An Analysis of an Extended Cavity TEM Coil
McKinnon G, Boskamp E
Integrating an RF body coil into a gradient structure is one approach for increasing the patient bore diameter. In one practical embodiment the RF coil is necessarily very short. However, an extended RF cavity in the space between the primary and shield gradient windings can improve the RF performance substantially. Here a TEM coil with an extended cavity is analyzed both numerically, using the finite-difference time-domain, and with a physically model; and performance as a function of cavity length is characterized.