For under-table tubes, what is the required distance from the image intensifier to the tabletop?

The correct distance from the image intensifier to the tabletop for under-table tubes is 14 inches. This specification is important for maintaining optimal image quality and ensuring adequate exposure. The image intensifier's position relative to the tabletop affects the geometry of the X-ray beam and the resultant image quality during fluoroscopy procedures.

A distance of 14 inches is established to provide a balance between maintaining image clarity while minimizing patient exposure to radiation. This standard is supported by guidelines and regulations aimed at ensuring safety and effectiveness in radiologic practices.

Other distances, such as 10, 12, or 16 inches, would not provide the same level of image quality or may either increase unnecessary radiation exposure or diminish the clarity required for diagnostic accuracy. Adhering to the specified 14 inches helps to align with the accepted protocols in fluoroscopic imaging.