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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2013 Feb 13;86(1):198–204. doi: 10.1016/j.ijrobp.2012.12.014

Figure 2.

Figure 2

Illustration of the respiratory amplitude based 4DMRI acquisition method. The respiratory cycle is divided into 4 states: 0%, 50%↑, 100%, and 50%↓. The whole acquisition includes 4 dynamic scans. In each dynamic scan, each slice is assigned to a specific respiratory state and one image is acquired for that slice. For the next dynamic scan, each slice is associated to a different respiratory state and another image is acquired for each slice. This process continues until images from all four respiratory states are acquired for every slice.