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how to calculate the diameter of a vessel

Asked by bil bbil on 17 Apr 2014
Latest activity Commented on by bil bbil on 20 Apr 2014
hello everyone
I really need help as soon as possible
I want a solution to calculate the diameter of each white line in the image(Vessel Diameter Measurement)

  1 Comment

Compute the radius. Multiply by 2.
Really, we are not here to do your homework as soon as possible. IF you could not start it in a timely way, then why should we rush?
Make an effort, as that is the way to learn. Or don't make an effort. In that case, learn to say the phrase "Do ya want fries with that order?"

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3 Answers

Answer by Sean de Wolski
on 17 Apr 2014
 Accepted Answer

You might find the second part of this webinar helpful:

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Answer by Nitin
on 17 Apr 2014

I would start by first experimenting with regionprops function in matlab

  1 Comment

you have an idea how to fit in my case??

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Answer by Image Analyst
on 17 Apr 2014
Edited by Image Analyst
on 17 Apr 2014

It's pretty easy - maybe 3 lines of code. First call bwdist to get the distance from the white pixels to the nearest black pixel. Then call bwmorph to skeletonize that so you get the distances along the centerlines. That's the radius so multiply by two to get the diameter. It will be an image looking like a skeleton and to find the diameter you simply look at the value of the pixel at the location you want the diameter of. Basically it's this (untested):
edtImage = 2 * bwdist(~binaryImage);
skeletonImage = bwmorph(binaryImage, 'skel', inf);
diameterImage = edtImage * double(skeletonImage);
Can't get much simpler, though you may want to add a utility where you let the user call ginput() to report back the diameter at the closest pixel to where they clicked. It's pretty easy, though clever and not obvious (until you know about it), so most novices might embark on some complicated looping process to get cross sections (what a nightmare that would be).

  2 Comments

bil - are you still around? Did it work?
Sorry for the delay,,I followed the example in medical-image-processing,,I had it calculated the bifurcation points

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