An add-on of new high-energy Clinac iX accelerator capabilities to existing systems that meet these requirements:

• Clinac iX, all serial numbers. • Trilogy configuration, all serial numbers. • Low-energy Clinacs, serial number 244 and higher. • Clinac 21 series, serial number 865 and higher. • Clinac 23 series, serial number 144 and higher. • Silhouette edition Clinacs, all serial numbers. Beam energy can also match electron beam energy, photon X-ray beam energy, and photon X-ray beam flatness.