In this paper radiofrequency power absorption and temperature elevation in the thorax of a pacemaker (PM) holder exposed to the field generated by a 1.5 T (64 MHz) magnetic resonance imaging (MRI) apparatus have been numerically studied. A pacemaker model, constituted by a metallic box equipped with a catheter, has been inserted inside an anatomical body model that is placed inside the birdcage MRI antenna. The results obtained for an input power of 60 W (typical value for MRI examinations) show that SAR safety limits proposed in international guidelines are met, while temperature increments are well above the prescribed recommendations. In particular, by neglecting the blood perfusion, temperature increments up to 30 degrees C are computed at the catheter tip; these reduce to about 10 degrees C if a complete thermal model is considered, still remaining over safety limits.

Safety Aspects of Magnetic Resonance Imaging for Pacemaker Holders / Bernardi, Paolo Italo; Cavagnaro, Marta; Pisa, Stefano; Piuzzi, Emanuele. - (2009), pp. 869-872. (Intervento presentato al convegno International Conference on Electromagnetics in Advanced Applications (ICEAA 2009) tenutosi a Torino, ITALY nel SEP 14-18, 2009) [10.1109/iceaa.2009.5297353].

Safety Aspects of Magnetic Resonance Imaging for Pacemaker Holders

BERNARDI, Paolo Italo;CAVAGNARO, Marta;PISA, Stefano;PIUZZI, Emanuele
2009

Abstract

In this paper radiofrequency power absorption and temperature elevation in the thorax of a pacemaker (PM) holder exposed to the field generated by a 1.5 T (64 MHz) magnetic resonance imaging (MRI) apparatus have been numerically studied. A pacemaker model, constituted by a metallic box equipped with a catheter, has been inserted inside an anatomical body model that is placed inside the birdcage MRI antenna. The results obtained for an input power of 60 W (typical value for MRI examinations) show that SAR safety limits proposed in international guidelines are met, while temperature increments are well above the prescribed recommendations. In particular, by neglecting the blood perfusion, temperature increments up to 30 degrees C are computed at the catheter tip; these reduce to about 10 degrees C if a complete thermal model is considered, still remaining over safety limits.
2009
International Conference on Electromagnetics in Advanced Applications (ICEAA 2009)
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Safety Aspects of Magnetic Resonance Imaging for Pacemaker Holders / Bernardi, Paolo Italo; Cavagnaro, Marta; Pisa, Stefano; Piuzzi, Emanuele. - (2009), pp. 869-872. (Intervento presentato al convegno International Conference on Electromagnetics in Advanced Applications (ICEAA 2009) tenutosi a Torino, ITALY nel SEP 14-18, 2009) [10.1109/iceaa.2009.5297353].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/224325
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