Spin Echo scan considerations

Spin Echo is a 2D sequence consisting of a 90° excitation pulse followed by at least one 180° refocusing pulse. The 90° pulse creates magnetization in the transverse plane, and the 180° pulse rephases the magnetization to produce spin echo signals.

With Spin Echo, either one, two, or four echoes can be acquired within a single acquisition. Spin Echo is used to acquire images with T1-, Proton Density-, or T2-weighted contrast.

Table 1. Single echo image legend

#	Description
1	90°
2	180°
3	TE
4	TR

Variable echo is a two-echo acquisition where the second echo does not have to be a multiple of the first echo (e.g., TE1 = 20 ms, TE2 = 90 ms).

Table 2. Variable echo image legend

#	Description
1	90°
2	180°
3	TE1
4	TE2
5	TR

Use Spin Echo sequences to acquire images with T1-, PD-, or T2- weighted contrast in all anatomical areas.

Consider this information when modifying Spin Echo scan parameters. For specific scan parameter values, select a protocol from your GE or Site library.

• Scan selections: 2D Mode, Spin Echo family, Spin Echo pulse.