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The difference between SID and FID of collimator

What exactly are the SID and FID of the X-ray collimator? Let me briefly introduce it.
SID (Source Image Distance) refers to the distance from the X-ray focus to the skin, usually measured in feet or meters. In simple terms, we call it the focal skin distance.
FID (Focus Image Distance) refers to the distance from the X-ray focus to the screen/film (imaging component). In simple terms, we call it focal screen distance or focal film distance.
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X-ray-collimator

Author:X Ray Collimator


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