Can anyone explain collimation versus slice thickness in the context of imaging lung nodules on CT?

I'm a medical student and don't have much physics background at this point, so a simplified explanation would be very helpful. I'm trying to understand what "1-2mm collimation" means in the context of imaging lung nodules. I'm assuming it's not the same as slice thickness otherwise they would have written it? However the main textbook I'm using doesn't explain it, and the things I found on google are quite technical and/or vague. Thanks.

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