Abstract
The movement of a conducting fluid, such as the blood, in an externally applied magnetic field, B0, is governed by the laws of magnetohydrodynamics. When the body is subjected to a magnetic field, as it is the case in magnetic resonance imaging (MRI), the charged particles of the blood flowing transversally to the field get deflected by the Lorentz force thus inducing electrical currents and voltages across the vessel walls and in the surrounding tissues, strong enough to be detected at the surface of the thorax in the electrocardiogram. Moreover, the interactions between these induced currents and the applied magnetic field can cause a reduction of flow rate and thus a reactive compensatory increase in blood pressure in order to retain a constant volume flow rate [Tenforde, 2005].
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