I'm now in the habit of monitoring the condition of my used filters and cutting the drained filters apart with a Dremel and the thin style cut-off wheel.
Takes about 2 minutes, after some practice, to extend the cut entirely around the can. Since the filter is held on its' side, the cutting debris tends to stay in the residual oil film near the cut.
Normally I just wipe the chips & dust away at the cut end before I turn the can upright to inspect for particles in the bottom and in the filter pleats.
However, if for some reason a more detailed analysis is needed, I would certainly buy a good quality cutter. And then use it to split apart a full filter & pour the contents into a paper towel or coffee filter to capture everything in the dirty oil side of the can.