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Abstract #2614

Definition of the echo time for UTE imaging and short rectangular rf-pulses

Martin Krämer1,2, Karl-Heinz Herrmann2, and Jürgen R Reichenbach2
1Institute of Diagnostic and Interventional Radiology, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany, 2Medical Physics Group, Institute of Diagnostic and Interventional Radiology, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany

Synopsis

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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