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Build on the video with explanations and short checks.
Exam category: Image Production → Equipment Operation & QA
Why it matters: Every exposure you make is produced in the x-ray tube, and its design sets limits you work within: the focal spot sizes you can choose, how much heat one exposure can safely add, and how long the anode must cool before the next exposure. The registry tests what each part of the tube does, from the electron source to the target, the rotating anode's motor, and filtration.
Diagram: the interactive x-ray tube diagram is live on StudyBucky.
An x-ray tube is a vacuum-sealed glass or metal enclosure with two electrodes: a cathode (negative) that supplies electrons, and an anode (positive) that the electrons slam into. Almost all of that collision energy — more than 99% — becomes heat, not x-rays. Everything about tube design is really solving one problem: how do you concentrate electrons onto a tiny spot (for a sharp image) without melting the equipment?
The cathode has two parts:
Most tubes have two filaments, side by side, giving a large and small focal spot. Only one is energized per exposure.
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Electrons leaving the filament repel each other and would spread out on the way to the anode. What keeps them in a tight beam aimed at the target?
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