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The beam limiting device in dental radiology is generally an (sometimes interchangeable) fixed-geometry metal cone or cylinder (German: Tubus) [attached to the beam port of the x-ray tube housing] which also serves as a spacer to establish an appropriate focus-skin distance and focus-film distance; and as a general direction guide to facilitate proper beam angulation and alignment.
Long cones ensure a relatively long (safer) focus-skin distance, and are the hardware ingredient in _long-cone technique_ which is just that. (Short focus-skin distances disproportionately increase the skin dose o the patient.)
30 years experience in medical radiology
Tom Funke Local time: 08:15 Native speaker of: English PRO pts in pair: 2419