How many sessions for tattoo removal?

I have had 18 treatments and my tattoo has not been completely removed, but it is barley noticeable.

I have been getting treatments from a medlite C6 laser at Rethink Your Ink in Calgary, Canada.

I have a blog of all the before and after pictures of each treatment, and also a video of one of the sessions at http://www.tattooremovalcalgary.com

J.