Evaluating the visibility of stationary and moving objects is a requirement in Flat
Panel Detector (FPD) systems, especially with fluoroscopy. One undesired phenomenon
with dynamic fluoroscopic images is the potential artifact caused by image lag in
the detector. Image lag is a delay known to degrade image quality. Therefore, it is
an important factor in dynamic fluoroscopy. However, it is not routinely checked.
Commercial phantoms by NEMA and LEEDS offer the use of rotatable objects to assess
lag. Although these phantoms are designed for Image Intensifier (II) systems instead
of FPD systems.
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