What can be demonstrated due to the induced electrical fields produced in patients by flowing blood and a static magnetic field?

The magnetohydrodynamic effect refers to the behavior of electrically conducting fluids, like blood, when they are influenced by a magnetic field. In the context of magnetic resonance imaging (MRI), the static magnetic field interacts with the flow of blood within the body, creating induced electrical fields. This phenomenon is essential in understanding how the body's movement and the magnetic field can interact, potentially leading to various effects.

Specifically, as blood flows through the magnetic field, the movement of charged particles generates small electrical currents due to the principle of electromagnetic induction. This can result in physiological effects on the body. In this case, the magnetohydrodynamic effect accounts for the movement of blood in the presence of a magnetic field and can lead to various sensations and reactions.

Other terms, like nystagmus and magnetophosphenes, may relate to sensations or visual disturbances experienced during an MRI due to the interaction of the magnetic field with the nervous system or the eye, but they do not directly describe the effects caused by the electrical fields induced in blood flow. Therefore, the magnetohydrodynamic effect is the most accurate choice that specifically relates to the electrokinetic phenomena arising from the interaction of blood flow within a magnetic field.