We used shielded RF coil in combination with unshielded PET detector. A microstrip coil and a head-size birdcage coil was used. For microstrip coil, the ground conductor acted as the shield, while for the birdcage coil a cylindrical RF shield was implemented. A PET detector with front-end electronics was implemented 40 mm far from the RF shields. Phantom studies revealed no RF pickup noise in any of these cases. A maximum 16% reduction in SNR was seen for the microstrip coil between PET detector powered OFF and ON conditions. However, the SNR reduction for the birdcage coil was negligible.