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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: Magn Reson Med. 2016 Aug 16;78(2):472–483. doi: 10.1002/mrm.26376

Figure 3.

Figure 3

The SI projections from the “spiral-out” ROCK (a) is subject to distortions due to eddy current artifacts and the same artifact is much alleviated in the “spiral-in” ROCK (b). Compared with images acquired using GRAPPA under-sampling, the images acquired using ROCK in 1.5T (c) and 3T (d) have better quality and less artifacts, though high under-sampling rates were achieved. In the ROCK method, the k-space after retrospective data binning has near-uniform angular distributions. The slightly different sampling pattern and under-sampling rate of different cardiac phases do not result in noticeable differences in image quality.