Fundamentals of Camera-PPG Based Magnetic Resonance Imaging.
IEEE J Biomed Health Inform
; 26(9): 4378-4389, 2022 09.
Article
in En
| MEDLINE
| ID: mdl-34928810
ABSTRACT
In Magnetic Resonance Imaging (MRI), cardiac triggering that synchronizes data acquisition with cardiac contractions is an essential technique for acquiring high-quality images. Triggering is typically based on the Electrocardiogram (ECG) signal (e.g. R-peak). Since ECG acquisition involves extra workflow steps like electrode placement and ECG signals are usually disturbed by magnetic fields in high Magnetic Resonance (MR) systems, we explored camera-based photoplethysmography (PPG) as an alternative. We used the in-bore camera of a clinical MR system to investigate the feasibility and challenges of camera-based cardiac triggering. Data from ECG, finger oximeter and camera were synchronously collected. Compared to finger-PPG, camera-based PPG provides a higher availability of the signal and the PPG marker delay relative to the ECG R-peak is considerably less with a camera monitoring the forehead. The insights obtained in this study provide a basis for an envisioned system-design phase.
Full text:
1
Database:
MEDLINE
Main subject:
Photoplethysmography
/
Electrocardiography
Limits:
Humans
Language:
En
Journal:
IEEE J Biomed Health Inform
Year:
2022
Type:
Article