Initial evaluation of prospective cardiac triggering using photoplethysmography signals recorded with a video camera compared to pulse oximetry and electrocardiography at 7T MRI

Table 2 Comparison of PO and vPPG triggers during MRA of a healthy volunteer

Scan	Cardiac cycles	Missed cardiac cycles		Cardiac cycle durations (ms)		Trigger delay and jitter (ms)
Scan	Cardiac cycles	PO PPG	vPPG	PO PPG	vPPG	vPPG
1.	73	0	0	931 ± 48	923 ± 42	401 ± 157
2.	74	0	0	975 ± 76	970 ± 79	312 ± 129

Scan (1) is associated with the upper MIP and scan (2) with the lower MIP in Fig. 12. The trigger delay was measured as the mean difference in absolute trigger times between both methods and the trigger jitter as the sd

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