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Fig. 4 | BioMedical Engineering OnLine

Fig. 4

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

Fig. 4

Relationship between ECG, PO PPG and vPPG signals. Typical fiducial points of the ECG and their position relative to the cardiac cycle are shown. The systole lasts from the R-wave to the T-wave, followed by the diastole until the next R-wave. The PO PTT (pulse transmit time) is usually measured from the ECG R-wave to the beginning of the next PO rise. Triggers computed by the MRI-vendor-provided software on the basis of the PO signal are marked by black dots

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BioMedical Engineering OnLine

ISSN: 1475-925X

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