How does the VENDYS method compare to laser Doppler flowmetry (LDF)?
A7. Several studies have shown that skin temperature correlates strongly with skin blood flow measured by LDF. However, unlike LDF, which is sensitive to red blood cell motion only at the skin level (1-2 mm depth), VENDYS temperature signals can reflect blood flow changes in both skin and subcutaneous tissues simply because the heat from the inrush of warm blood travels from deep tissues to the skin surface. Also, LDF is markedly sensitive to any movement at the measurement site, whereas VENDYS is not affected by finger motion.
