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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Magn Reson Med. 2016 Oct 3;78(3):950–962. doi: 10.1002/mrm.26481

Figure 1.

Figure 1

1D dynamic SPI acquisition for gradient measurement. An example of (a) targeted gradient, (b) the corresponding SPI encoding gradient, (c) RF transmission and data acquisition, (d) k-space trajectory, (e) image domain SPI data, (f) k-space domain SPI data, and (g) merging filter. 1D SPI sampling can be implemented by simple linear scaling the gradient amplitude with each TR. Note that the FOV change directly reflects the gradient shape. The image or k-space domain data can be adaptively used for FOV scaling search, according to the FOV at encoding time.