Keywords: Pulse Sequence Design, Pulse Sequence Design, UTE
Motivation: Currently, in UTE literature, there is inconsistency in defining echo time when short rectangular excitation pulses are used.
Goal(s): Investigate whether echo-time should be defined from the center or the end of the short rectangular rf-pulse.
Approach: Theoretical considerations, simulations, and measurements with a 3D-UTE sequence.
Results: Two MR signal mechanisms were investigated: (I) relaxation and (II) off-resonance effects during the rf-pulse. In both cases, defining echo time from the rf-pulse center was more accurate.
Impact: Results indicate that defining TE from the center of short rectangular RF pulses is more accurate, suggesting the community should adopt this TE definition for future UTE applications.
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