GRAPPA/ARC methods correct, then reconstruct.
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In addition to their standard product, GE offers the option to run ARC in "Turbo Mode" to speed up the scan by up to a factor of 2. TurboARC adjusts the data sampling pattern to acquire fewer data points in the k-space periphery. The pattern of filling (centric vs elliptical centric) may also be adjusted.
Blaimer M, Breuer F, Mueller M, Heidemann RM, Griswold MA, Jakob PM. SMASH, SENSE, PILS, GRAPPA. How to choose the optimal method. Top Magn Reson Imaging 2004;15:223-236 [review].
Brau A. New parallel imaging method enhances imaging speed and accuracy. GE Signa Pulse, 2007; 36-38. (Promotional piece describing GE's ARC method).
Brau ACS, Beatty P, Skare S, Bammer R. Comparison of reconstruction accuracy and efficiency among autocalibrating data-driven parallel imaging methods. Magn Reson Med 2008; 59:382-395
Deshmane A, Gulani V, Griswold MA, Seiberlich N. Parallel MR imaging. J Magn Reson Imaging 2012;36:55-72. (review)
Griswold MA, Jakob PM, Heidemann RM, et al. Generalized autocalibrating partially parallel acquisitions (GRAPPA). Magn Reson Med 2002; 47:1202-1210
Our scanner has two different options for parallel imaging (SENSE and GRAPPA). What are they and which should I use?