Dropout bands caused by annular ring malfunction can appear at a depth.

Dropout bands caused by annular ring malfunction can appear at a depth.

• A. A dropout band at a depth
• B. Across all depths
• C. A cross-hatch band
• D. No dropout

Answer: (A)

Dropout bands from an annular ring malfunction arise from a localized, fixed defect in the imaging system. Because the fault sits in a specific region of the detector or transducer, the corrupted signal maps to a particular depth plane when the image is reconstructed. In depth-resolved imaging, that means you’ll see a dropout band at that specific depth, not across every depth. The artifact isn’t a grid-like (cross-hatch) pattern, and it isn’t spread through all depths, since the defect’s influence is tied to one depth corresponding to where the faulty ring projects.

Dropout bands from an annular ring malfunction arise from a localized, fixed defect in the imaging system. Because the fault sits in a specific region of the detector or transducer, the corrupted signal maps to a particular depth plane when the image is reconstructed. In depth-resolved imaging, that means you’ll see a dropout band at that specific depth, not across every depth. The artifact isn’t a grid-like (cross-hatch) pattern, and it isn’t spread through all depths, since the defect’s influence is tied to one depth corresponding to where the faulty ring projects.