Replacement CT Tubes

We use them, we abuse them and we expect them to work 24×7. Yet the workhorse of radiation imaging — the X-ray tube — is a mere fragile descendent of the electron tube Roentgen used in 1895.

Tubes used for CT (computerized tomography) are similar to conventional X-ray tubes. A glass or metal insert under vacuum is contained within a lead-lined housing. X-rays are created by boiling electrons off tungsten filaments and accelerating them towards a rotating anode (usually made of RTM (Rhenium Tungsten Moly) alloy. The RTM is welded to a block of copper which is cooled by forced air or water. The electron beam is focused on a very small target called the focal spot.

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