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Abstract #1550

Comparison of Single-Shot 2D EPI and Segmented 3D EVI Acquisition for FMRI at 7T

Wietske van der Zwaag1,2, Tobias Kober1,3, Jose Pedro Marques1,2, Gary Glover4, Rolf Gruetter1,5, Gunnar Krueger3

1LIFMET, EPFL, Lausanne, Switzerland; 2UNIL , Lausanne, Switzerland; 3Advanced Clinical Imaging Technology, Siemens Suisse SA - CIBM, Lausanne, Switzerland; 4Stanford University, Stanford, USA; 5UNIL/UNIG, Lausanne/Geneva, Switzerland

Single shot and segmented 3D echo volumar imaging (EVI) acquisitions have a great potential for high spatio-temporal fMRI. Here, we compare multi-slice 2D EPI and segmented 3D EVI acquisitions with respect to performance in fMRI experiments and physiological noise properties at 7T. The maximum z-score and size of active regions in activation maps were found to increase significantly with 3D acquisitions. However, the asymptotic limit of temporal-SNR is lower for 3D than for 2D acquisitions. fMRI protocols using segmented EVI at high B0 should take this into account by, for example, using a small voxel size.