collimation
C2CEFR level
95/100Rarity: very rare
TechnicalRegister
The restriction of the X-ray beam to the area of interest to reduce dose and scatter.
Tight collimation to the wrist kept the dose to surrounding tissue as low as possible.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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