Equipment Artifact - Video Lesson

Welcome back. This CT artifact lesson is about equipment induced artifact in CT. There's actually several different equipment failures that can cause artifact. The artifacts that we'll be talking about are ring artifact, aliasing artifact, and cone beam artifact. The image that you see on the left is actually an example of what we call ring artifact. It's called ring artifact because it looks like a ring or circle on the image. It's caused by detector failure or some other issue related to one of the detector elements in the detector array, like mis calibration or even contrast on detector or contrast on the mylar window, can cause ring artifact. In any of those situations, basically what's happening is a single detector or a group of detectors is not producing signal like the computer is expecting, and this results in the appearance of a ring. The reason it looks like a ring on the images