Fig. 10.

Algorithm performance with videos obtained in MRI scanner room. For each of the 24 videos, triggers were computed with the algorithm and parameters $N=125$, $M=50$, and $T=200$. For each subject, the results from stage (1) (outside MRI bore), stage (2) (inside MRI bore without imaging), and stage (3) (inside MRI bore with imaging) are shown. Boxplots of intervals between consecutive triggers based on PO, ECG, and vPPG are shown. a, b and c mark videos that are shown in detail in Fig. 11. An x marks videos where the vPPG triggering has been labeled as unusable