Abstract #4330
Dynamic k T -points: a new concept to improve T 2 -weighted imaging at 7T
Florent Eggenschwiler 1 , Kieran R. O'Brien 2,3 , Bndicte Marchal 3,4 , Rolf Gruetter 1,2 , and Jos P. Marques 5
1
Laboratory for Functional and Metabolic
Imaging, Ecole Polytechnique Fdrale de Lausanne,
Lausanne, Vaud, Switzerland,
2
Department
of Radiology, University of Geneva, Geneva, Geneva,
Switzerland,
3
CIBM
- AIT, cole Polytechnique Fdrale de Lausanne,
Lausanne, Vaud, Switzerland,
4
Advanced
Clinical Imaging Technology, Siemens H IM BM PI,
Lausanne, Vaud, Switzerland,
5
Department
of Radiology, University of Lausanne, Lausanne, Vaud,
Switzerland
At high field, the B
1
+
inhomogeneity
causes undesirable signal and contrast variations across
the brain. It has been shown that those artifacts can be
corrected by designing a single k
T
-point
pulse in the STA regime to replace all the hard pulses
of a TSE sequence. In this work, to further improve T
2
-weighted
imaging, a specific k
T
-point pulse is
designed for each sequence pulse (dynamic k
T
-point
design). K
T
-points were thus included to the
SR-EPG formalism in order to optimize the magnetization
state throughout the TSE sequence such that the signal
across the brain matches the targeted one for each
sequence echo.
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