Which MRI sequences are most likely to produce eddy currents?

Fast gradient echo sequences are the most likely to produce eddy currents due to the rapid switching of the gradient coils. These sequences utilize steep and rapid changes in magnetic gradients to collect data quickly, which can induce secondary electrical currents, known as eddy currents, in the conductors of the gradient coil system and surrounding materials. The swift alternation of these gradients can lead to delays and distortions in the imaging process caused by the eddy currents, particularly affecting image quality and stability.

Other sequences like T2-weighted sequences, spin echo sequences, and inversion recovery sequences typically involve slower gradient changes or rely more heavily on radiofrequency pulses rather than rapid gradient switching, making them less susceptible to the formation of eddy currents. The design of fast gradient echo sequences inherently incorporates faster gradient ascent and descent phases that contribute more significantly to the generation of eddy currents compared to the more gradual changes associated with the other types of sequences.