Browsing by Author "Rinne, Juha O"
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- ItemEffects of a 902 MHz mobile phone on cerebral blood flow in humans: a PET study.(2003-11-05) Haarala, Christian; Aalto, Sargo; Hautzel, Hubertus; Julkunen, Laura; Rinne, Juha O; Laine, Matti; Krause, Bernd; Hämäläinen, HeikkiFourteen healthy right handed subjects were scanned using PET with a 15O water tracer during exposure to electromagnetic field EMF emitted by a mobile phone and a sham exposure under double blind conditions During scanning the subjects performed a visual working memory task Exposure to an active mobile phone produced a relative decrease in regional cerebral blood flow rCBF bilaterally in the auditory cortex but no rCBF changes were observed in the area of maximum EMF It is possible that these remote findings were caused by the EMF emitted by the active mobile phone A more likely interpretation of the present findings were a result of an auditory signal from the active mobile phone Therefore it is not reasoned to attribute this finding to the EMF emitted by the phone Further study on human rCBF during exposure to EMF of a mobile phone is needed
- ItemGSM mobile phone radiation suppresses brain glucose metabolism.(2011-12-01) Kwon, Myoung Soo; Vorobyev, Victor; Kännälä, Sami; Laine, Matti; Rinne, Juha O; Toivonen, Tommi; Johansson, Jarkko; Teräs, Mika; Lindholm, Harri; Alanko, Tommi; Hämäläinen, HeikkiWe investigated the effects of mobile phone radiation on cerebral glucose metabolism using high resolution positron emission tomography PET with the 18 F deoxyglucose FDG tracer A long half life 109 minutes of the 18 F isotope allowed a long natural exposure condition outside the PET scanner Thirteen young right handed male subjects were exposed to a pulse modulated 902 4 MHz Global System for Mobile Communications signal for 33 minutes while performing a simple visual vigilance task Temperature was also measured in the head region forehead eyes cheeks ear canals during exposure 18 F deoxyglucose PET images acquired after the exposure showed that relative cerebral metabolic rate of glucose was significantly reduced in the temporoparietal junction and anterior temporal lobe of the right hemisphere ipsilateral to the exposure Temperature rise was also observed on the exposed side of the head but the magnitude was very small The exposure did not affect task performance reaction time error rate Our results show that short term mobile phone exposure can locally suppress brain energy metabolism in humans
- ItemMobile phone affects cerebral blood flow in humans.(2006-06-22) Aalto, Sargo; Haarala, Christian; Brück, Anna; Sipilä, Hannu; Hämäläinen, Heikki; Rinne, Juha OMobile phones create a radio frequency electromagnetic field EMF around them when in use the effects of which on brain physiology in humans are not well known We studied the effects of a commercial mobile phone on regional cerebral blood flow rCBF in healthy humans using positron emission tomography PET imaging Positron emission tomography data was acquired using a double blind counterbalanced study design with 12 male subjects performing a computer controlled verbal working memory task letter 1 back Explorative and objective voxel based statistical analysis revealed that a mobile phone in operation induces a local decrease in rCBF beneath the antenna in the inferior temporal cortex and an increase more distantly in the prefrontal cortex Our results provide the first evidence suggesting that the EMF emitted by a commercial mobile phone affects rCBF in humans These results are consistent with the postulation that EMF induces changes in neuronal activity
- ItemNo effects of short-term GSM mobile phone radiation on cerebral blood flow measured using positron emission tomography.(2012-03-05) Kwon, Myoung Soo; Vorobyev, Victor; Kännälä, Sami; Laine, Matti; Rinne, Juha O; Toivonen, Tommi; Johansson, Jarkko; Teräs, Mika; Joutsa, Juho; Tuominen, Lauri; Lindholm, Harri; Alanko, Tommi; Hämäläinen, HeikkiThe present study investigated the effects of 902 4 MHz global system for mobile communications GSM mobile phone radiation on cerebral blood flow using positron emission tomography PET with the 15 O water tracer Fifteen young healthy right handed male subjects were exposed to phone radiation from three different locations left ear right ear forehead and to sham exposure to test for possible exposure effects on brain regions close to the exposure source Whole brain O H O PET images were acquired 12 times 3 for each condition in a counterbalanced order Subjects were exposed for 5 min in each scan while performing a simple visual vigilance task Temperature was also measured in the head region forehead eyes cheeks ear canals during exposure The exposure induced a slight temperature rise in the ear canals but did not affect brain hemodynamics and task performance The results provided no evidence for acute effects of short term mobile phone radiation on cerebral blood flow