Date of approval:
For PRC use only
Signature of Chair:
Siemens Vision 1.5T Sequence Description
Sequence name: Double-echo TSE T2 measurement sequence.
Developer: Jan Hrabe
Date: 9/28/2004
Filename: tse_dblecho_v20.wkc
Location: /usr/appl/sequence/local
Other files: none (except the standard Siemens system files)
Brief description: This sequence is based on a standard Siemens double-echo TSE sequence with
the following changes: max. TR increased to 15 s, max. number of slices increased to 64, slice
thickness and FOV are afforded a finer adjustment. Some default values were also changed without
changing the parameter limits.
Parent sequence: tse5_22rrb130_90rrb130.wkc
RF safety: The SAR does not exceed the maximum admissible values. RF pulses were not changed.
Gradient safety: Gradient switching rate has not been increased.
Parameter meanings, limits and defaults:
 Recommended matrix size 160 x 256, RFOV 5/8
 Target voxel size 1.2 x 1.2 x 2.4 mm3 with 64 contiguous interleaved slices
 TE1 = 22 ms, TE2 = 90 ms are fixed
 Fat saturation and inferior saturation slab 50 mm are recommended
Usage notes: Typical TR is about 12 s, giving total acquisition time approximately 6.5 min. With
basic approximately transverse slice orientation, chose the phase-encode direction from left to right
and use 100% matrix 160 x 256 with no oversampling. In combination with RFOV 5/8, this leads to
a convenient voxel size without adverse filtering effects (see above). Due to fixed echo-train length,
only some combination of geometrical parameters are possible.
Appendices: 1. Complete sequence code listing.