Multi-slice Imaging
How does the MR scanner keep track of which signal comes from which slice?
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In 2DFT imaging, each slice is individually excited and its MR signal separately recorded and stored. Multi-slice acquisition is possible because of the "wait times" or "dead times" within the structure of most MR imaging sequences.
The wait time between echo collection and the next 90°-pulse can be put to good use by stimulating and recording signals from other slices during this period. The interfering frequencies between slices (ω1 and ω2) occur at different times and hence do not interfere. |
Staggered slices applied during long wait times helps prevent slice-slice interactions and frequency overlap.
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Related Questions
What is cross-talk and what can be done about it?
What is cross-talk and what can be done about it?