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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Magn Reson Med. 2017 Sep 14;79(5):2533–2541. doi: 10.1002/mrm.26898

Figure 1.

Figure 1

Different k-space sampling strategies in FSE-PROPELLER (a), Turboprop (b), X-PROP (c), and Steer-PROP (d). Only a segment of the pulse sequence between two consecutive refocusing RF pulses is shown. In FSE-PROPELLER (a), each spin echo is used to sample a k-space line in a blade. All spin echoes in a TR are used to sample a single PROPELLER blade. In Turboprop (b), X-PROP (c), and Steer-Prop (d), each spin echo is split into three gradient echoes. Turboprop uses all three gradient echoes to sample the same widened PROPELLER blade. X-PROP assigns the odd (solid lines) and even spin echoes (dash lines) into orthogonal blades and distributes all six blades evenly over an angular range of π, whereas Steer-PROP distributes the three gradient echoes to adjacent blades with a narrow angular range.