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Abstract #0311

Acceleration of arterial spin labeling data acquisition using spatio-temporal total generalized variation (TGV) reconstruction

Stefan Manfred Spann1, Christoph Stefan Aigner1, Matthias Schloegl1, Andreas Lesch1, Kristian Bredies2, Stefan Ropele3, Daniela Pinter3, Lukas Pirpamer3, and Rudolf Stollberger1,4

1Institute of Medical Engineering, Graz University of Technology, Graz, Austria, 2Institute of Mathematics and Scientific Computing, University of Graz, Graz, Austria, 3Department of Neurology, Medical University of Graz, Graz, Austria, 4BioTechMed-Graz, Graz, Austria

3D imaging sequences such as GRASE or RARE-SoSP are the preferable choice for acquiring ASL images. However, a tradeoff between the number of segments and blurring in the images due to the T2 decay has to be chosen. In this study we propose a reconstruction algorithm based on total generalized variation for reducing the number of segments and therefore the acquisition time of one image. We incorporate the averaging procedure in the reconstruction process instead of reconstructing each image individually. This allows exploiting temporal redundancy and spatial similarity for improving the reconstruction quality of ASL images.

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