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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Magn Reson Med. 2015 Nov 27;76(5):1364–1374. doi: 10.1002/mrm.25973

Figure 5.

Figure 5

Images showing the features of (a–d) 2D chirp and (e–j) 2D HS1 pulses, when used to excite a cylindrical volume in a phantom (k). In all cases, the image slice orientation is perpendicular to the cylinder axis. (a,e) Images acquired with the multi-shot spin-echo sequence. (b,f) Bloch simulated excitation profiles. (c,g) Images acquired with the single-shot spin-echo sequence using spiral readout. (d,h) Bloch simulated normalized phase images. (i) Multi-shot spin-echo image acquired in the presence of a +50 Hz frequency offset, which increases the excitation radius. (j) Multi-shot spin-echo image acquired in the presence of a +50 Hz frequency offset, but using a 2D HS1 pulse with inverted ϕRF(t), which decreases the excitation radius. (k) Gradient echo axial image of the phantom (1.5% agar and 0.1 mM Gd). Images obtained from both simulation and experiment used a FOV of 192×192 mm and matrix size 192×192. TR of 200 ms and TE of 50 ms were used in all acquisitions.