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← ScienceWhich outcome reduces contrast in optical coherence tomography (OCT)?
A)Speckle from low spatial coherence✓
B)Increased signal-to-noise ratio emerges
C)Reduced penetration depth happens
D)Improved axial resolution prevails
💡 Explanation
Speckle reduces OCT contrast because it arises from interference of backscattered light. The **speckle formation** mechanism causes random intensity variations. Therefore, speckle obscures the underlying tissue structure, rather than SNR arising or axial resolution improving, because those require highly correlated light.
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