The spin-echo sequence is used to produce a T2-weighted contrast. However, it is a slow sequence as it demands long repetition times. The turbo-spin-echo sequence can be used to accelerate the imaging process, by acquiring many echoes instead of just one. This is achieved by the executing of many 180° pulses. Very high acceleration factors can be achieved by this approach. The downside is that this is a SAR-intensive sequence, and that the contrast is not identical to that obtained by a regular spin-echo sequence.