iaea human health series publications - SEDIM

FIG. 8. The image on the left demonstrates an odd looking, well defined artefact that, when electronically zoomed in on, looks like astep wedge embedded in the breast. The direct cause of the artefact is a failure of image acquisition electronics. In this case, thefundamental cause was a failure of the room air conditioning, which allowed the temperature at the detector to exceed the allowedtolerance.FIG. 9. An obvious example of an image acquisition electronics failure in an a-Se detector. Fortunately, in this instance it occurrednear the nipple edge and not the chest wall, and thus the images of this patient did not require repeating.31