I have a set of 2D pictures from a CT scan.
How can I convert them into a 3D model for 3D printing? An example looks like this:
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Using the terms "convert CT scan to 3D model," I found a number of links of tutorials. One of them is described as free, with registration and appears to be web based. The link, Embodi3D, appears to have a relatively comprehensive set of instructions to accomplish your goal.
Instructables also has a similar tutorial. Should neither of these prove suitable, the search terms above may be of value.
Knowing the layer thickness, you can manually re-engineer/design the object:
.stldepending on your program, slice and print.