FID stands for Focus-to-Image Receptor Distance. It refers to the distance from the X-ray tube's focal spot (focus) to the detection surface of the imaging device (image receptor).
In modern X-ray inspection systems, Flat Panel Detectors (FPD) are typically used as image receptors to enable real-time, high-resolution imaging. In the context of industrial X-ray CT scanners and radiography, this parameter is synonymous with SID (Source-to-Image Distance).
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