The phantom is made from proprietary epoxy formulations that faithfully mimic the X-ray absorption and scatter properties of soft tissue or water within 1% in the diagnostic energy range. Each abdominal CT dose phantom includes an embedded vertebral bone equivalent rod that is specifically formulated to mimic the appropriate density for patient size/age. The thorax CT dose phantoms include vertebral bone equivalent rod and lungs. The head CT dose phantoms are wrapped around with bone equivalent layer to represent cranium bone formulated for appropriate patient size / age. All the phantoms have five through-holes with an inside diameter of 1.30 cm to accommodate standard CT dose probes and five tissue equivalent rods to plug the holes not in use. One hole is at center and four are around the perimeter, 90° apart and 1 cm from center to the outside edge of the phantom. There are eight abdominal, eight thorax, and four head phantoms of different sizes/ages available, as well as one CT Imaging QA Kit.