Transmission X-ray Tubes

The beam head of the transmission tube contains a disc shaped target onto which an extremely thin layer of Tungsten is applied. This layer can be between 1 and 10µm thick. Other materials can also be used for special applications. The transmission target in the beam head is bombarded with a focussed electron beam. The size of this focal point or spot, determines the blurring or unsharpness of the X-ray image. For high resolution images the smallest focal spot achievable is preferred.