evidence for a dosedependent effect of pulsed magnetic fields on pain processing functional magnetic resonance imaging fmri was used to investigate the doseresponse relationship sham 100 200 1000 microt between a pulsed extremely low frequency magnetic field elfmf and acute thermal pain on the dominant right hand fortyseven participants were recruited and pulsed elfmf was applied through the mri gradient system using a novel technique regions of interest rois matching those of previous studies were examined for a potential dose response significant correlations between applied field strength and change in bold activity were found in the anterior cingulate and the ipsilateral insula indicating that there might be either a dose response or a threshold effect of the elfmf