Which mechanism causes increased speckle contrast when an endoscopic OCT system's tunable laser scans tissue?

💡 Explanation

Increased speckle occurs when multiple scattering points coherently interfere. Speckle contrast rises because coherent interference between these scatterers becomes highly sensitive to tiny positional or wavelength changes, therefore speckle varies randomly, rather than being simply a result of scattering amplitude or simple image blur.

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