Multi-Aperture PPG with MAPIS: Spatial Optical and Temporal Coherence Fields
Conventional reflectance photoplethysmography (PPG) typically reduces tissue optical responses to one or a few detector channels. Matrix Pinhole Image Sensing (MAPIS) instead simultaneously samples multiple aperture-dependent optical signals. We analyzed 44 recordings of 30 seconds each from a single MAPIS device to characterize the spatial relationships among DC intensity, pulsatile AC, perfusion index (PI), and temporal coherence across Red and infrared channels. AC increased sublinearly with DC at both wavelengths, resulting in higher PI toward lower-DC apertures, consistent with a first-order relative path-sensitivity interpretation. A second counterintuitive spatial trend was observe...
| Authors | Shuguang Wang, Yuanjing Wang |
|---|---|
| Primary category | physics.optics |
| Published | 27 September 2026 |
| Last updated at source | 27 September 2026 |
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