Finding maximum axial slice location from 3D binary label

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banikr
banikr 2020-4-17
评论： darova 2020-4-17
Hello,
I want to find the maximum axial slice location/number/position of a 3D binary mask.
which means the slice location where the binary mask ends.
  2 个评论
banikr
banikr 2020-4-17
编辑：banikr 2020-4-17
could you describe or specify how to use min max in this case?
The data size is 172, 220, 156.
I can write a for loop and including sum() option. But I wonder if there are simple matlab code for that.

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回答（1 个）

darova
darova 2020-4-17
  • Use find to find all values
  • Use ind2sub to convert indices to i,j,k (x,y,z)
ix = find(V(:)); % find nonzero values
[i1,i2,i3] = ind2sub(size(V),ix); % convert to i,j,k
[~,imax1] = max(i1); % max i
[~,imax2] = max(i2); % max j
[~,imax3] = max(i3); % max k
plot3(i1(imax1),i2(imax1),i3(imax1),'.r')
  2 个评论
banikr
banikr 2020-4-17
Hey @darova,
I think I have got what I was looking for.
[~,imax3] = min(i3);
This actually gives the final slices as matlab starts counting from bottom.
I was available to crop the bottom slice location.
Thanks!!

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