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Brain & Nervous System

Effects of W-CDMA 1950 MHz EMF emitted by mobile phones on regional cerebral blood flow in humans

No Effects Found

Mizuno Y, Moriguchi Y, Hikage T, Terao Y, Ohnishi T, Nojima T, Ugawa Y · 2009

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Thirty minutes of 3G phone radiation showed no measurable impact on brain blood flow in this small study of nine men.

Plain English Summary

Summary written for general audiences

Japanese researchers used brain scans to study whether 30 minutes of exposure to 3G mobile phone radiation (W-CDMA at 1950 MHz) affects blood flow in the brain. Testing nine healthy men with PET scans before, during, and after phone exposure, they found no significant changes in regional brain blood flow compared to fake exposure. This suggests that 3G phone radiation at typical usage levels doesn't measurably alter blood circulation in the brain.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.95 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.95 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: 1950 MHz Duration: 30 min

Study Details

This is the first study to investigate the effects of the third generation system on regional cerebral blood flow (rCBF) in humans.

We compared effects of the electromagnetic field (EMF) emitted from the Wideband Code Division Multi...

The subtraction analysis revealed no significant rCBF changes caused by the EMF conditions compared ...

Cite This Study
Mizuno Y, Moriguchi Y, Hikage T, Terao Y, Ohnishi T, Nojima T, Ugawa Y (2009). Effects of W-CDMA 1950 MHz EMF emitted by mobile phones on regional cerebral blood flow in humans Bioelectromagnetics.30(7):536-544,2009.
Show BibTeX
@article{y_2009_effects_of_wcdma_1950_3250,
  author = {Mizuno Y and Moriguchi Y and Hikage T and Terao Y and Ohnishi T and Nojima T and Ugawa Y},
  title = {Effects of W-CDMA 1950 MHz EMF emitted by mobile phones on regional cerebral blood flow in humans},
  year = {2009},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/19475648/},
}
PubMed: 19475648

Cited By (32 papers)

Quick Questions About This Study

No, a 2009 Japanese study found that 30 minutes of exposure to 3G phone radiation at 1950 MHz (W-CDMA) did not significantly change regional brain blood flow. PET scans of nine healthy men showed no measurable differences in brain circulation compared to fake exposure.
Research shows W-CDMA mobile phone signals don't alter brain blood circulation. A controlled study using PET brain scans found no significant changes in regional cerebral blood flow after 30 minutes of 1950 MHz exposure, suggesting typical phone usage doesn't affect brain circulation.
Researchers tested 1950 MHz phone radiation effects for 30 minutes in a 2009 study. They used PET scans to monitor brain blood flow before, during, and after this exposure period, finding no significant changes compared to sham exposure conditions.
Researchers used PET (positron emission tomography) scans to study 3G phone radiation effects on the brain. This advanced imaging technique allowed them to measure regional cerebral blood flow changes during 1950 MHz W-CDMA exposure with high precision.
Japanese researchers found no brain risks from third generation mobile phones in their 2009 study. PET scans of nine healthy men showed that 1950 MHz W-CDMA radiation didn't significantly affect regional brain blood flow during 30-minute exposure sessions.