Target-specific rCBF changes induced by 0.3-T static magnetic field exposure on the brain

Area of Science:

• Neuroscience
• Medical Physics

Background:

• The effects of magnetic fields on the human brain are debated, with potential applications like transcranial magnetic stimulation (TMS) but uncertain outcomes.
• Understanding magnetic field interactions with brain physiology is crucial for both safety and therapeutic development.

Purpose of the Study:

• To investigate the impact of a 0.3-Tesla (T) static magnetic field on regional cerebral blood flow (rCBF) in healthy human subjects.
• To determine if localized static magnetic field exposure alters blood flow in targeted and non-targeted brain regions.

Main Methods:

• 14 healthy subjects underwent perfusion SPECT scans using Tc-99m ECD.
• A 0.3-T static magnetic field was applied to the right frontotemporal region.
• rCBF patterns were compared between static magnetic field exposure, resting, and sham conditions.

Main Results:

• Significant increase in rCBF observed in the right frontal, right parietal, and right insula regions.
• A notable decrease in rCBF was found in the contralateral left frontal and left parietal regions (P<0.05).
• The findings suggest a localized, non-invasive alteration of cerebral blood flow by the static magnetic field.

Conclusions:

• A 0.3-T static magnetic field can non-invasively increase rCBF in targeted brain areas.
• The observed increase in targeted regions may be associated with decreased rCBF in contralateral areas.
• These results provide foundational insights into the physiological effects of static magnetic fields on the brain.