Surface Area method for portions of segment or from landmarks OS: Windows 10Pro Slicer version: 4.11.20210226 Data file location: For Forum Upload.zip - Google Drive I am trying to get surface area of a portion of a segment, or model. I am working with hummingbird bills and hoping to create a wo…

As I understand you only want the SA of the dorsal (top) of the bill? Is that correct? Probably the simplest solution is to use the Surface Cut effect in Segment editor, cut out the portion you want to retain via using closed curve markup, and then use the Segment Statistics module to calculate the…

Hi @muratmaga , thanks for the prompt reply. So I would: Isolate the upper bill with Surface cut (directly from CT scan?) > Use closed curve to choose the area on the segment I’d like to keep (line along the edge of the bill to circle around the dorsal side of the bill). Btw can I constrain a resa…

@muratmaga I did find a potential solution to my own question for 3 using the second code chunk that Andras gave in this link . Attached is what it looks like it’s measuring, which is within the closed curve, but is unfortunately the under side of the bill. [measured area] It also seems like it’s…

[image] Rosalee_Elting: a potential solution to my own question for 3 using the second code chunk [image] Rosalee_Elting: Has there has been an updated method to do this beyond the Python console? If you use a Closed Curve, the surface area is available right away in the Markups module…

[image] Rosalee_Elting: It also seems like it’s adding a “cap” here, to the end of the bill, which might resolve when we’re measuring the dorsal area I am not sure why it is recapping only a portion of the closed surface. As I recall it should visualize entire area that’s encompassed by the c…

More or less I think until step 3 you are on your way. You could use this tool New Dynamic Modeler Tool: Select by Points to extract the surface Then use the this filter VTK: vtkMassProperties Class Reference to calculate the surface area. Also try to take a look at how the surface area calculati…

@chir.set I didn’t know I could get this data from a closed curve in markups— thank you! [image] muratmaga: Otherwise, I think the surface cut in segment editor would work too. @muratmaga This worked pretty well too. Here is my original segment, with a new segment of the surface, whose point…

I think you could change the algorithm to ‘geodesic’ on the selectByPoints tool options to avoid the problem you show. Let me know if you achieve it

[image] Rosalee_Elting: I was able to replicate your point locations, more or less, with the surfaceMarkup method. Points will snap to the surface once they are close enough. Most of your points are currently inside the model. Turn the model so that you are seeing lateral view approximately, …

@muratmaga This helped with getting the points on the surface, thank you! It looks like I can start with a small grid, then “resample” with a larger grid to get more points and adjust them to the surface. I assume when this is a stable release the SA measurements might be available? @mau_igna_06 Ge…

Surface Area method for portions of segment or from landmarks

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chir.set (SET) March 23, 2022, 7:48am 5

If you use a Closed Curve, the surface area is available right away in the Markups module. It seems that’s what you are looking for, right ?

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Surface Area method for portions of segment or from landmarks

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