title: Measurements of magnetic field variations in the human brain using a 3D-FT multiple gradient echo technique.
abstract: A magnetic resonance 3DFT multiple gradient-echo technique was used for measurements of the proton spectrum for each voxel in the measured slice. Water, fat, magnetic field and T2 distributions in the head of a normal volunteer and a patient with intracerebral hematoma were computed. Magnetic field variations caused by the head were calculated after correction for the static magnetic field inhomogeneity. Large local magnetic field variations up to 3 ppm were found in the human brain near interfaces between air or bone and brain tissues and 0.5 ppm between hematoma and brain tissue. Information about magnetic field variations could be useful for shimming procedures in vivo and for correcting artifacts in imaging and spectroscopy.
authors.affiliation: Department of Diagnostic Radiology, University Hospital, Uppsala University, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Ericsson
authors.forename: J
authors.initials: J
authors.lastname: Weis
authors.forename: A
authors.initials: A
authors.lastname: Hemmingsson
authors.forename: M
authors.initials: M
authors.lastname: Wikström
authors.forename: G O
authors.initials: GO
authors.lastname: Sperber
mesh_terms: D000368:Aged; D000388:Air; D016477:Artifacts; D001921:Brain / Q000473:pathology*; D001929:Brain Edema / Q000175:diagnosis; D002543:Cerebral Hemorrhage / Q000175:diagnosis; D006406:Hematoma / Q000175:diagnosis; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007501:Iron / Q000097:blood; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008297:Male; D008961:Models, Structural; D009296:Nasal Cavity / Q000033:anatomy & histology; D010256:Paranasal Sinuses / Q000033:anatomy & histology; D010579:Petrous Bone / Q000033:anatomy & histology; D011522:Protons
chemical_list: D011522:Protons; D007501:Iron