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Factors altering PPG response.45
| Sensing | Sensor geometry |
| Emitted light intensity | |
| Sensor-skin interface | |
| Ambient light | |
| Photodiode sensitivity | |
| Biological | Oxygen concentration |
| Organ characteristics | |
| Cardiovascular | Microcirculation volume |
| Arterial blood volume | |
| Interstitial fluids | |
| Venous volume |
