How to measure distance along the surface of segmented or volume rendering aorta?

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i want to measure distance between 2 points along the surface of aorta, how can i achieve it? thanks!

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You can create a markups curve with two endpoints and choose “Shortest distance on surface” curve type:

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The curve will go through the mesh points, so if the mesh resolution is low then the curve may not be smooth/straight. If you find that the curve is not good enough quality then you can subdivide the mesh to have more candidate points for the curve to go through.

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Dear Lassoan, in my vision (4.13.0), there is no vessel in Model Node, should i download some module?捕获

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You can choose any model node. If you have the aorta as a segmentation node then you can export it to a model node by right-clicking on it in Data module.

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________________________Thanks