Metal artifacts : step 3

To begin, we will try to segment the metallic object using a simple threshold value. ImageJ is good for that.

Fig .4 : Threshold choice with ImageJ

Here we can see that all the pixels above the value of 119 belongs to the metallic part. We will know create an image containing only the metallic part and calculate its sinogram.

Fig .5 : Metallic part (left), Sinogram of the metallic part (right)

Now we have separated the metallic part sinogram, it will be easy to remove it from the global sinogram.