Analysis of MRI antenna loaded by an elliptical subject

Previously, the authors developed a computer code for obtaining the current distribution on the MRI antenna loaded by a man model with an arbitrary geometry and material properties by incorporating the impedance 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 theoretically. It is found that the sensitivity of the antenna fed at the angle 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 antenna.