Disclosed is a new propeller EPI pulse sequence with reduced sensitivity to field inhomogeneities is proposed. The interferers are separated from a desired signal using independent component analysis by hypothesizing the transmitting sequence. A developing unit is swingably coupled with the drum unit and supporting the developing roller, the developer supplying roller, and the developer accommodating portion. In one embodiment, the locking assembly includes a washer that is adapted to couple to the staple body such that the spinal fixation is disposed therebetween, and a locking nut that is adapted to engage the staple body to mate the washer to the staple body. The predistortion signal is generated digitally using DSP.