Which size of image intensifier is likely to produce the most image distortion?

The correct choice indicates that the 15-inch image intensifier is likely to produce the most image distortion. This can be attributed to the geometric properties and design of larger image intensifiers.

In fluoroscopy, larger image intensifiers, like a 15-inch model, often encompass a broader field of view, which can lead to greater magnification effects at the periphery of the image. This magnification can cause distortion due to the curvature of the intensifier, especially at edges, where the image may be warped more compared to areas towards the center. The increasing diameter can exaggerate this effect because light rays diverging from the edges have a longer path to travel, resulting in a distortion of the shapes and spatial relationships of objects imaged.

Smaller image intensifiers, such as the 6-inch or 9-inch models, typically exhibit less distortion as they may not have to handle as much peripheral data. The distortion is inherently minimized due to the shorter distance from the source of the x-rays to the intensifier and the more direct path the light travels. Therefore, the 15-inch intensifier, while beneficial for viewing larger anatomical areas, introduces more potential for image distortion compared to its smaller counterparts.