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Why is there a bright line along some vessels ?

The bright line you see along some vessels is specular reflection which is coming off the vessel wall.
The application detects and attempts to avoid areas of specular reflection and for 1st and 2nd degree vessels this works well. One should be careful about measuring small vessels in individuals where you see a large amount of specular reflection. In short, specular reflection should not pose a problem but if you suspect that the measurements may be off because of this then we recommend only analysing the bigger vessels.

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