by Discount Bluehost


Published: Sunday, 22 December 2013

For the visualization, use view3d.

Exercise 1.

Image: For this exercise use the following image: carotide.pgm

Task: Extract the median lines in the different ramifications of the carotid artery. The image shows a 3D acquisition of the artery going from the heart to the brain. Your task is to segment the arteries, and find the artery directions using skeletonization. The solution should be carried out in three steps:

  1. Extract and filter the calcifications
  2. Extract the artery
  3. Find the artery directions by skeletonizing the segmented arteries

Operators: selectcomp, skeleton

Exercise 2.

Image: For this exercise use the following image: cerveau.pgm

Task: Extract the gyri from the cerebral cortex. The solution should be carried out in three steps:

  1. Segment the white matter of the brain
  2. Segment the white matter by guaranteeing the topology of a ball. After the conception the brain development starts from a simple ball-like form. As the gyri and the sulcuses are formed, the brain's topology never gets broken. This means that there are no holes which form during the development. The idea of the segmentation is to start from a single point in the center of the brain and topologically growing the point until the pre-segmented object is reached or the topology would get broken, should we insert any new point.
  3. Extract the planar directions of the gyri. This means to extract a 2D skeleton from the segmented gray matter.


Exercise 3.

Image: For this exercise use the following image: foie.pgm

Task: Extract the tree of the arteries in the liver. You can carry out the segmentation with the following two steps:

  1. Segmentation by homotopic growing
  2. Segmentation by homotopic shrinking

Operators: render

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