If one ring malfunctions, which portion of the image is lost?

If one ring malfunctions, which portion of the image is lost?

• A. The entire image is lost
• B. No effect
• C. Only a portion of the image is lost
• D. A diagonal artifact appears

Answer: (C)

A single malfunctioning ring affects only the data from that ring in the detector array. In ring-based imaging systems, projections are gathered around the circular geometry, so when one ring fails, the corrupted data shows up as a ring-shaped artifact around the image center. This confines the problem to a specific area, meaning only a portion of the image is affected rather than the entire image. A diagonal artifact would come from different issues like patient motion or timing errors, not a single ring fault. So the best choice is that only a portion of the image is lost.

A single malfunctioning ring affects only the data from that ring in the detector array. In ring-based imaging systems, projections are gathered around the circular geometry, so when one ring fails, the corrupted data shows up as a ring-shaped artifact around the image center. This confines the problem to a specific area, meaning only a portion of the image is affected rather than the entire image. A diagonal artifact would come from different issues like patient motion or timing errors, not a single ring fault. So the best choice is that only a portion of the image is lost.