Table 1. Technical characteristics of laser Doppler flowmetry (LDF), Laser Speckle Contrast Imaging (LSCI) and Tissue Viability Imaging (TiVi).
| LDF | LSCI | TiVi | |
|---|---|---|---|
| Measurement principle | Doppler effect | Speckle contrast | Polarization spectroscopy |
| Measurement parameter | Perfusion | Perfusion | Red blood cell concentration |
| Spatial resolution | * | 500 μm | 50 μm |
| Measurement area | ~ 1 mm2 | 15x15 cm2 | 40x40 cm2 |
| Temporal resolution | 33 Hz | Up to 44 images/s | Up to 25 images/s |
| Measurement depth | ~ 0.5 mm | ~ 0.5 mm | ~ 0.5 mm |
LDF: laser Doppler flowmetry, LSCI: laser speckle contrast imaging, TiVi: Tissue Viability Imaging, fps: frames per second.
* since LDF measures perfusion in a single-point, the spatial resolution (distance between adjacent measurement points) is not defined.