ANALYSIS OF MRI ANTENNA LOADED BY AN ELLIPTIC SUBJECT

Previously, the authors developed a computer code for obtaining the cu rrent distribution on the MRI antenna loaded by a man model with an ar bitrary geometry and material properties by incorporating the impedanc e method into Richmond's method. By this method, the relation between the position of the feeding point and the sensitivity of the 1.5 T-MRI antenna loaded by an elliptic cylindrical subject is discussed theore tically. It is found that the sensitivity of the antenna fed at the an gle of 45 degrees measured from the minor axis of the ellipsoid of the subject is different from that of the antenna fed at the angle of 45 degrees because the elliptic polarization is produced inside the anten na.