PMID: 15357196Sep 11, 2004Paper

A blood-oxygenation-dependent increase in blood viscosity due to a static magnetic field

Physics in Medicine and Biology
Toru YamamotoMamoru Tamura

Abstract

As the magnetic field of widely used MR scanners is one of the strongest magnetic fields to which people are exposed, the biological influence of the static magnetic field of MR scanners is of great concern. One magnetic interaction in biological subjects is the magnetic torque on the magnetic moment induced by biomagnetic substances. The red blood cell is a major biomagnetic substance, and the blood flow may be influenced by the magnetic field. However, the underlying mechanisms have been poorly understood. To examine the mechanisms of the magnetic influence on blood viscosity, we measured the time for blood to fall through a glass capillary inside and outside a 1.5 T MR scanner. Our in vitro results showed that the blood viscosity significantly increased in a 1.5 T MR scanner, and also clarified the mechanism of the interaction between red blood cells and the external magnetic field. Notably, the blood viscosity increased depending on blood oxygenation and the shear rate of the blood flow. Thus, our findings suggest that even a 1.5 T magnetic field may modulate blood flow.

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Citations

Jul 7, 2009·International Journal of Environmental Research and Public Health·Valentina HartwigSilvana Simi
Jan 24, 2014·Evidence-based Complementary and Alternative Medicine : ECAM·Shenzhi XuYoshito Ikada
Oct 31, 2007·Journal of Magnetic Resonance Imaging : JMRI·Atsuhito Toyomaki, Toru Yamamoto
Nov 23, 2012·Physiological Measurement·Broc A Burke, Solomon G Diamond
Jan 14, 2021·Biomedical Physics & Engineering Express·Bestoon T MustafaAsaad H Ismail

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