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Numerical prediction of temperature elevation induced around metallic hip prostheses by traditional, split, and uniplanar gradient coils
Author(s) -
Zilberti Luca,
Bottauscio Oriano,
Chiampi Mario,
Hand Jeffrey,
Lopez Hector Sanchez,
Brühl Rüdiger,
Crozier Stuart
Publication year - 2015
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.25687
Subject(s) - duty cycle , temperature gradient , waveform , elevation (ballistics) , signal (programming language) , position (finance) , electromagnetic field , computer science , acoustics , materials science , mechanics , biomedical engineering , physics , mathematics , telecommunications , geometry , voltage , medicine , radar , finance , quantum mechanics , economics , programming language
Purpose The paper presents a computational study for the estimation of the temperature elevation occurring in a human subject carrying metallic hip prostheses when exposed to the magnetic field produced by gradient coils. Methods The simulations are performed through validated numerical codes, which solve the electromagnetic and thermal equations applied to a high‐resolution anatomical human model. Three different sets of gradient coils (traditional, split and uniplanar) are considered to evaluate the maximum steady‐state temperature elevation in the human body. This result is then rescaled to take into account the waveform of the signal, the duty‐cycle and the duration of the scan. Results Several exposure situations obtained by changing the patient's position are analyzed, finding temperature elevations on the order of some degrees. Conclusion The results are of possible concern and provide evidence of the need for further specific investigations aimed at assuring the safety of potential patients carrying metallic hip implants. Magn Reson Med 74:272–279, 2015. © 2014 Wiley Periodicals, Inc.