Proton chemical-shift imaging with magnetically and electrically inhomogeneous objects.
Proton chemical-shift imaging with the elimination of three kinds of artifacts caused by main magnetic field inhomogeneities, susceptibility distributions of imaging objects, and the electromagnetic properties of radiofrequency (RF) fields is presented in this paper. In addition, the last of these artifacts, which is dependent upon the conductivity distributions of objects, especially in high-tesla imaging, is also demonstrated experimentally. The method proposed here enables the reconstruction of artifact-free water/fat separation images by using simple image data manipulations without the complicated phase-unwrap process, even with main magnetic field inhomogeneities larger than the chemical-shift difference between water and fat magnetizations.
Nozokido
T
T
Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan.
Yamamoto
E
E
Kohno
H
H
Yamamoto
S
S
D004553:Electric Conductivity; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008961:Models, Structural; D011846:Radio Waves