Figure 1

Different respiratory gating strategies to acquire DENSE image data for R-R interval #2. (A) Retrospective gating requires the diaphragm location to be within the acceptance window immediately following DENSE imaging in order to utilize DENSE images acquired during R-R interval #2. (B) Prospective gating requires the diaphragm location to be within the acceptance window before DENSE imaging (during R-R interval #1) in order to utilize DENSE images acquired during R-R interval #2. (C) Combined gating requires the diaphragm location both before and after DENSE imaging to be within the acceptance window in order to utilize DENSE images acquired during R-R interval #2.