Spin echo sequences

Spin-echo pulse sequences are one of the earliest developed and still widely used (in the form of fast spin-echo) of all MRI pulse sequences. The pulse sequence timing can be adjusted to give T1-weighted, proton density, and T2-weighted images. Dual echo and multiecho sequences can be used to obtain both proton density and T2-weighted images simultaneously.

The two variables of interest in spin echo sequences are the repetition time (TR) and the echo time (TE). All spin echo sequences include a slice selective 90-degree pulse followed by one or more 180 degree refocusing pulses as shown in the diagrams.

Imaging technology

Article information

rID: 22136
Synonyms or Alternate Spellings:
  • Spin echo sequences
  • Spin echo pulse sequences

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Cases and figures

  • Figure 1: spin echo (SE)
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  • Figure 2: fast spin echo (FSE)
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  • Figure 1: SE vs FSE
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  • Figure 4: spin echo sequence
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