text: can anyone tell me how magnetic resonance imaging works?   i highly recommend this site (formerly called fmri for dummies, lol!) http://psychology.uwo.ca/culhamlab/jody_web/fmri4newbies.htm  it's a really really good site, with tonnes of illustrated diagrams and information on all asects of fmri (and mri). here's a direct link to a pdf file of the basis of fmri and mri  http://psychology.uwo.ca/culhamlab/jody_web/fmri4dummies/pdfs_and_ppt/basic_mr_physics_grey.pdf  hope that helps!