DSA’s requirements for X-ray tubes require that the line tube must have a large capacity and the anode heat capacity must be high. DSA's continuous perspective and exposure collection not only requires the line tube to have a large output power, but also requires its anode heat capacity to be large. For medium and large DSA equipment, the general linear heat capacity should be between 1 and 2 MHU. Metal-ceramic tube shells and liquid metal bearings are mostly used to rotate the anode X-ray tube at a high speed, and the speed can reach 9000r/min.