Artichokes in brine are quite acidic & tend to add a vinegary taste to the pizza, even if you dry them out. Artichokes marinated in olive oil are a much better choice.
Matt
I have to agree with Matt...
If you have canned 'chokes you are wanting to use, it would probably be better to put them in a pasta salad where the vinegar flavor would be welcomed, rather than on a pizza where the flavor might not.
~sd