Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Experimental methods and magnetic imaging

MA 30.1: Vortrag

Mittwoch, 2. April 2014, 15:15–15:30, HSZ 403

Double-ICEBERG pulses: A next step towards global pulse sequence optimization in NMR — •Simone Köcher and Steffen Glaser — Department of Chemistry, TU München, Garching, Germany

ICEBERG-pulses (Inherent Coherence Evolution optimized Broadband Excitation Resulting in constant phase Gradients) include phase evolution during the radio frequency pulse and create a linear phase dispersion [1]. The ICEBERG concept is extended to consider not only a final phase dispersion but also an initial one, hence called double-ICEBERG-pulses. An optimal control optimization routine for double-ICEBERG-pulses with linear phase slopes is developed which is based on the description by unitary rotations [2]. The effects of phase dispersion, flip angle, and pulse duration on the achievable pulse performance are explored and interpreted by an Euler decomposition scheme. This scheme provides a concept for the design and approximation of ideal pulses. The increased flexibility of double-ICEBERG-pulses offers an additional gain in pulse performance and more adaptability in pulse design.

[1] N. I. Gershenzon, T. E. Skinner, B. Brutscher, N. Khaneja, M. Nimbalkar, B. Luy, S. J. Glaser, J. Magn. Reson. 192 (2008), 235-243

[2] N. Khaneja, T. Reiss, C. Kehlet, T. Schulte-Herbrüggen, S. J. Glaser, J. Magn. Reson. 172 (2005), 296-305