Figure 1

(A) Cropped version of the Siemens Syngo navigator image that was processed in real-time during CMR acquisition to yield the feedback game. (B) Example frame of the navigator feedback videogame interface, which is shown to the child during DENSE CMR (yellow overlay text is not shown to the child). The fish's position is restricted to vertical translation and represents the diaphragm position relative to the acceptance window location (green lines). The objective of the game is to control the fish so that the fish "gulps" as many bubbles as possible, which scroll across the screen from right to left in between the green lines (acceptance window). A score counter incentivizes children to spend more time with their diaphragm within the acceptance window.