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This effect is an additional electrical charge generated by ions in blood (loaded particles) moving perpendicular to the magnetic field.
At 1.5 T, no significant changes are expected; at 6.0 T a 10% blood pressure change is expected.
A blood pressure increase is predicted theoretically for a field of 10 T. This is claimed to be caused by interaction of induced electrical potentials and currents within a solution, e.g. blood, and an electrical volume force causing a retardation in the direction opposite to the fluid flow. This decrease in blood flow-velocity must be compensated for by an elevation in pressure.
Static magnetic field gradients of 0.01 T/cm (100 G/cm) make no significant difference in the membrane transport processes. The influence of a static magnetic field upon erythrocytes is not sufficient to provoke sedimentation, as long as there is a normal blood circulation.
The magnetohydrodynamic effect which results from a voltage occurring across a vessel in a magnetic field, is irrelevant at the field strengths used. | |
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| • For this and other aspects of MRI safety see our InfoSheet about MRI Safety. | |
| • Patient-related information is collected in our MRI Patient Information.
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