Imaging system phantom

A method for calibrating an imaging system, comprising:

• positioning a phantom in a bore of the imaging system by moving a table of the imaging system, the phantom positioned at the front of the table via a plug of the phantom inserted into an accessory slot of the table, the phantom including a main body coupled to the plug, the main body including a base comprised of a first material and a plurality of layers positioned on the base, each layer of the plurality of layers comprised of the first material or one or more additional materials;
• and
• scanning a first vertical stack of the main body, the first vertical stack including at least the base and a first layer of the plurality of layers.