrequency (RF) heating during MRI theoretically increases with magnetic field strength. In addition, implanted metallic devices are reported to further increase RF heating. However, a detailed evaluation of this type of heating remains scarce in clinical practice. Purpose To assess p...

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Bibliographic Details
Published in:Journal of magnetic resonance imaging 2019-02, Vol.49 (2), p.525-533
Main Authors: Yamaguchi, Taiki, Abe, Yuichiro, Ichino, Yoshio, Satoh, Shigenobu, Masuda, Takeshi, Kimura, Shoichi, Ito, Manabu, Yamamoto, Toru
Format: Article
Language:English
Subjects:
Adult
Aged
Female
Field strength
Fixation
Hot Temperature
Humans
lumbar spine
Lumbar Vertebrae - surgery
Magnetic Fields
Magnetic Resonance Imaging
Male
Medical imaging
metallic implant
Metals
Middle Aged
MRI safety
Patients
Prostheses and Implants
Radio frequency heating
Radio Waves
Retrospective Studies
RF heating
Spinal Fusion - methods
Spine
Spine (lumbar)
Statistical analysis
Statistical tests
Surveys and Questionnaires
Thermosensing
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Summary:Background Radiofrequency (RF) heating during MRI theoretically increases with magnetic field strength. In addition, implanted metallic devices are reported to further increase RF heating. However, a detailed evaluation of this type of heating remains scarce in clinical practice. Purpose To assess possible risks and discomfort related to RF heating during MRI examinations of patients with and without metallic implantable devices. Study Type A retrospective study of previous questionnaire results on the heating sensation during MRI examinations of the lumbar spine. Subjects In all, 715 patients, of whom 101 had implanted lumbar spine fixation devices. Field Strength/Sequence 1T and 3T/T1‐ and T2‐weighted imaging. Assessment The number of patients who perceived heating around the lumbar spine or other regions during the MRI examination. Statistical Tests A chi‐square test with respect to static field strength B0, presence of lumbar spine fixation devices, and duration of the MRI examination. Results The number of patients who perceived heating around the lumbar spine during the MRI examination significantly increased from 5.0% at 1T to 47.5% at 3T (P 
ISSN:1053-1807
1522-2586
DOI:10.1002/jmri.26307