The CESM Phantom by Sun Nuclear is designed for quality control of contrast-enhanced spectral mammography systems. It features two sets of five plugs embedded in a slab with varying iodine concentrations (0.2–2.0 mg/cm²) and glandular-equivalent material to simulate lesions. The phantom's layered structure includes 100% adipose and glandular materials for testing iodine separation across different tissue densities. With realistic breast-mimicking design and dimensions of 180 x 127 x 100 mm, it ensures reliable and comprehensive imaging assessment.