Region growing segmentation

Region growing segmentation seems like a relatively easier thing to use to segment the pulmonary venous drainages. I will be trying to implement a Seeded Region Growing segmentation to start extracting the drainage patterns. However, I anticipate that Region-growing might not work perfectly with veins. The problem with region growing is that it seems to explode and find its way out somehow out of the region which we are interested in. To get a jist of how difficult segmentation might get, have a look at the MRI image above. I wish everyday that MRI image acquisition was clearer.

In near future, I will also be looking at other image segmentation techniques used in medical imaging. There is a good piece of literature out there that explores out all the different techniques that have popularly been used in segmenting medical images. Here's the paper.