Abstract #3694

Compressed Sensing for MRSI with Concentric Ring Trajectories at 7 T

Bernhard Strasser¹, Ovidiu C Andronesi², Lukas Hingerl¹, Stanislav Motyka¹, Siegfried Trattnig¹, Wolfgang Bogner¹, and Antoine Klauser³

¹Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, ²Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ³Department of Radiology and Medical Informatics, University of Geneva, Geneva, Switzerland

Synopsis

Keywords: Spectroscopy, New Trajectories & Spatial Encoding MethodsWe show the feasibility of compressed sensing for MRSI using concentric ring trajectories. Four volunteers (three for 2D- and one for 3D-MRSI) were measured in about 9 minutes (2D-MRSI), and 14 minutes (3D-MRSI) using an FID-based MRSI sequence at 7 T. An iterative compressed sensing reconstruction including coil sensitivities and a total general variation spatial regularization was performed with retrospective undersampling factors of 1.5, 2.0 and 2.9. RMSE values were below 22 % and SSIM values above 0.8 for medium accelerations below 2.9 in the 2D case. The metabolic maps and spectra are similar to the gold standard without acceleration.

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