Abstract #2388

Improved semi-LASER sequence with short echo time for ultra-high field using selective GOIA refocusing pulses

Michal Považan^1,2, Lukas Hingerl¹, Bernhard Strasser¹, Gilbert Hangel¹, Eva Heckova¹, Stephan Gruber¹, Siegfried Trattnig^1,2, and Wolfgang Bogner¹

¹High Field MR Center, Department of Biomedical Imaging and Image-guided Therapy, Medical University Vienna, Vienna, Austria, ²Christian Doppler Laboratory for Clinical Molecular MR Imaging, Vienna, Austria

MR spectroscopy (MRS) profits from ultra-high field (UHF) with higher SNR and enhanced spectral resolution. However, the higher demand on bandwidth of RF pulses together with power limitations complicate the utilization of localization sequences such as PRESS or STEAM. A semi-LASER sequence appears to be a suitable candidate for UHF MRS if properly optimized. We aimed to implement selective GOIA refocusing pulses and optimize the gradient scheme to yield shortest echo time possible on a volume coil. Our semi-LASER sequence outperformed the conventional sequences in terms of SNR and chemical shift displacement artifact and proved to be applicable at UHF.

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