The Gammex CTDI 3-Piece Phantom easily measures absorbed dose and monitors scanner output faster and more easily than ever before. The tongue and groove design provides precise, fast module and insert placement. The 3-pieces can be used together to simulate adult head and body, or the 2 inner pieces can be used to simulate pediatric head and body. Includes a custom water-tight, hard case, and wedges for stabilizing the phantom on the couch. This product includes a 5-year warranty.