Like a Jaszczak Phantom, this comes with a cold rod insert and solid spheres. But the lid is different. It has a number of individually fillable cylindrical chambers of various sizes. These can be filled with air, water, or higher concentrations of activity. There is also a solid PTFE cylinder.
The Flangeless Esser PET Phantom is used for system performance evaluation, acceptance testing, and routine quality assurance (QA). The product is a variation of the Jaszczak Phantom designed for clinical QA of PET systems.